TKACHELIPODA. 81 



Genus 45.— DELPHINULA.— i^amarcA. 



Generic Character. — Shell subdiscoid or conical^ umbilicated, 

 solid ; volutions of the spire rough or angular ; aperture entire, 

 rounds sometimes trigonal, with the sides united, and generally 

 provided with a fringe, or a thick marginal ridge ; spire de- 

 pressed. 



Delphinula laciniata. — The Fringed Delphinula. Plate 

 XII. fig. 22. Umbilicus large, surrounded by large vaulted 

 scales, in spiral rows ; also with strong waved spiral stride ; 

 brownish-red, variegated with white. Two inches long. Inha- 

 bits the Indian seas. 



Genus 46. — SCALARIA.— Za»iarc/t. 



Generic Character. — Shell subturrited, with longitudinal, ele- 

 vated, subacute, interrupted ribs ; aperture rounded y margins 

 united in a circle, and a reflected ridge. 



Scalaria pretiosa. — The WENTLETRAP,or Precious Scalaria. 

 Plate XII. fig. 20. Conical, smooth, cream-yellow ; volutions 

 deeply divided ; spire detached, with a deep umbilicus ; volutions 

 connected by longitudinal ribs ; body extremely ventricose. 

 One and a half inch long. Inhabits the Indian ocean. 



Genus 47.— VERMET US.— Xamorc/t. 



Generic Character, — Shell thin, tubulose, loosely spiral in the 

 lower part, three or four upper volutions, regularly spiral ; at- 

 tached to other substances by the apex of the spire ; aperture 

 orbicular, margins united, and provided with an operculum. 



These shells are remarkable on account of their adhering or being affixed 

 to marine bodies by the attenuated and pointed extremity of the spine. 



Vermetus lumhricalis. — The Worm. like Vermetus. Plate 

 XII. fig. 21. Variously twisted ; reddish-brown, sometimes 

 clouded with darker brown. Two to four inches long. Inhabits 

 the African seas. 



FAMILY III PLICACEA. 



Shell with the aperture somewhat contracted^ and the colu- 

 mella plaited. 



