348 NAUTILUS. 



Inhabits the Adriatic and Mediterranean. Linnceus. 



Shell minute, white, straight, and pointed. Lamarck has re- 

 vived the genus Orthocera of Breynius and Gualter, which 

 includes several of the neighbouring as well as the present 

 species. The Nautilus Orthocera of Linnaeus has, I be- 

 lieve, never been found in any other than a fossil state, and 

 is therefore not described in the present work. 



costatus. 25. Shell straight, sub-cylindrical, with 

 swollen joints, and from four to seven longi- 

 tudinal ribs. 



Nautilus costatus. Montagu Test. p. 199. t. 14. f. 5, and 

 Supp. p. 83. t. 19- f. 2. Maton and Rackety in Lin. 

 Trans, viii. p. 120. 

 Inhabits the coast of Kent. Mr. Boys. 



Shell minute, from one to three lines long, varying with from 

 five to twelve swollen joints, and from four to seven longitu- 

 dinal ribs. It is nearly allied, and may perhaps be only a va- 

 riety of N. Raphanus. 



granum. 26. Shell straight, oblong, with swollen 

 joints, and eight elevated interrupted striae ; 

 syphon oblique. 



Nautilus Granum. Linnceus Syst. Nat. p. 1164. Schroe- 

 ter Einl. i. p. 16. Gmelin, p. 3372. 



Inhabits the Mediterranean. Linnceus. 



Shell minute. Linnaeus says it differs from N. Raphanus in be- 

 ing more oblong, and in having only eight stria?, which be- 

 ing interrupted by the contractions at the partitions, give the 

 shell somewhat of a reticulated appearance. 



radicula. 27. Shell straight, ovate-oblong, with 

 swollen glabrous joints. 



Nautilus Radicula. Linnceus Syst. Nat. p. 1164. Schroe- 



ter Einl. i. p. 17. Gmelin, p. 3373. Montagu Test. 



p. 197. t. 6. f. 4, and t. 14. f. 6. Maton and Racket, in 



Lin. Trans, viii. p. 1 19- 

 Plancus, t. 1. f. 5. Martini, i. Vign. 1. at page 1. f. 



G, G, and g. 

 Inhabits the Adriatic. Linnceus. Coast of Sandwich. Mr. 



Boys. 

 Shell minute, opake, brown, smooth with from two to five 

 joints, and Mr. Montagu says this species is subject to verj 

 considerable variation with respect to the shape of the ex- 



