486 PALEONTOLOGY OF NEW YORK. 



Oneida county, N. Y. ; at the falls of the Ohio ; and at North Cayuga, Ontario ; 

 in the shales of the Hamilton group, on the shores of Erie, Seneca, Cayuga, 

 Canandaigua, Skaneateles and Owasco lakes ; and at many other localities in 

 New York, and in Hardy county, Va. 



Cypricardinia arcuata, n. sp. 



PLATE LXXIX, FIG 17. 



Ill part Cypricardinia indewla (Conrad), Hall. Pal. N. Y , vol. v, pt. 1. Plates and Explanations: 



PI. 79, figs. «-23. 1883. 



A single left valve of this species has been observed. It differs from C. 

 indenta in being more convex, and having the form and convexity of a right 

 valve. The umbonal slope is rounded, arcuate and not direct as in the other 

 species. The posterior margin is more vertically truncate, and the cincture 

 and sinuosity of the base are much more strongly marked. 



The specimen has a length of 12 mm. and a height of 7 mm. 



Other specimens are required to give a full description of the species. 



Formation and locality. In the Chemung group, north of Elmira, N. Y. 



Cypricardinia? cylindrica. 



I'LATE LXXIX, FIGS. 24, 26. 



Ogpricardiniat cylindrica. Hall and Whitfikld. Twenty-fourth Ann. Rep. N. Y. State Mus. Nat. Hist., 



p. 190. 1872. 

 " " " Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explana- 



tions : PI. 79, figs. 24, 25. 1883. 



The specimen is not accessible at the present time, and its generic relations 

 cannot be satisfactorily determined. 



Formation and locality. The original specimen was from the Hydraulic beds 

 of the age of the Hamilton group, near Louisville, Ky, 



Cypricardinia consimilis, n. sp. 



PLATE LXXIX. FIGS. 19, 20, 21 (18?); ANU PLATE XCVI, t'IG. 3 



In part Cypricardinia indenta (Cowrad), Hall. Prelim. Notice Lamellibrancliiata, 2, j>. 83. 1870. 



" " " " " Pal. N. Y., vol. V, pt. 1. Plates and Explanations; PI. 



79, figs. 6-23. 1883. 



Shell small, sub-rhomboidal ; length nearly twice the height ; basal margin 

 gently curving or nearly straight. Posterior extremity extended below. 



