155 
PRODUCTUS Flemingii. 
TAB, LXVIII.—Fig. 2. 
Spec. Cuar. Ears small; shell nearly twice as 
broad as long; the sides of the convex valve | 
gibbous; the front indented, longitudinally 
furrowed ; a few short spines on the sides. 
EEE EE 
Hiner straight, in length about two-thirds the width of 
the shell; there are several concentric wrinkles extending 
over the ears, which are not very prominent; no:lines of 
growth visible. The spines are tubular, as in others of the 
Genus, some are closed at their extremities, others open, 
perhaps broken. Length half an inch. 
From the same place and by the same favour as the last ; 
a specimen of the deep valve only, with some ferruginous 
earth in it, but which allows the inside of the shell to show 
the perforations. I believe that the deep shell may be 
enough to distinguish species by, but experience may 
hereafter determine it better. I take upon me to honour it 
with the name of the discoverer, whose merits and kindness 
I shall be glad to hand down to posterity. 
PRODUCTUS spinulosus. 
TAB. LXVIII.—Fig. 3. 
Spec. Cuar. Semicircular, flattish; hinge long 
and straight; convex valve gibbous towards 
the beak, with many small spines spread over 
it; ears obscure; the other valve also spinous 
and very concave. 
Sa 
Tue spines are short, numerous, and arranged in quincunx 
order; besides these the surface is covered with longitudinal 
