225 



with from four to seven longitudinal ribs; aperture 

 extended in a conic central syphon, i. Sandwich, 

 allied to Nautilus Raphanus of Linnoem. 



O. JUGOSA. F. p. 236. NAUTILUS J. Mont. p. 

 198. t. 14./. b.Turt.D.p. 123 Lin T. 8. p. 119. 



An. N. OBLIQUUS. 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, tyc. in fine sand. 



0. BICARINATA. F. p. 237. NAUTILUS B. Mont. 

 Sup. p. 86. Turt: D. p. 123. D.^.349. Somewhat 

 cylindrical, curved, tapering a little to a rounded point ; 

 joints eleven, rather globular with two slight longitudinal 

 ribs, one along the arc, the other on the opposite side ; 

 the larger end terminating in a produced syphon. I. 

 In fine sand. 



O. LINEARIS. F.p. 237. NAUTILUS L. Mont. Sup. 

 p. 87. t. 30. /. 9. Turt. D. p. 123. D. p. 351. 

 DENTALINA L. Maca. p. 40. Glossy white, transpa- 

 rent, smooth, a little flattened, linear, quite straight, of 

 nearly equal size throughout or slightly tapering, 

 K 3, 



