Fossils inmtiened on page 27 of this volume. 

 BY PR0FES80E JAMES HALL. 



VENUS MEEOENAEIA. 



THE COMMON OLAM. 



This is clearly the common clam sold in our markets: the cast gives the 

 characters of the recent shell in the most perfect degree ; even the subordi- 

 nate or second muscular impressions are seen above the principal ones, — 

 marked in the drawings, a. a. 



BUOOINUM OBSOLETUM. 



NASSA OBSOLITA, SAY. 



This little shell is abundant everywhere on the coast, living more com- 

 monly on the muddy flats of the bays and creeks, pi-eferring, apparently, 

 situations sheltered from the surf of the open sea. It is known from Florida 

 to Maine. 



