1875.] G. & H. Nevill— New Species of Marine Mollusca. 181 



Clathurella exqidsita. 



Closely allied to Pease's C. canaliculata ; differs by the absence of the 

 brown line beneath the transverse white band, by the suture not being 

 coloured brown, by the contracted last whorl, by the more prominent canal, 

 and finally by its smaller size. 



Long. 9f , diam. 4 mil. Mauritius. 



Clathurella Smithi. 



Minute, angularly fusiform, attenuated ; apex round, slightly sinistral ; 

 white, tinged with brown on columella and outer lip ; whorls 7, acutely 

 angled, depressly excavated near the suture, decussately keeled ; columella 

 twisted, sinus deep. 



Long. 3|, diam. If mil. Persia. 



Clathurella perplexa. 



Resembles Mangelia FairbanTci in many respects ; whorls 8, longi- 

 tudinally broadly and somewhat convexly ribbed, transversely striated ; ash 

 colour, columella and outer lip brown ; columella slightly twisted. 



Long. 6, diam. 1\ mil. Bombay, Ceylon. 



Clathurella singularis. 



Elongate and fusiform, apex pointed ; white, with a few obsolete brown 

 markings on the last whorl ; whorls 9, transversely regularly striated, longi- 

 tudinally faintly and obtusely ribbed ; columella straight and smooth, sinus 

 deep and rounded ; under the lens very minutely, regularly longitudinally 

 striated. Allied to Cithara Delacouriana of Crosse. 



Long. 8f, diam. 3J mil. Andamans. 



Clathurella JSIasoni. 



Ovately fusiform, white, peculiarly scalariform ; six angular whorls, 

 broader above than at their base, longitudinally strongly ribbed, transverse- 

 ly prominently, distantly striated ; columella smooth, sinus very deep, 

 aperture small and contracted. Allied to PZ. scalata of Souverbie. 



Long. 4, diam. 2 mil. Andamans. 



Clathurella Martensi. 



Conically fusiform, dark brown with lilac granules ; seven rounded 

 whorls, distantly reticulated, with three rows of large granules where the 

 ridges bisect one another ; an excavated furrow towards the base of the 

 last whorl ; columella strongly twisted, of a lilac colour with a few denticu- 

 lations at its edge ; the aperture and denticulations within the outer lip 

 arc also lilac-coloured ; sinus deep, outer lip abruptly contracted near its 

 base, forming a strongly marked canal. 



Long. 5, diam. 2 mil. Ceylon. 



