Messrs. H. & A. Adams on new Genera of Mollusca. 19 



pheriam vix angulato ; apertura acuminato-ovata ; labio arcuato, 

 incrassato ; labro in medio subproducto. 



Hab. China Sea. 



Genus Leiopyrga, H. & A. Adams. 



Testa turbinato-turrita, perforato-umbilicata, tenuis, porcellana, 

 laevsi, nitida. Apertura subcircularis, spira brevior ; labio tenui ; 

 columella angusta, excavata, incurvata ; labro simplici, margine 

 acuto. 



This genus is established on a shell which by some would be 

 regarded as a thin, umbilicated Phasianella or Eutropia. It has, 

 indeed, somewhat of the aspect of Bankivia, the interior of the 

 aperture not being nacreous ; but the columella does not end in 

 the Achatinoid truncation peculiar to that genus. The animal 

 and operculum of Leiopyrga are unknown. 



Leiopyrga picturata, H. & A. Adams. 



L. testa subturrita, perforata, tenui, lsevi, lineolis longitudinalibus 

 undulatis, rufescentibus, ad suturas saturatioribus et punctatis pul- 

 cherrime picta ; anfractibus Gg, convexis, subimbricatis, longitudi- 

 naliter substriatis, transversim obsolete sulcatis ; suturis profundis, 

 marginatis. 



Hab. ? 



The shell is thin, porcellanous, shining, and very prettily 

 marked with red-brown wavy lines, which assume, at the sutures 

 and at the periphery of the last whorl, the appearance of dark 

 round spots. The specimen from which our description is taken 

 is in the collection of R. Tyler, Esq. 



Genus Taheitia, H. & A. Adams. 



Testa elongata, subcylindrica, decollata ; anfractibus longitudina- 

 liter costellatis. Apertura ovata, anfractu penultimo late sejuncta ; 

 peristomate continuo, extrorsum expanso. 



Operculum testaceum, larninis erectis, radiantibus, excentricis in- 

 structum. 



We have considered it necessary to distinguish this remark- 

 able Taheitian shell from the other species of Truncatella on 

 account of the shelly operculum, which is furnished with erect, 

 radiating lamellse. The last whorl is curiously porrected, as is 

 the case in the genus Cijlindrella. 



Taheitia porrecta, Gould. 

 Truncatella porrecta, Gould, Otia Couch, p. 40. 



Genus Chromotis, H. & A. Adams. 



Testa ovata, auriformis, imperforata, tenuis, leevis, polita ; spira ob- 



2* 



