. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. 203 Measurements.— Large specimen: width, 11 mm.; height, 8 mm. Chonetes lepidus. Hall. (Fig. 109.) ( Pal. N. V., Vol. IV., p. 132, PL XXI.) Distinguishing Characters.— Small size; Semi-elliptical in outline; sub-hemispherical in convexity; slender, angular,. Fig. 109. Chonetes lepidus. Ventral and dorsal views of a specimen, natural size, and the former enlarged ; enlargement of interior of brachial valve, with cardinal process broken away (from Hall). bifurcating surface striae, of wh
. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. 203 Measurements.— Large specimen: width, 11 mm.; height, 8 mm. Chonetes lepidus. Hall. (Fig. 109.) ( Pal. N. V., Vol. IV., p. 132, PL XXI.) Distinguishing Characters.— Small size; Semi-elliptical in outline; sub-hemispherical in convexity; slender, angular,. Fig. 109. Chonetes lepidus. Ventral and dorsal views of a specimen, natural size, and the former enlarged ; enlargement of interior of brachial valve, with cardinal process broken away (from Hall). bifurcating surface striae, of which there are ten or twelve near the umbo, and twice as many, or more, near the front; sinus outlined by two stronger striae near the center, with finer ones between them in a depressed area; cardinal spines, sometimes as many as ten. Found in the Goniatite bed of the Naples shales, at Sec- tions 1 and 2 (rare); Styliolina band, at Section 1 (rare); lower Moscow shales, at Sections 4 and 5 (rare); Hamilton shales, everywhere associated with the preceding, but usually more abundant; also in the Transition shales, on the Lake Shore. Chonetes coronatus. (Conrad.) (Fig. 110.) (Pal. N. Y., Vol. IV., p. 133, PL XXI.) Distinguisliing Characters.—Large size; moderate convex- ity, with occasionally a shallow undefined sinus in the pedi- cle valve; numerous closely-arranged surface striae; five or six oblique tubular spines on each side of the beak; interior of the pedicle valve shows diverging dental lamellae, a narrow median ridge, and wide-spreading adductor impressions, out- side of which the shell is strongly pustulose; in the brachial valve a median ridge runs forward from the cardinal pro- Cess; the muscular impressions are faintly marked. Found in the Encrinal limestone, at Section 5; Stictopora and Demissa beds, and immediately below, at Sections 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
Size: 1730px × 1444px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectnaturalhistory, booky
