TRACHELIPODA. 93 



with undulated streaks of reddish flesh-colour, or brownish 

 carnation. One inch long. Inhabits the European seas. 



Genus 43.— ROTELLA — Lamarck. 



Generic Character. — Shell orbicular, glossy, destitute of 

 epidermis ; spire short, subconic ; lower parts convex and 

 callous ; aperture half round. 



Rotella vestiaria. — ^The Ornabiental Rotella. Plate 

 XII. fig. 18. Pale skin-coloured, or citron-coloured, the 

 upper part of body and spire spotted with dark brown. 

 Half an inch long. Inhabits the Indian ocean. 



Genus 44.— SOLARIUM Lamarck. 



Generic Character — Shell orbicular, in the form of a 

 depressed cone ; largely umbilicated ; internal margins of 

 tlie volutions, which are visible in the umbilicus, crenu- 

 lated ; aperture wide ; mouth quadrangular, destitute of a 

 columella. 



Solarium perspectivum. — The Perspective Solarium. 

 Plate XII. fig. 23. Cream-yellow, with brown or chestnut 

 and white bands near the sutures of the volutions ; umbili- 

 cus ample, and crenulated. Two and a half inches broad. 

 Inhabits the Indian ocean. 



FAMILY II. SCALARIDEA. 



Shell devoid of plaits or folds on the columella ; margins 

 of the aperture united in a circular form. 



Genus 45.— DELPHINULA.— Zamarc^. 



Generic Character. — Shell subdiscoid or conical, umbili- 

 cated, solid ; volutions of the spire rough or angular ; aper- 

 ture entire, round, sometimes trigonal, with the edges united, 

 and generally provided with a fringe, or a thick marginal 

 ridge ; spire depressed. 



Delphinula laciniata. — The Fringed Delphinula. 

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



