PRODUCTUS punctatus. 
TAB. CCCXXII1. 
Spec. Char. Transversely obovate, gibbose, 
depressed in the middle, hispid ; surface 
composed of concentric imbricated laminae ; 
lesser valve nearly flat. 
Syn. Conch. Anomites punctatus. Martin 
Pet . Derb. tab . 37. f. 6, 7, and 8. 
A short hinge line, and a beak not very prominent, 
give this Productus a regularly obovate outline. The 
cast appears transversely striated and minutely punc- 
tated : the striae are above a line apart, and are very 
regular : the punctums are impressed except when a 
portion of the shell remains, and then they are elevated : 
it is only when the whole thickness of the shell exists, 
that the real nature of it can be ascertained : it is then 
found to consist of laminae placed at regular distances, 
and pressed close upon each other : the surface is hispid, 
but the bristles appear to be very short. 
This is found in the Mountain Limestone of Derby- 
shire, and often contains Bitumen, crystals of Carbo- 
nate of Lime, &c. My good friend, S. Wright, Esq. 
of Cork, has sent me specimens from the Black Rock 
in his county, where they are in common with other 
fossils much distorted, as if they had been, along with 
the stone, reduced to a soft state and then bent about : 
in this rock, too, the shells are more incorporated with 
the stone, and their small parts less distinct. 
