342 NAUTILUS. 



Shell minute, spiral, with about twenty flexuous crenated 

 joints in the exterior whirl, marked by elevated stria? ; the 

 sides are uniform and carinated on the outer edge. This is 

 an elegant species, and forms a curious object for the micro- 

 scope. 



beccarii. 9. Shell spiral, with contiguous swollen 

 whirls, contracted at the partitions ; aperture 

 ob-ovate. 



Nautilus Beccarii. Lin. Syst. Nat. p. 1162. Martini, i. p. 

 261. t. 20. f. 175 to 177. Schroeter Einl. i. p. 1 1, and 

 Inn. Bau. Conch, t. 1. f. 3. Gmelin, p. 3370. Walker's 

 Min. Shells, t. 3. f. 63. Adams's Microsc. p. 640. 1. 14. 

 f. 29. Montagu Test. p. 186, and Supp. p. 74. t. 18. f. 

 4. Maton and Racket, in Lin. Trans, viii. p. 116. 

 Dorset Catalogue, p. 42. 1. 19. f. 28. 

 PlancuSf t. 1. f. 1. Gualter, 1. 19. f. H and I. Favanne, 

 t. 69. f. D 1. 

 Variety. With the Whirls reversed. 

 Nautilus perversus. Walker's Min. Shells, t. 3. f. 64. Mon- 

 tagu Test. p. 187. t. 18. f. 6. 

 Le Corne d'Ammon microscopique. Favanne, i. p. 730. 



t, 7. f. B 2. 

 Martini, 1. 19. f. 178, 179- 

 Inhabits the Sea on Fucus vesiculosus, the roots of other Algae, 

 and on shells ; frequent on the shores of Britain, and among 

 the sands of the South Seas, as well as those at Rimini in the 

 Adriatic. Montagu. 

 Shell minute, white, and pellucid, or sometimes covered with 

 a brown epidermis, and while the animal is alive its crimson 

 colour appears through the shell ; whirls four or five with 

 deep contractions at the partitions, of which there are ten 

 in the outer whirl ; the upper side is convex, and the lower 

 flat. The Variety above noticed, differs in no respect be- 

 sides having the whirls reversed, and Mr. Montagu differs 

 from other authors in supposing it to be a distinct species. 



balthicus. 10. Shell spiral, convex, with the first 

 whirl larger than the others ; aperture linear. 



Nautilus Balthicus. Gmelin, p. 3370. 



Nautilus, No. 2. Schroeter Einleitung, i. p. 20. t. 1. f. 2. 

 Inhabits the Baltic, adhering to the roots of Fuci. Schroeter. 

 Shell minute, white, polished, sometimes opake, and sometimes 



pellucid ; whirls five, of which the outer is the largest, and 



