. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. L'Sl Found"* * * in the soft Calcareous shales, on the Shore of Lake Erie, at Eighteen Mile ; (Hall.) Bellerophon leda. Hall. (Fig. 212.) (Pal. N. Y., Vol. V., Pt. II., p. 110, PI. XXIII.) Distinguishing (haracters.— Sub-globse outline, si igh 11 v flattened on back; rapidly expanding body-whorl; wide aperture; abruptly spreading peristome, broadly sinuate and notched in front; reflexed inner lip, extending- in a callus over the pre- ceding whorl; strong revolving striae
. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. L'Sl Found"* * * in the soft Calcareous shales, on the Shore of Lake Erie, at Eighteen Mile ; (Hall.) Bellerophon leda. Hall. (Fig. 212.) (Pal. N. Y., Vol. V., Pt. II., p. 110, PI. XXIII.) Distinguishing (haracters.— Sub-globse outline, si igh 11 v flattened on back; rapidly expanding body-whorl; wide aperture; abruptly spreading peristome, broadly sinuate and notched in front; reflexed inner lip, extending- in a callus over the pre- ceding whorl; strong revolving striae, alternating in size; finer, sub-equal, thread-like, cancellating, concentric fig. 212. Beiierophon ie<ia „ t T,, (after Hall). stria?; narrow, flattened, or slightly concave revolving band, usually marked by several fine revolving stria?. Found in the shales below the Trilobite beds, and in the Pleurodictyum beds (rare); Strophalosia bed, in Avery's Creek, and on the Lake Shore (common, though usually com- pressed ); also in the Transition shales, twenty feet below the Strophalosia bed, in Erie Cliff (rare).. Class Pteropoda. Cuviek. The pteropods, or sea butterflies, are pelagic auimals, often found in vast numbers swim- ming near the surface of the water after dark. Though frequently naked, a large number bear more or less transparent shells, which are very variable in outline. The shells are often found in vast quantities on the ocean floor, constituting '' pteropod ; The head of the pteropod is indistinctly defined, the eyes are rudimentary, and the foot is represented by two lateral fin-like or wing-like appendages, near the head; the body is straight or variously inrolled. Fig. 213 shows a modern pteropod with Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buffalo Society o
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