414 
PALAEONTOLOGY OF NEW YORK. 
CON0CARDIUM CONCINNUM. 
PLATE LXVIII, FIGS. 26, 27. 
Conocardium conchmum, Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 68, figs. 26, 27. 
18S3. 
Shell small, ovate-cuneate, gradually attenuate anteriorly. Posterior end 
obliquely truncate along the umbonal angle. Post-cardinal slope slightly 
concave and projecting at the junction of the valves. Valves marked by 
numerous radii. Body of the shell, to near the anterior extremity, marked 
by strong sub-equal radii, as preserved in the cast of the interior. 
This species is not very different in appearance from C. attenuatim , but the 
ribs are coarser. 
Formation and localities. In the calcareous layers of the Hamilton group, at 
Pratt’s falls, Onondaga county, N. Y.; and in the arenaceous beds of the same 
group, from an unknown locality. 
Conocardium liratum. 
PLATE LXVIII, FIGS. 28, 29. 
Conocardium liratum, Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations : PL 68, figs. 28, 29. 1883. 
Shell small, trigonal; length less than twice the height. Posterior slope very 
broad, marked by about five sharp, distant, elevated plications. Anterior 
part of the body abruptly contracted and marked by about twelve or more 
finer plications. The entire surface is also marked by fine lamellose concen¬ 
tric striae. Interior unknown. 
A specimen has a length of 11 mm. and a height of 6 mm. 
In general form this species resembles C. denticulatum, but is readily distin¬ 
guished by the strong plications on the anterior portion. 
Formation and locality. In the Chemung group, Ithaca, N. Y. 
