 | Albany Institute - 1864 - 348 דפים
...consisting of two delicate riband-like lamellae, which extend about one-half the length. These lamellae at first curve gently outwards, and then approach...Near their origin, each bears upon the ventral side a single triangular crural process. Name from the Greek, Kentron, a spur. This genus is intermediate... | |
 | 1859 - 530 דפים
...consisting of two delicate riband-like lamellae, which extend about one-half the length. These lamellae at first curve gently outwards, and then approach...Near their origin each bears upon the ventral side a single triangular crural process. Name from the Greek, Kentron, a spur. This genus is intermediate... | |
 | Henry Woodward - 1881 - 634 דפים
...riband-like lamellae, which extend to about half the length of the dorsal valve. " These larnellse at first curve gently outwards, and then approach...in what appears to be a thin flat vertical plate." Now our small species does not show these characters, for in all the specimens developed by the Itev.... | |
 | New York State Museum - 1862 - 598 דפים
...consisting of two delicate riband-like lamellae, which extend about half the length. These lamellae at first curve gently outwards, and then approach...Near their origin, each bears upon the ventral side a single triangular crural process. Name from the Greek, kentron, a spur. This genus is intermediate... | |
 | Henry Woodward - 1881 - 824 דפים
...extend to about half the length of the dorsal valve. " These lamellfB at first curve gently outwai'ds, and then approach each other gradually, until at their...in what appears to be a thin flat vertical plate." Now our small species does not show these characters, for in all the specimens developed by the Rev.... | |
 | Kentucky Geological Survey, Henry Nettelroth - 1889 - 392 דפים
...extend about one-half the length of the shell. These lamellae at first curve gently outwards, and thence approach each other gradually, until at their lower...at an acute angle ; then becoming united, they are deflected backwards towards the beak, in what appears to be a thin, flat, vertical plate. Near their... | |
 | 1863 - 494 דפים
...consisting of two delicate ribbon-like lamellae, which extend about one-half the length. These lamellae at first curve gently outwards, and then approach...Near their origin, each bears upon the ventral side a single triangular crural process. Name, from the Greek ^{a spur. This genus is intermediate between... | |
 | 1863 - 962 דפים
...consisting of two delicate ribbon-like lamellae, which extend about one half the length. These lamellae at first curve gently outwards and then approach each...vertical plate. /^ Near their origin, each bears upon the ven- Id/} tral side a single triangular crural process." V / The remainder of the description com-... | |
 | 1863 - 482 דפים
...consisting of two delicate ribbon-like lamellae, which extend about one half the length. These lamellœ at first curve gently outwards and then approach each...in what appears to be a thin flat vertical plate. /O îiear their origin, each bears upon the ven- ícj) tral side a single triangular crural process."... | |
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Dorsal valve with a loop consisting of two delicate riband-like lamellae, which extend about one-half the length. These lamellae at first curve gently outwards, and then approach each other gradually, until at their lower extremities they meet at an acute... 