NAUTILUS. 345 



* * Spiral with detached Whirls. 



spirula. 16. Shell spiral, with the whirls cylin- 

 drical and detached; aperture orbicular. 



Nautilus Spirula. Linnceus Syst.Nat. p. 11 63. Martini, i. 



p. 262, Vignette at p. 254, and t. 20. f. 184 and 185. 



Born Mm. p. 143. Schroeter Einl. i. p. 13. 

 Nautilus Spicula. Gmelin, p. 3371- 

 Spirula fragilis. Lamarck Syst. des Animaux, p. 102. 

 Le Cornet de postilion. Favanne, i. p. 731. t. 7. f. E. 

 Lister Conch, t. 550. f. 2. Rumphius Mm. t. 20. f. No. 1 . 



Gualter, t. 19- f- E. Klein Ost. t. 1. f. 6. Argenville, t. 



5. f. G. Geve. t. 3. f. 8. Knorr, i. t. 2. f. 6. 

 Inhabits the coasts of America, Amboyna, and the Molucca 

 Islands. Linnaus. Barbadoes. Lister. Jamaica. Brey- 

 nius. Martinique, and the Isle of France. Favanne. 

 Nautilus Spirula is most commonly about an inch in diameter ; 

 of a whitish or cream colour without, and pearly in the in- 

 side. The whirls are detached from each other, and in the 

 broken state in which they are usually found, their appear- 

 ance has obtained for the shell the name of the Ram's horn, but 

 that of the Crozier is more applicable to a perfect specimen. 

 The principal chamber is a straight cylinder, so extremely 

 brittle, that even a vestige of it is but rarely to be met with ; 

 and Linnaeus, who never saw more than the spiral ter- 

 mination, mistook and described it in this broken state for a 

 perfect shell. The cylindrical chamber, which, independent 

 of its separated whirls, is sufficient to distinguish this species 

 from the Nautili, induced Da Costa to place it in the fossil 

 genus Lituus, of Breynius, and the generic character of La- 

 marck's Spirula is also taken from it. 



spengleri. J 7. Shell spiral, smooth, minute, with 

 detached whirls, and four conical tubercles. 



Nautilus Spengleri. Gmelin, p. 3371. 



Spengler Schr. Danish. Ges. i. p. 373. t. 2. f. 9, b and c. 

 Inhabits sands in India. Gmelin. 

 To the foregoing specific character Gmelin has only added that 



the shell is very minute, and I have been unable to procure the 



work of Spengler's, from which this and the following species 



are taken. 



