157 
PRODUCTUS scabriculus, 
TAB. LXIX.—Fig. 1. 
Conchiliolithus (Anomites) scabriculus. Mart. 
Petrif. Derb. Tab. 36. F. 5. — 
Spec. Cuar. Nearly round, flat valve obscurely 
punctato-striated, the other gibbous, marked 
with longitudinal striz and prominent tuber- 
cles ranged nearly in quincunx order; hinge 
straight, equa! to the breadth of the shell. 
omnia Se 
Tue sides are straightish, giving the shell a rectangular 
form, rather wider than long: the tubercles on the convex 
valve are placed on the strie, elongated, and each has a fine 
point at the end most distant from the beak. The flat valve 
has indentations like the impressions of the imperfect spines 
on the other valve, giving a concentrating reticulated ap- 
pearance. 
Mr. Martin sent me this shell many years ago from Buxton. 
It has much the character of his Conch. (Anom.) productus, 
and presuming on this general appearance, I expect most 
of the Genus, although not always found with the produced 
margin any more than his, have it when perfect. 
PRODUCTUS spinosus. 
TAB, LXIX.—Fig. 2. 
Spec. Cuar. Roundish, very gibbous, convex 
valve with many long spines, longitudinally 
striated ; hinge small. 
ee 
Tue back of this shell is rounder than the front, which 
is slightly indented in the middle; the_striz are pretty 
numerous; the spines long, cylindrical, bent towards the 
front; hinge apparently much shorter than the shell is 
wide; length rather less than the width, which is not quite 
aninch. The concave valve is destitute of spines. 
