the aiigiilatcd lines at the upper e(lo;e of the vohitions are 

 fasciculated and of the same coloiu* of the bauds. 



OBSERVATIONS. 



We are far from being certain that this is absolutely the 

 literata of Lamarck, although it agrees perfectly, except 

 in being smaller, with the figures above quoted, to which 

 he refers. He supposed his specimens to be natives of the 

 East Indies. However this may be, and although we for- 

 merly described it under another name, we think it more 

 prudent to consider it as indicated by Lamarck's descrip- 

 tion and the figures of the Encyc. Methodique. 



It is rather common on our southern coast. 



REFERENCE TO THE PLATE. 



The figures represent the sliell in two positions. 

 PLATE III. 



