io6 



NEW YORK STATE MUSEUM 



ures apparent that would distinguish the form from Solenomya, 

 we have, for the present, left the species with that genus. If this 

 reference is correct, the species is the first representative of the 

 Solenomyidae in the Ordovicic. 



Cuneamya acutifrons Ulrich 



P1.6,fig. 15, i6 



In the olive and dark gray sandy shales of the Snake Hill a species 

 occurs which has been identified by Doctor Ulrich with a form from 

 the lower Trenton at Cincinnati, known to him since 1880 and in 

 manuscript since 1886. Doctor Ulrich's description kindly sent to 

 us at our request is as follows : 



Description. Shell exceeding medium size for the genus, moder- 

 ately convex, with the point of greatest convexity near the middle; 

 outline transversely elongate, subovate or subrhomboidal, prowlike 



Fig. 30. Cuneamya acutifrons Ulrich. 



i 

 Holotype. Natural size. 



in front, highest in posterior half, narrowing anteriorly to the 

 sharply produced antero-dorsal extremity ; umbones large, promi- 

 nent, the beaks strongly incurved and situated well forward ; antero- 

 dorsal edge subparallel with, but appreciably lower than, the hinge 

 line, inflected so as to form a narrow, almost linear, lunule; an- 

 terior margin trending backward from the sharp dorsal extremity 

 in a gently sigmoid curve to the ventral side; ventral edge nearly 

 straight, with a barely suggested sinuosity in front of the middle; 

 posterior margin somewhat truncated, moderately oblique, sharply 

 rounded where it joins the dorsal line and more broadly curved in 

 the lower third ; dorsal edge nearly straight, the part visible in a 

 side view behind the umbones equaling in length about one-third, the 

 whole to the apices of the beaks rather more than one-half, of the 

 greatest length of the valves ; escutcheon very narrow and shallow. 

 Posterior umbonal ridge prominent, rounded, with the slope to the 

 cardinal margin rapid and slightly concave. Two undefined furrows 



