85 
PRODUCT A fimbriata; 
TAB. CCCCLIX.*-^ 1. 
Spec. Char. Hemispherical, with 6 or 8 trails-^ 
verse, crenated, spinous? furrows; beak 
rather produced. 
Somewhat resembling Producta punctata t. 323, but the 
furrows are more distant, and are crossed by ridges that 
seem to have been the bases of spines, arranged in the 
form of a fringe ; the length is greater than the width, 
and about double the depth ; the lesser valve is concave, 
with sharper and more numerous, but otherways similar 
markings, to the larger. 
The specimen lined with Calcareous-spar, from the 
Limestone of Derbyshire, is preserved in the Collection 
of Charles Stokes, Esq. 
PRODUCTA plicatilis. 
TAB. CCCCLIX.-^. 2. 
Spec. Char. Transversely oblong, convex 
above, depressed in the middle, longitudi- 
nally striated and transversely wrinkled, 
spinose ; front smooth. 
The transverse rugae are numerous and equal, they only 
appear upon the upper part of each valve ; the descend- 
ing front is even and smooth ; the spines are few, 
scattered over the surface ; the hinge line occupies the 
whole width of the shell. 
A very neat well defined species rarely found in the 
Limestone of Derbyshire. We are equally obliged to 
Mr. Stokes for the opportunity of figuring this, as the 
preceding specimen. 
