19(5 



of thofe near the aperture: tlie joints too, regularly de- 

 creafe in fize, from the mouth to the end: the back is 

 arched, but does not appear carinated. 



We n-,ould certainly have confidered this a dillinft fpe- 

 cies, had there not been a reference on the drawing, to 

 Walker's figure; and as we have never had an opportu- 

 nity of examining either of the fhells, we dare not venture 

 to give it a dilHn6l place. 



Semilituus. NautUus femilituus. Gmel. Syji. p. 3372. 12. 



Turt. Lin. iv. p. 308. 

 M^'aJk. Min. Shells, f. 73. 

 Martini Conch, i. t. 20. f. 186. 137. 

 Nautilus fubarcuatulus. Adams. Microfc. p. 612. t. 14. f. 33. 



Turt, Lin. iv. p. 307. 



N. with an elongated, fub-arcuated fhell, with elevated 

 joints; apex incurvated : aperture with a fraall, produced 

 Syphon : colour opaque brown. 



From Sandwich and Sheppey ifland ; rare. 



Mr. Walker's figure does not exprefs the produced 

 fyphon, and is much too large at that part; whereas, it 

 tapers confidcrably from the middle towards the aperture, 

 and x\\Q fyphon is placed nearly in a line with the back, or 

 outer margin. 



Vi'e were obliged to Mr. Boys for fine fpecimens of 



this fliell, as well as a very corre61. drawing, referring to 



Walker's figure. 



'' ■ Nautilus 



