LAMELLIBRANCHIA TA. 
325 
concentric strife of growth, which are sometimes scarcely fasciculate on the 
lower portion of the shell. 
Hinge furnished with numerous transverse teeth, as represented in figs. 
7-9, plate xlvii. 
There is a strong vertical clavicular ridge just anterior to the beaks which 
extends for more than half the height of the shell. Anterior muscular scar 
sub-circular, distinct, situated within the cavity of the anterior end. 
Posterior scar narrow-ovate, very close to the post-cardinal margin. Umbo 
marked by three or four strong muscular pits. Pallial line distinct, distant 
from the margin of the valve. 
Four specimens measure respective^ 35, 33, 26 and 24 mm. in length and 
20, 15, 12 and 11 mm. in height. 
This species more nearly resembles N. cuneiformis than any other, but is 
readily distinguished by its shorter anterior end, wider post-cardinal slope and 
rounded umbonal ridge. It also resembles Nucula [Nuculites] ovata, Sowerby, as 
identified by Phillips, but is somewhat more elongate in form, with the post¬ 
cardinal line less oblique. 
Formation and localities. In the shales of the Hamilton group, in Schoharie 
and Otsego counties; on the shores of Skaneateles, Cayuga, Seneca and Canan¬ 
daigua lakes, and numerous localities in Western New York; also in the same 
horizon at Patterson’s creek, Ya. 
Nuculites cuneiformis. 
PLATE XLVII, FIGS, 13-10. 
Nuculit.es cuneiformis , Conrad. Geol Surv N. Y., Ann. Rep., p. 50, plate, fig - . 7. 1841. 
“ “ “ Hall. Prelim. Notice Lamellibrancliiata, 2, p. 4. 1S70. 
“ “ “ “ Pal. N. Y,, vol. v, pt. 1. Plates and Explanations : PL 47, figs. 
13-16. ISS3. 
Shell of medium size, elongate-ovate, cuneiform, widest in front and pointed 
behind; length usually more than twice the height; basal margin gently 
curving in the anterior part, becoming nearly straight behind, and abruptly 
rounded into both extremities. Posterior extremity narrow, pointed, obliquely 
42 
