Lorraine Faunas of New York and Quebec 291 
hinge-line is straight for a distance of at least 37 mm. from the 
beak, and possibly farther, rounding into the posterior margin of 
the shell. The latter is rounded. The basal margin is straight 
as far as a point directly beneath the beak, thence it curves upward 
toward the anterior margin which is most convex near its junction 
with the anterior part of the cardinal outline of the shell. The 
shell enlarges only moderately posteriorly, the basal margin being 
subparallel to the hinge-line. Umbonal ridge weakly defined 
even within 15 mm. of the beak, and rounding posteriorly into the 
general convexity of the shell. Concentric striae most distinct 
along the anterior parts of the shell, and also along the base; less 
conspicuous along the posterior border; and rather indistinct 
along the umbonal ridge and over most of the post-umbonal slope. 
Length 70 or 71 mm., greatest height posteriorly 22 mm., 
height at beak 16 mm., extension of shell anterior to beak esti- 
mated at 12 mm., convexity of the single valve about 4 mm. 
Locality. Type, collected on the Riviere des Hurons, near St. 
Jean Baptiste, October, 1872, by Thomas Curry. Preserved in 
the Victoria Memorial Museum, by the Geological Survey of 
Canada, at Ottawa, Canada. No. 8422. 
26. Cymatonota pholadis, Conrad 
{Plate III, Fig. 7) 
In the Second Annual Report of the New York Geological Survey, 
in 1838, Conrad described this species as follows: 
Shell profoundly elongated, ventricose; dorsal and basal margins 
parallel ; posterior sides rugose, or with short undulations near the dorsal 
margin. Length, If inches. 
In describing the next species (ilfodfoZopsfs modiolaris) , he gives 
the locality for that species as “Pulaski, Oswego county, with the 
preceding.’’ From this it is evident that the type locality for 
Cymatonota pholadis is Pulaski. 
In the Paleontology of New York, vol. i, on plate 82, Fig. 6 was 
published by Hall from a drawing prepared by Conrad, and 
therefore authentic. Hall states that Cymatonota pholadis re- 
sembles a new species, Cymatonota parallela, occurring “in the soft 
shaly portions of the group at Pulaski, Loraine, and other places. 
