244 
the others but ascends and forms the outline of the shell 
into a truncated cone, with the mouth at the top subla- 
teral. The groove and central cavity are in this state 
less distinct, the latter generally obliterated. Rare. 
In deep water. 
VERMILIA SERRULATA. Flem. in Edin. Phil. J. 
vol. 12.—Serpu.a. 8. Fl. in Ed. Ency. 7. p. 67. t. 
204. f. 8. Translucent, triangular, with a serrated 
dorsal ridge; lid single, concave, with a smooth 
margin. 
Batanus Crancuit. Leach. Ene, Brit Sup. 
Depressed, conical, very spreading at the base; valves 
darker or paler purple, crowded with coarse raised 
radiating striz; aperture very small in proportion ; 
walls at the base, cellular. Diam. J. Rare. Tenby. 
Mactra Exxuiptica. Brown, Ill.—Korbes Mal. 
Mon. p. 48.—Macg. Aber. p. 289. Subelliptical. 
very thin, yellowish white, smoothish, somewhat glossy, 
with faint and very delicate concentric striz, rather con- 
spicuous lines of growth and slight indications of 
radiating '‘striule ; umbones prominent, pointed, recurved 
and nearly central : posterior slope convex, the anterior 
less so and forming an obtuse angle with the arched 
