NAUTILUS. 123 
ribs, and the extremities like the last variety. Montagu, 
Suppl p. 84. 
In fine sand. v. wi. 
21. Nautilus jugosus. Jointed Nautilus. 
Montagu, pi. 14. f. 4. 
Shell opake, brown, tapering-, nearly cylindrical, very 
slightly curved, with nine somewhat globular joints mark¬ 
ed with numerous longitudinal ribs ; the terminal joint of 
the smaller end produced and longer than those which are 
near it: aperture produced to a conic syphon: length the 
eighth of an inch. 
In fine sand. v. m. 
22. Nautilus spinulosus. Prickly Nautilus . 
Montagu, pi. 19. f. 5. 
Shell pale chesnut, with three very globular joints, co¬ 
vered with spines which all incline to the posterior end , 
the upper bulb a little elongated to form a syphon : length 
the tenth of an inch. 
Variety. Slightly curved and taper, with eight not so 
much inflated joints, and covered with tubercles rather than 
spines. Montagu , Suppl . p. 86 . 
In fine sand. 
23. Nautilus bicarinatus. Double-ribbed Nautilus . 
Montagu, Suppl . p. 86 . 
Shell somewhat cylindrical, curved, tapering a little to a 
rounded point: joints eleven, rather globular, with two 
| slight longitudinal ribs, one along the arc, and another on 
• the opposite side 5 the larger end terminating in a produ- 
' ced syphon: length the eighth of an inch. 
, In fine sand. u. tti. 
24. Nautilus linearis. Linear Nautilus . 
Montagu , pi. 30. f. 9. 
Shell glossy-white, transparent, smooth, a little naU 
tened, linear, quite straight, of nearly equal size through-, 
out or slightly tapering; furnished with faint and rather ob¬ 
lique ribs at the narrower end only, which disappear about 
half way up: joints about fourteen, a little obliquely di- 
M 2 vided. 
