350 NAUTILUS. 



nally, but the striae are interrupted by elevated rings at the 

 partitions, which are smooth ; summit rather obtuse; aper- 

 ture toothed at the margin, and the syphon central. 



in^equalis. 32. Shell cylindrical, with eight joints, 

 of which the second and third are very short ; 

 aperture margined. 



Nautilus inaequalis. Gmelin, p. 3373. 



Spengler Dan. Ges. Schr. i. p. 373. t. 2. f. 10 a, b and c. 

 Inhabits the Red Sea, among sand. Gmelin. 

 Shell minute, and pure white. 



siphunculus. 33. Shell straight, smooth, with re- 

 mote cylindrical joints, and intermediate cy- 

 lindrical contractions. 



Nautilus siphunculus. Linnmis Syst. Nat. p. 1 164. Schroe- 



ter Einl.i. p. 18. Gmelin, p. 3373. 

 Gualter, t. 19- f. R, S. Martini, i. Vign. 1. at p. 1. 

 f.F,ff,Mdf. 

 Inhabits the shores of Sicily, adhering to coral rocks. Gme- 

 lin. 

 Shell minute, with about eleven alternately broader and nar- 

 rower cylindrical divisions, all of which are nearly equal in 

 length. 



legumen. 34. Shell compressed, jointed and mar- 

 gined on one side ; syphon lateral. 



Nautilus Legumen. lAnn&us Syst. Nat. p. 1 1 64. Schroe- 

 ter Einl. i. p. 16. Gmelin, p. 3373. Maton and Rack- 

 et, in Lin. Trans, viii. p. 118. Montagu Supp. p. 82. 

 t. 19- f. 6. 

 Plancus, t. 1. f. 7. Gualter, t. 19- f. P. Walker's Min. 

 Shells, t. 3. f. 74. Martini, i. Vign. 1. at p. 1. f. E e. 

 Inhabits the Adriatic. Linnaus. Coasts of Kent, and South 



Devonshire. Montagu. 

 Shell minute, somewhat curved on one side, and straight on 

 the other ; smooth, glossy, pellucid, white, rather compress- 

 ed, and nearly of equal size throughout ; joints oblique. The 

 concave side is opake by reason of the continuation of the 

 syphon, which gives the appearance of a margin, but Mr. 

 Montagu says that there is neither a margin or a keel on ei- 

 ther side. 



