MANGELIA. 199 



times bluntly pointed at the back. Where an operculum 

 exists, it is ""unguiculoid/^ or composed of successively ad- 

 vancing horny layers, the first and smallest of which is at 

 the pointed end. The animal is generally white, sometimes 

 speckled with grey. 



31. turricula has the foot partly divided, and spread into 

 auricles in front. Shell white ; whorls turreted, with 

 blunt angulated ribs ; aperture shorter than spire. 

 31. Trevelyana : shell white, short, with crowded ribs ; aper- 

 ture as long as the spire. 

 31. rufa : shell brownish ; whorls not distinctly turreted ; 



bluntly ribbed. 

 31. septa/ipilaris : foot short, bell-shaped; shell flesh-co- 

 loured, with nearly straight whorls, having flexuous 

 blunt ribs, seven on each ; outer lip thickened, strongly 

 sinuous. 

 31. nana : shell small, white ; the whorls round, "spirally 



grooved. 

 3f. teres : foot divided in front into auricles, triangular at 

 the back ; tentacles long and thin ; shell spotted with 

 chestnut markings, spirally ribbed; outer lip strongly 

 notched at the suture, grooved within ; whorls rather 

 turreted. 



