. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. NIAGARA FALLS AND VICINITY 219 Leperditia scalaris Jones (Fig. 150) (Grabau. Geol. soc. Am, Bui. 11:371, pi. 22) Distinguishing characters. Bean-shaped outline; straight hinge line with salient angles; uniformly curved basal margin; an- terior and posterior marginal. horders; ocular tubercle about a third the length of the shell from the anterior end; strong, elongated fold or " dorsal hump " below the hinge line, in the posterior half of the left valve. FIg'15" Leperditia scalaris (enlarged) Found
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. NIAGARA FALLS AND VICINITY 219 Leperditia scalaris Jones (Fig. 150) (Grabau. Geol. soc. Am, Bui. 11:371, pi. 22) Distinguishing characters. Bean-shaped outline; straight hinge line with salient angles; uniformly curved basal margin; an- terior and posterior marginal. horders; ocular tubercle about a third the length of the shell from the anterior end; strong, elongated fold or " dorsal hump " below the hinge line, in the posterior half of the left valve. FIg'15" Leperditia scalaris (enlarged) Found in the Manlius limestone of North Buffalo* and elsewhere In Erie county. It is a common species. Genus bollia Jones & Holl [Ety.: Boll, proper name] (1886. An. and mag. not. hist., ser. 5, 17:360) Valves oblong, with rounded and nearly equal ends; hinge line straight, ventral margin curved; surface punctate and bearing a rudely horseshoe-shaped ridge, with a central depression within, and without a semilunar ridge on each side and parallel to the outer margins of the shell, which are slightly rimmed. Bollia symmetrica (Hall) (Fig. 151). Beyrichia sym- metrica Hall. (1852. Pal. N. Y. 2 317, pi. 67) Distinguishing characters. Extremely small size; thin horseshoe ridge, dividing shell into three nearly equal parts; ridges and inter- v,_an spaces about equal; outer ridges not continued ventrally. I A Found in a fragment of weathered Rochester J shale, on the talus along the Rome, Watertown and Fig. 151 Boilia syni- Ogdensburg railroad cut above Lewiston. As- metrica natural size and enlarged sociated with the next. (One specimen found was larger than the normal, and the horseshoe curve rather thick ven- trally, but not as thick as in B. lata of the Clinton group. This -appears intermediate between the two species.) Also found at JLockport (Hall).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
Size: 1503px × 1662px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, books, booksubjectnaturalhistory
