17 
tudinal furrow. smooth, white, frequently deeply 
grooved at the base, posterior compartments the largest 5 
aperture proportionately larger than in the last; oper- 
culum of four valves, the two upper slightly striated 
transversely, the others smooth. Diam. up to $. 
Common every where. * 
B. Rucosus. Mont. (not Lam. 23.) p. 8.—Ch. f. 
824 ?—Dor. Cat. p. 25. ¢. 2. f. 10.—Lepas R. D. 
ps 17.—Tan..T. 8.,9.25. t. 1 f.5—Tirtt fo. D. 9. 
76.—An L. Boreatts. Don. 5. t. 160 ? An B. Ovu- 
LARIS, Lam. 8 ?—Subcylindrical, usually divided into 
‘six compartments by furrows which become broad to- 
wards the top, where the shell spreads into angulated 
points andis often as wide as atthe base ; valves irregular 
the post ones broader, sometimes wrinkled or striated 
—_~ 
* B. TiInTINNABULUM. Da Cos. p. 250.—Brug. p. 
165.—Lam.3.—Mont. p. 10.—Lepas T. Lin. 13. 
—D p. 22—Turt. D. p. 75.—&e. §e.—has no just 
claim to be considered a native species, being only 
taken from the bottom of ships arriving from warmer 
climates. 
* Lepas Rapiatus. Turt. D.—Wood. G. C. t. 
7. f. 7.—cannot be considered either native or natu- 
ralized, having only been found on the bottom of a 
ship. 
