46 Mr, Marti n'j Account of ' foine Species of 



a long perpendicular flit or fent. Its greateft breadth is at the hinge, 

 from which it gradually dirniniihes to a point. 



This fpecies is very rare: I have only met with one perfect fpeci- 

 men, which was found at Caftleton, in the common, hard, grey 

 limeflone. It is a complete change, evidently retaining the exter- 

 nal fhape and markings of the original, which has been difplaced 

 by limeftone, fimilar to that in which the foflil was lodged. The 

 fame kind of ftone, alfo, and fpar blended together, conftitute 

 the interior part of the fpecimen, and fill up the aperture in the 

 front of the conical valve. 



EXPLANATION OF THE FIGURES. 



Tab. Ill 



Contains different views of the Anomia defcribed above : the figures 

 xh% exact fize of the fpecimen from which they were taken. 



Fig. I. A full view of the under or beaked valve. 



Fig. 1. Reprefents the fpecimen placed in a proper pofition for 

 ihewing the hinge, with the beak of the under valve *, and the flat 

 perforated fide of the upper or conical valve. 



Fig. 3. An oppofite view, (hewing the back of the conical valve, 

 with its deep groove or furrow, and the undulation of the margins. 

 Fig. 4. A fide view of the fame fpecimen. 



Obfervation, It feems probable that this fliell, in a recent ftate, 

 adhered by the flat perforated part of the larger valve to fome other- 

 body. I believe the few living Anomise which are known, are al- 



• : ; * It is proper to remark, that what is called the under valve forms the upper part of 

 %. 2, 3, 4. the pofition in which they are given appearing molt agreeable to the gene- 

 ral make of the (hell. 



ways 



