20 
BULLETIN OF THE LABORATORIES 
surface ornamented along this marginal portion as in opposite valve, 
the remainder only by concentric stri» and folds and the pustules bear- 
ing scattered spines. Width. 38 mm., length, 34 mm., convexity of 
ventral valve, 10 mm. 
Near calcareous concretionary zone at Moot’s run. It is is pos- 
sible that this is Winchell’s P. dolorosa which we have not seen. There 
is reson to suspect that the specimens hesitatingly referred in voL iii, 
to P. lachrymosus, var. stigmarius, H. are extreme phases of the pres- 
ent species. 
PRODUCTUS NEWBERRYI, H. 
(Plate X, Figs. 24, 35.) 
A very large suite of this species from Bagdad, Weymouth, Med. 
ina, Lodi, Burbank, and Cuyahoga Falls present a close agreement 
except that the specimens from the shales are smaller and less fully 
developed. From P. semireticulatus as seen in the coal measures it 
differs constantly in the less elevated and arched ventral valve and less 
perfect development of the concentric markings. It seems to differ 
from the form identified with P. semreticulatus in central Ohio. The 
tubular spines are strong and curved, being most abundant on the ears 
of the ventral valve. 
Length of a ventral valve, 33 mm., width. 47 mm., height of 
valve, 18 mm. 
This species does not seem to descend much below 100 feet be- 
low the conglomerate. 
PRODUCTUS (NEWBERRYI, var,?) ANNOSUS. var. n. 
(Plate III, Fig. 17.) 
Shell sub-quadrate in outline, moderately convex, length some- 
what less than the width ; ventral valve moderately convex, convexity 
less than half the length, greatest about half way from the front mar- 
gin to the moderately elevated arched beak, which projects but little 
beyond the hinge ; a rather shallow, but distinct mesial sinus extends 
to near the umbo ; shell rapidly depressed toward the small upturned 
ears which are rounded slightly at the extremities ; hinge nearly as 
long as the entire width ; surface marked by varicose and rather strong 
