CLINTON GROUP. 
85 
Position and locality. In the upper green shale of the group at Rochester, and in the same 
position at Sodus ; also in the shale beneath the ore bed in Wolcott. ( state Collection.) 
475. 6. TELLINOMYA LATA. 
Pl. XXVII. Fig. 7. 
Ovate ; anterior extremity broadest, short and rounded, narrowing somewhat abruptly from 
the beak to the posterior extremity, which is acutely rounded ; beak scarcely elevated above 
the cardinal line ; surface marked with fine, scarcely elevated concentric striae. 
This shell has the general appearance of the succeeding species, but it is proportionally much 
broader, and more abruptly narrowed towards the posterior extremity. 
Position and locality. This species has been found only in the shale beneath the ore bed 
in Wolcott, Wayne county. 
476. 7. TELLINOMYA MACELERIFORMIS. 
Pl. XXVII. Fig. 8 a, b, c, d, and 9. 
Nucula machariformis. Hall, Geol. Rep. 4th Dist. N. York, 1843, pag. 76, fig. 2. 
Shell oval-ovate, much elongated ; anterior side short, rounded ; posterior side very much 
extended, and gradually narrowed towards the extremity ; beak scarcely prominent; cardinal 
line extending about two-thirds the length of the shell ; length nearly twice and a half the 
height; surface marked by fine equal concentric striae, which are scarcely visible to the naked 
eye. 
Fig. 8 a. The left valve of an individual of ordinary size. 
Fig. 8 b. The right valve of a large individual. 
Fig. 8 c. The right valve of a smaller individual. 
Fig. 8 d. A small portion of the surface much enlarged, showing the concentric striae. 
These specimens are all of entire individuals, having the valves closely compressed. 
Fig. 9 (Cypricardia angusta, Geol. Rep. 4th District, pag. 76, fig. 6). This fossil appears to be 
identical in its surface markings and general character with the preceding. The ex¬ 
treme narrowness of the valves appears to have been produced by pressure, which 
has otherwise left the shell uninjured. 
This is the most abundant species of bivalve shell in the group ; and it will be readily re¬ 
cognized by its elongated form, and proportionally short anterior extremity. It is extremely 
thin and delicate, having suffered more from pressure than any other species. The shell is 
rarely preserved in a perfect condition ; and the specimens figured, though having both valves 
united, scarcely retain any marks of the striae, though the substance of the shell still remains. 
