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. L&led 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 cres- 

 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 

 flat beneath : spires three, irregular, with numerous dissi- 

 milar joints ; on the outer volution are 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 Serpulae with the Nautili. 

 C. Elongated, and more or less straight. 13 to 24. 



13. Nautilus carinatulus. Keeled Nautilus. 

 Walker, f. 72. 



Shell whitish, transparent like glass, oblong, arched at 

 the back, but very little if any thing raised into a keel- 

 like ridge : joints seven, regularly decreasing, the terminal 

 one globular : aperture linear-oval : minute. 



In fine sand. v. m. 



14, Nautilus 



