22 



PRODUCTUS pimctatLis. 

 TAB. CCCXXIll. 



Spec. Char. Transversely obovate, gibbose, 

 depressed in the middle, hispid ; surface 

 composed of concentric imbricated laminae; 

 lesser valve nearly flat. 



Syn. Conch. Anomites punctatus. Marliu 

 Pet. Derb. tab. 37. /. 6, 7, and 8. 



A SHORT hinge hue, 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 lamince 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- 

 laate 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 stoncj and their small parts less distinct. 



