344 NAUTILUS. 



Nautilus lobatulus. Walker's Minute Shells, t. 3. f. 71. 

 Adams's Microsc. p. 641. t. 14. f. 36. Maton and 

 Racket, in Lin. Trans, viii. p. 117. 

 Nautilus farctus. Fichtel and Moll, t.9.f. g, h, and i. 

 Serpula nautiloides. Gmelin, 3739. 



Serpula lobata. Montagu Test. p. 515, and Supp. p. 160. 

 Schroeter n. Litterat. iii. t. 3. f. 22 and 23. 



Inhabits the coasts of Norway on Madrepora prolifera. Schroe- 

 ter. On Fuci, shells, Sertulariae, and the byssus of Pinna in- 

 gens on the English coasts. Montagu. 



Shell minute, hardly a line in diameter, white or yellowish, ei- 

 ther roundish or more or less oblong, convex above, flat be- 

 neath, and with from six to eight parallel lobes. Mr. Mon- 

 tagu says no Nautilus is ever sessile, whereas this species is 

 never detached but by accident, and then the animal dies ; 

 and on this account he has placed it among the Serpulae, but 

 the structure of the shell is obviously that of a Nautilus. It 

 first appeared with the present name in the Essays on the 

 Microscope, and Adams there says he had obtained a MS. 

 corrected copy of the Minute Shells, to which Walker had 

 added all the trivial names which he has used. 



rugosus, 14. Shell spiral, with the whirls com- 

 pressed, and the margin thickened ; aperture 

 linear. 



Nautilus rugosus. Linnaus Syst Nat. p. 1162. Schroe- 

 ter Einl. i. p. 12. Gmelin, p. 3371. 

 Inhabits the Southern Ocean. D. Brunniche. Linnaus. 

 This species does not appear to have been ascertained by any 



subsequent author, and is described by Linnaeus to be minute, 



white, flattish, with prominent dissepiments appearing like 



transverse wrinkles. 



umbilicatus. 15. Shell spiral, with contiguous 

 compressed whirls ; aperture compressed, li- 

 near; umbilicus concave. 



Nautilus umbilicatus. Linnccus Syst. Nat. p. 1163. Schroe- 

 ter Einl. i. p. 12. Gmelin, p. 3371. 

 Column. Phytob. ii. t. 38. f. E. 



Inhabits Croatia. J. D. Kochler. Linnaus. 



Shell minute, jointed obliquely, and contracted at the parti- 

 tions, particularly on the keel. Uinn&us. 



