225 
with from four to seven longitudinal ribs; aperture 
extended in a conic central syphon. +. Sandwich, 
allied to Nautilus Raphanus of Linneus. 
O. Jucosa. F. p. 236.—Navtizus J. Mont. p. 
198. ¢. 14. f. 4.—Turt. D. p. 123 —Lin T.8. p. 119. 
—An. N. Osxriquus. Lin.?—Opaque, brown, tapering, 
subcylindrical, very slightly curved, with nine somewhat 
globular joints marked with many longitudinal ribs ; 
terminal joint of the smaller end produced and longer 
than those which are near it; aperture produced to a 
conic syphon. 0,16. Kent, Sc. in fine sand. 
O. Bicarinata. &. p. 237.—Navtitus B. Mont. 
Sup. p. 86.—Turt: D. p.123.—D. p.349.—Somewhat 
cylindrical, curved, tapering a little to a rounded point ; 
joints eleven, rather globular with two slightlongitudinal 
ribs, one along the arc, the other on the opposite side ; 
the larger end terminating in a produced syphon. 3%. 
In fine sand. 
O. Linearts. F.p. 237.—Navutiivus L. Mont. Sup. 
p. 87. t. 30. f. 9.—Turt. D. p. 123.—D. p. 351.— 
Dentatina L. Macg. p. 40.— Glossy white, transpa- 
rent, smooth, a little flattened, linear, quite straight, of 
nearly equal size throughout or slightly tapering, 
K-3 
