34 
BULLETIN OF THE LABORATORIES 
Productiis {Pi'oductella) lachryinosus. var. sti£m,ariiis , 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 striae. Prof. Hall suspected that 
this large form would prove distinct from P. lachrymosus, in which 
we concur. 
Productivs {Prod.uctella) 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. 
Prodiictus gracilis. Win. 
(Plate VII, 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, triangTar 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-line .29 in., length from beak to anterior 
margin, .21.” 
Our form is nearly as large again and has the Tinge line shorter 
