. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. or with tubercles or spines. Living species (marine) commonly adhering to algae. Spirorbis angulatus. Hall. (Fig. 30.) (15th Rep't X. Y. State Mas. Nat. Hist., p. 84.) Distinguishing Characters.—Two or more volutions, outer one robust; sub- angular sides: upper angular surface sometimes nodose; aperture round or spirvrbuanguto- in i t .i tits. Attached to ;i sliell of oval, usually nearly rectangular to the Athyris spin/eroides. Nat- , . ural size and enlarged. plane OI VOllltlO
. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. or with tubercles or spines. Living species (marine) commonly adhering to algae. Spirorbis angulatus. Hall. (Fig. 30.) (15th Rep't X. Y. State Mas. Nat. Hist., p. 84.) Distinguishing Characters.—Two or more volutions, outer one robust; sub- angular sides: upper angular surface sometimes nodose; aperture round or spirvrbuanguto- in i t .i tits. Attached to ;i sliell of oval, usually nearly rectangular to the Athyris spin/eroides. Nat- , . ural size and enlarged. plane OI VOllltlOn. (Original.) Found in the Demissa bed, and occasionally in the shales below, at Sections 5 to 8, and on the Lake Shore (rather rare). Genus ADTODETUS. Lindstrom. (1884: On the Silurian Gastropoda and Pteropoda of Gotland, p. 185.) Tube a sinistral (left-handed) coil, somewhat resembling a gastropod shell. The form is that of a truncated cone, whose exterior is smooth, seldom showing any traces of the internal coil, though covered with a fine nndulose and some- times rugose concentric striation. The apical extremity is flattened into a broad cicatrix of attachment, which some- times has one-half the width of the body-whorl. Usually attached to a brachiopod shell. Walls of the tube thick, somewhat cellular in the thickest portions. A U T O I) E T D S LINDSTRCEMI. Clarke. (Fig. 31.) (Am. GeoL, Vol. XIII., p. 334, Figs. 1,2, 3, May, 1894.) Distinguishing Characters. — Rapid expansion of shell; cica- trix of attachment less than one- third the diameter of the body- whorl. Found in the Hamilton shales, at Hamburgh, X. Y. Fig. 31. Autodetus lindstroemi. Lateral anil top view, and section. (Clarke. ) x 3 (after Clarke;.. 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 of Natural Sciences. Buffa
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