34 BULLETIN OF THE LABORATORIES 



Product US { Product ella) laclirymosus. var. stiginarius, H. 



(Plate III, Fig. 28.) 



(Cf. P. curtirostra. Win.) 



A few specimens, mostly poorly preserved, from the nodules at 

 Moot's run, represent this or a closely allied species. The specimen 

 figured shows only the cast of the dorsal valve. The fine, wavy con- 

 centric striae and interrupted radiating ridges, and slight mesial sinus 

 can all be duplicated in New York specimens. 



A large ventral valve measures 40 mm. in width, 30 mm. in height, 

 and about t8 mm. in convexity of valve. There is a faint but obvi- 

 ous sinus and the surface is marked by nearly obsolete coarse ribs, as 

 well as the fine, irregular concentric stri^. Prof. Hall suspected that 

 this large form would prove distinct from P. lachrymosus, in which 

 we concur. 



Productus {Productclla) speciosus, H. ?) 



Specimens more nearly agreeing with the Chemung species than 

 those with which it is associated, have been secured. These speci- 

 mens are characterized by numerous, rather regularly arranged, small 

 pustules covering the entire surface. Moot's run, calcareous nodules. 



Productus gracilis, Win. 

 (Plate VH, Fig. 20.) No. 1347. 



The original description reads as follows: 



" Shell small, aperture of the ventral valve forming a little more 

 than a simicircle. Ventral valve moderately inflated for a Productus, 

 with flattened, smooth, triangular auriculations ; hinge-line equal to 

 greatest width of shell ; mesial sinus wanting or barely perceptible; 

 external surface marked by fine, rigid, sharp, once dichotomizing ra- 

 dial striae, numbering about 40. No indications of spines have been 

 detected. Length of hinge-Une .29 in., length from beak to anterior 

 margin, .21." 



Our form is nearly as large again and has the hinge line shorter 



