No. 109.] 177 



Productus lachrymosus. 



Pal. N.Y. Vol. iv. 

 Strophomena, lachrymosa .? Conkad : Jour. Acad. Nat. Sci. Philadelphia, 1842. 



Shell semielliptical : ventral valve moderately gibbous, flattened 

 along tlie middle ; cardinal extremities abruptly depressed and 

 flattened, ornamented with one or more rows of spines -, beak 

 elevated above the hinge-line. Surface marked by very elon- 

 gated spiniferous tubercles, which sometimes have an appearance 

 of bifurcation. 



This ig the only species known to me, which I am able to refer to the 

 description and figure of Mr. CoNRAD.*In a single well preserved speci- 

 men, the centre of the shell is moderately gibbous, a little depressed 

 in the centre, with the ears abruptly flattened, not salient, the sides 

 straight, etc. This species being from the same locality as that described 

 by Mr. Conrad, I have presumed that it may be the same, notwith- 

 standing the want of strict agreement with his figure and description. 



Geological position a7id locality. In the arenaceous shales of the Che- 

 mung group : Chemung Narrows, N.Y. 



Productus arctirostratus ( n. s.). 



Pal. N.Y. Vol. iv. 



Shell somewhat elliptical : dorsal valve deeply concave ; ears 

 broad, with a few strong concentric wrinkles, irregularly 

 marked towards the margin of the shell by strong radiating 

 striae, which are furnished with delicate spines : ventral valve 

 very gibbous or ventricose and arcuate ; beak attenuate, much 

 elevated and curved over the hinge-line j a broad, shallow 

 mesial depression extends from the most prominent part of the 

 umbo to the base ; ears abruptly separated from the body of 

 the shell, contracted and somewhat deflected. Surface marked 

 by strong radiating strise or plications, crossed by fine concentric 

 lines, and garnished as in the other valve by numerous fine 

 bristle like spines. 



[Senate No. 109.] 12 



