and Shells of Massachusetts Bay. 109 
Long. fifteen twentieths, diam. of last whorl nine twen- 
tieths, of an inch. 
Hab. deep waters of Mass. Bay. 
My own collection. 
Cabinet of Bost. Soc. of Nat. Hist., and those of 
John C. Jay, M. D., N. Y., and A. A. Gould, M. D., 
Boston. 
Description. Shell ovate, acutely turreted ; spire 
elongated ; whorls six, the lowest ventricose and larger 
(longer) than all the rest together, having four or five 
and sometimes even six, revolving, prominent, rounded 
coste, with intervening strie ; the largest of these coste 
borders the superior portion of the whorls, forming dis- 
tinct angulations ; numerous fine longitudinal striz, not 
interrupted by the ribs, cover the whole shell; color a 
dull yellowish or brownish white; aperture oblong-oval ; 
narrowed and slightly channeled at the base; lip con- 
tinuous at its superior extremity, and distinctly indent- 
ed by the costa ; columella whitish, arcuated, with a 
slight projection near its, lower third, and abruptly com- 
pressed near its base, which inclines to the right, and 
forms a sharp angle with the outer lip ; umbilicus slight, 
and bordered externally by a strongly marked imbricated 
ridge. Interior a ight brown. Epidermis a dirty whit- 
ish yellow, thick, and foliated or laminated by its suc- 
cessive growth, which traversing the coste, gives the 
shell quite a clathrate appearance. At each stage of 
increment, the epidermis is produced upon the coste into 
two or three, stiff, corneous filaments or bristles, which, 
when the shell is wet, cause it to appear covered with 
short hairs; the same sete are apparent, though less 
conspicuous, upon the ridge bounding the umbilicus. 
Observations. The genus Trichotropis was pro- 
