88 Couthouy' s New Species of Mollusca 
taken from the entrails of fishes caught in the vicinity of 
Cohasset rocks. Des Hayes, in his continuation of 
Lamarck, places it at the end of his Fissurelle, with the 
remark, that it will probably hereafter serve as the type 
for the genus Rimula of Defrance, which is based upon 
a fossil species. I have therefore decided on so placing 
it, and restoring the specific name originally bestowed 
upon it by Linneus, instead of adopting the nomencla- 
ture of Brown, who, not content with instituting a new 
genus for it, has also affixed a specific appellation of his 
own, far less deseriptive than its rightful one. 
BULLA TRITICEA. 
Plate II. Fig. 8. 
B. Testa parvulà, cylindrica, albidá, nitidà, epidermide ferruginea 
tectà; spirà depressiusculà, imperforatà ; columellà basi sinuosa, levi- 
ter reflexd, alba. 
Long. eleven fortieths, diameter three fortieths, of an 
inch. 
Habitat waters of Mass, Bay. 
My own Collection. 
Cabinets of Bost. Soc. Nat. Hist., and A. A. Gould. 
Description. Shell polished, cylindrical, rather 
solid, color a dull white, covered with a thin, shining, 
ferruginous epidermis ; spire slightly depressed, imperfo- 
rate; body traversed longitudinally and transversely by 
numerous microscopic striz ; lip inserted into, or arising 
from the spire ; aperture narrow, almost linear, except 
the base, where it is dilated to twice its previous width 
by the sudden curvature of the columella, which is white, 
and slightly reflected upon the body of the shell. 
