TRACHELIPODA. 81 



Genus 45.— DELPHINULA.— Z-a/uarc^ 



Generic Character. — Shell subdiscoid or conical, umbilicated, 

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

 round, 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 striae; 

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

 bits the Indian seas. 



Genus 46. — SCALARIA.— -Za/warc^i. 



Generic Character — Shell subturrited, with longitudinal, ele- 

 vated, subacute, interrupted ribs ; aperture rounded ; 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 i7.—VERMET US.— LamarcL 



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-Lhce Vermetus. Plate 

 XII. fig. 2'L 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. 



