157 
PRODUCTUS scabricolus. 
TAB. LXIX. — Fig. 1. 
Conchiliolithus (A nomite ) scabriculus. Mari • 
Pelrif. Derb. Tab. 36. F, 5. 
Spec. Char. Nearly round, flat valve obscurely 
punctato-striated, the other gibbous,, marked 
with longitudinal strise and prominent tuber- 
cles ranged nearly in quincunx order; hinge 
straight, equal to the breadth of the shell. 
The sides are straightish, giving the shell a rectangular 
form, rather wider than long : the tubercles on the convex 
valve are placed on the striae, 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. 
M r. 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.— 1%. 2. 
Spec. Char. Roundish,, very gibbous,, convex 
valve with many long spines, longitudinally 
striated ; hinge small . 
The back of this shell is rounder than the front, which 
is slightly indented in the middle; the striae 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 
am inch. The concave valve is destitute of spines. 
