121 
NAUTILUS. 
14. Nautilus semilituus. Curved Nautilus. 
Montagu , pi. 19. f. 3. 
Shell opake, brown ; the six upper joints a little curved, 
and each of them separated by a straight raised line ; the 
lower-one3 curling inwards, or sometimes nearly straight; 
the back margin with raised ridges at the division of the 
joints: aperture a little contracted and rounded, with a 
small syphon which is placed nearly in a line with the 
outer margin: minute. 
Inline sand. v. m. 
15. Nautilus subarcuatulus. Hooked Nautilus. 
Montagu , pi. 19. f. \—Walker, f. 73. 
Shell white, glossy, semitransparent, with twelve joints ; 
tbefouror five primary ones nearly straight, and separated 
ty oblique raised and more opake lines ; the rest curling 
spirally inwards, and divided by radiating lines; the back 
margin furnished with a raised ridge, and slightly indented 
by the divisions of the joints; the front margin obtusely 
rounded: aperture oblique, with a small syphon at the up- 
pi r point : length the eighth of an inch. 
Mr. Dillwyn, misled by Maton and Rackett, has united 
these two last very distinct species, omitting Montagu’s 
figure of the first. 
In fine sand. v. v. 
16. Nautilus Legumen. Pod Nautilus. 
Montagu , pi. 19. f. 6. 
Shell white, smooth, glossy, transparent, somewhat flat¬ 
tened, a little concave on one side, without marginal ridge 
on either side, a little curved, slightly tapering or nearly of 
equal diameter at both ends, the extremities of which are 
a little rounded and contracted : joints eight or nine, divi¬ 
ded by oblique lines •, the anterior or larger end oblique and 
margined, with an obtuse syphon which rises above the 
margin, and a considerable aperture near the concave side: 
length above the eighth of an inch. 
h fine sand. v. m. 
jJ. Nautilus rectus. Straight Nautilus. 
Montagu, pi. 19. f. 4, and 7— Walker , f. 74. 
Shell brown, opake, thick, smooth, a little curved and 
m something 
