120 
NAUTILUS. 
10. Nautilus inflatus. Inflated Nautilus. 
Montagu , pi. 18. f. 3. 
Shell brown, opake, with three volutions; in the first are 
five joints which are exceedingly tumid and rounded, and 
so deeply divided as to appear like lobes; the anterior end 
or aperture somewhat globular: minute. 
In fine sand. v. m. 
11. Nautilus lobatulus. Lobed Nautilus. 
Serpula lobata. Montagu , p. 515, and Suppl. p. 160— 
Walker, f. 71. 
Shell compressed, white or yellowish, with a frosted ap¬ 
pearance when much magnified, roundish or inclining to 
oblong, convex above and flat beneath : on the first volu¬ 
tion are six or seven lobed joints, separated by faint crcs- 
cent-shaped lines ; aperture extremely small: minute. 
Attached to Zoophytes, v. m . 
12. Nautilus dissimilis. Discordant Nautilus. 
Serpula concamerata. Montagu, Suppl p. 160. 
Shell white, semitransparent, a little convex above and 
fiat beneath: spires three, irregular, with numerous dissi¬ 
milar joints ; on the outer volution arc about nine, which 
are glossy and tumid, of unequal size, but generally alter¬ 
nately a larger and a smaller one. It differs from the last 
in possessing much more numerous and infinitely more 
minute joints, which are smooth and glossy but not of that 
frosted appearance which always accompanies the last: 
minute. 
Attached to Zoophytes, v. m. 
These two last, from their being always attached and 
sessile, seem to connect the Serpuke with the Nautili. 
C. Elongated, and more or less straight. 13 to 24. 
13. Nautilus carinatulus. Keeled Nautilus. 
Walker, (. 72. 
Shell whitish, transparent like glass, oblong, arched at 
the back, but very little if any tiling raised into a keel- 
iike ridge : joints seven, regularly decreasing, the terminal 
one globular : aperture linear-oval: minute. 
In fine sand. v. in. 
14. Nautilus 
