84 MOLLUSCA FROM THE CRAG. 



10. Chemnitzia varicula. S. Wood. Tab. X, fig. 10, \0a. 



TuiiBONiLLA VARICULA. S. TFoocl. Catalogue 1842. 



C7i. Testa turritd, elon(/ato-pyramidcdi ; aiifractibus convexiusculis ; longitadaliter 

 costatis ; costia 10 — 12 obtusis depressis, distantibus ; transversim striatis ; striis vel sulcis 

 S — 9 ; aperturd subquadratd ; labro acuto, ititus Icevigcdo. 



Shell turreted, elongato-conoidal ; whorls slightly convex ; suture distinct, longi- 

 tudinally costated, with small, vertical, and distant costse, transversely striated or 

 sulcated, with 8 — 9 depressed lines ; mouth subquadratc ; outer lip sharp, and smooth 

 within (?). 



Jxis, § of an inch. 



Locality. Cor. Crag, Sutton. 



I have about a dozen specimens, which offer characters resembling this genus, but 

 the mouths of all of them are more or less broken. It slightly resembles Rissoa 

 varicosa, Bast., but that is a larger shell, vn\h fewer varices, and is toothed within 

 the outer lip ; our shell has 9 — 10 volutions, is very much less in size, and the costse 

 become obsolete on the lower portion. 



11. Chemnitzia similis. Forbes. Tab. X, fig. 11, a — c. 



TuRBONiLLA ELEGANTIOR. S. Wood. Catalogue 1842. 



Ch. Testa turritd, mhulatd, elongatd, ]}olitd ; anfradibm 'planis ; longitmlinaliter obso- 

 lete costatis; transversim sulcatis ; sulcis quinque ; aperturd subquadratd ; columelld rectd, 

 obsolete uiiiplicato ; labro iiitus Icevigato. 



Shell elongato-turriculate, tapering, glossy ; apex obtuse ; longitudinally costated ; 

 costse obsolete ; transversely striated or sulcated ; suture deep ; aperture subquadrate ; 

 left lip slightly reflected, with an incipient fold upon the columella; outer lip simple, 

 not dentated within. 



Axis, I of an inch. 



Localiti/. Cor. Crag, Sutton. Recent, British Seas. 



Imperfect specimens of this shell are by no means rare, but the surface is generally 

 much rubbed. It is, however, distinctly marked with about five deep sulci, which cut 

 the numerous and rather obsolete costse, making the surface somewhat reticulated. 

 The sulci or striae are continued over the base, which is rather rounded ; some have a 

 tooth-like projection upon the columella, in others it is not visible. Professor E. Forbes 

 tells me it is the same as the recent British species, and I have given it upon his 

 authority. Fig. 11, b, is the representation of a specimen that has become quite smooth : 

 another specimen in my cabinet has tranverse striae, but no costse.* 



* Two specimens apparently of another species, belonging probably to this genus, are in my Cabinet, 

 but the mouths are too much broken for correct description. 



The minute, sinistral, planorbis-like looking shell figured with my Catalogue (An. and Mag. Nat. Hist. 

 1842, pi. 5, fig. 12,) is, perhaps, the fry of one of the species of this genus. 



