90 G. & H. Nevill — Descriptions of new Marine Mollusca. [No. 2, 



outer lip varicose, much more strongly developed than the others ; ribs of 

 the 5th and 6th whorls perfectly straight, on the 7th and 8th angulated 

 about the middle, the last whorl angulated at about the 4th or 5th of the 

 transverse strige ; columella straight, smooth, a small tooth-like projection 

 at the commencement of the deep, rounded sinus ; outer margin of the 

 lip almost straight, much produced, exceedingly sharp ; interior of aper- 

 ture white, smooth, and shining ; under a powerful lens only can be seen 

 a microscopical, regular, longitudinal striation, these stria? are bent in 

 the same way as the last varicose rib and should perhaps be called strise 

 of growth, they are a trifle more distinct close to the suture. 



Long. 8i, diam. 3^ mil. 



(Coll. Indian Mus. and Rev. J. Warneford.) 



Three or four specimens only of this interesting species were dredged by 

 Mr. Wood-Mason at a considerable depth at the Andamans. In shape and 

 sculpture it resembles most closely Gythara Delacouriana of Crosse (J. 

 de Conch. 1872, pi. fig. ) ; the columella and outer margin are, however, 

 both perfectly smooth and the sinus is much more distinct, the spire too is a 

 great deal longer in proportion to the last whorl, in length the last whorl 

 (measured at the back) is 4^ mil., the other whorls altogether only measur- 

 ing 4 mil. We have felt considerable doubt whether this species is correctly 

 classed as a Clathurella ; perhaps it would be better placed with Mangelia. 



Clathukellla Masont, n. sp., PI. VII, Fig. 7. 



Shell ovately fusiform, white, remarkably scalariform ; six angular 

 whorls, broader at the top than at their base, the first two rounded, smooth 

 and embryonal, the others prominently and regularly, somewhat distantly, 

 transversely striated (four striae on the 4th and 5th whorls), longi- 

 tudinally strongly ribbed, ribs pointed and very prominent at their com- 

 mencement, nine of them on the last whorl ; columella and aperture smooth, 

 with a row of regular, rounded granules just within the acute margin 

 of the outer lip, this latter is very broadly reflected and has a longi- 

 tudinal, somewhat obsolete rib down its centre, this being decussated by seven 

 transverse strise presents the appearance of a double row of granules ; the 

 outer margin where it joins the body whorl is callous and thickened, the sinus 

 very deep and rounded, the aperture small, contracted, as nearly as possible 

 of equal width all the way down from the sinus to the end of the canal. This 

 species agrees remarkably, as regards sculpture and shape of the whorls, with 

 a shell described as PI. scalata by Souverbie (J. de Conch., 1874, 

 pi. VIII, fig. 4) ; it differs, however, by the totally different character of the 

 aperture and by its fewer whorls. 



Long. 4, diam. 2 mil. 



Dredged by Mr. Wood-Mason at the Andamans. 



