A History of British Starfishes, and Other Animals of the Class Echinodermata, חלק 1J. Van Voorst, 1841 - 267 עמודים |
מהדורות אחרות - הצג הכל
מונחים וביטויים נפוצים
Agassiz ambulacra animal Annelides anus appearance arms arranged Asterias avenues Belfast beneath BLAINVILLE body bordered breadth Brit British BRITTLE-STAR calcareous centre characters cilia cirrhi coast colour Comatula covered creatures Cribella Crinoid Crossfish Cucumaria d'Actin deep water disk is broad dorsal dredged Echinodermata Echinus Edit extremity five FLEMING Forbes genera genus Goodsir granules Holothuria inches inter-ambulacral Ireland Irish Sea Johnston Kyles of Bute LAMARCK lateral ray-plates length Link longitudinally madreporiform tubercle margin mouth Muller naturalist oblong Ophiocoma Ophiura Ophiuridæ ovate pairs of pores papillæ Pedicellaria Pennant Pentacrinus pentactes pentangular pinnæ pinnate placed plates posterior Prod purple radiate rays reticulated round rows rubens scales SEA-CUCUMBER Sea-Urchins seen shell Shetland shores sides SIPUNCULIDE Sipunculus skin smooth Solaster Spatangus species Specific Character.-Body specimen spines spiniferous tubercles Starfishes striæ striated suckers tapering tentacula Thompson Thyone transverse triangular tubercles upper surface Uraster Urchin Wern Youghal Zool
קטעים בולטים
עמוד 137 - I expected, a luidia came up in the dredge, a most gorgeous specimen. As it does not generally break up before it is raised above the surface of the sea, cautiously and anxiously I sunk my bucket to a level with the dredge's mouth, and proceeded, in the most gentle manner, to introduce luidia to the purer element. Whether the cold air was too much for him, or the sight of the bucket too terrific, I know not, but in a moment he proceeded to dissolve his corporation, and at every mesh of the dredge...
עמוד 136 - ... arm. Next time I went to dredge on the same spot, determined not to be cheated out of a specimen in such a way a second time, I brought with me a bucket of cold fresh water, to which article Starfishes have a great antipathy. As I expected, a Luidia came up in the dredge, a most gorgeous specimen. As it does not generally break up before it is raised above the surface of the sea, cautiously and anxiously I sunk my bucket to a level with the dredge's mouth, and proceeded in the most gentle manner...
עמוד 95 - Each consists of a soft stem, bearing on its summit, or (when branched) at the point of each branch, a sort of forceps of calcareous matter not unlike a crab's claw, except that the two blades are equal and similar. When the point of a fine needle is introduced between the blades, which are for the most part open in a fresh and vigorous specimen, they instantly close and grasp it with considerable force. The particular use of these prehensile organs is not apparent; their stem, it may be remarked...
עמוד 96 - If they be parasites, to what class or order do they belong ? — what is their nature, what their food? Truly these are puzzling questions. These organs or creatures have now been known for many years — have been examined and admired by many naturalists and anatomists — have been carefully studied and accurately delineated, and yet we know not what they are.
עמוד 137 - As it does not generally break up before it is raised above the surface of the sea, cautiously and anxiously I sunk my bucket to a level with the dredge's mouth, and proceeded in the most gentle manner to introduce Luidia to the purer element. Whether the cold air was too much for him, or the sight of the bucket too terrific, I know not, but in a moment he proceeded to dissolve his corporation, and at every mesh of the dredge his fragments were seen escaping. In despair I grasped at the largest,...
עמוד xv - Among the lower and the typical orders we find this number regulating the number of parts. Every plate of the sea-urchin is built up of pentagonal particles. The skeletons of the digestive, the aquiferous, and tegumentary systems, equally present the quinary arrangement; and even the cartilaginous frame-work of the disk of every sucker is regulated by this mystic number.
עמוד xvi - ... consequence of the abortion of certain organs, or it is a variation by representation, that is to say, by the assumption of the regnant number of another class. Thus do monstrous Starfishes and Urchins often appear quadrate, and have their parts fourfold, assuming the reigning number of the Actinodermata, consistent with a law in which I put firm trust, that when parallel groups vary numerically by representation they vary by interchange of their respective numbers.
עמוד 151 - Truly the skill of the great Architect of nature is not less displayed in the construction of a sea-urchin than in the building up of a world ! " Moreover, " the calcareous covering of the sea-urchin...
עמוד 37 - The stomachs of fishes are often zoological treasuries. The haddock is a great conchologist. In his travels through the country of the mermaids, he picks up many curiosities in the shell way. Not a few rare species have been discovered by him ; and the ungrateful zoologist too frequently describes novelties, without an allusion to the original discoverer.
עמוד 96 - Those on the body and upper spines differ in shape from those on the spines immediately bordering the avenues. The former are much shorter and blunter in the blades than the latter. The calcareous forceps, of which their heads consist, are imbedded in an integument of a soft granular tissue, which envelopes the forceps when closed ; and this apparatus is mounted on a bulging body of a similar substance, which crowns the round flexible and contractile peduncle, sometimes simple, sometimes branched,...