84 MOLLUSCA FROM THE CRAG. 



10. Chemnitzia varicula. JS. Wood. Tab. X, fig. 10, 10 a. 



Tukbonilla varicula. S. Wood. Catalogue 1842. 

 Ch. Testa turrit a, elongato-pyramidali ; anfractibus convexiusculis ; longitudinaliter 

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

 8 — 9; aperturd subquadratd ; labro aculo, intuslcevigato. 



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

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

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

 within (?). 



Axis, § 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, with fewer varices, and! is toothed 

 within the outer lip ; our shell has 9 — 10 volutions, is very much lessen size, and 

 the costse become obsolete on the lower portion. 



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



Turbonilla elegantior. S. Wood. Catalogue 1842. 



Ch. Testa turritd, subulatd, elongatd, politd ; anfractibus planis ; longitudinaliter obso- 

 lete costatis ; transversim sulcatis ; sulcis qui n que ; aperturd subquadratd ; columella recta, 

 obsolete uniplicato ; labro intus lavigato. 



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

 costas obsolete ; transversely striated or sulcated ; suture deep ; aperture sub- 

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

 lip simple, not dentated within. 

 . Axis, f of an inch. 



Locality. Cor. Crag, Sutton. Recent, British Seas # 



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

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

 which cut the numerous and rather obsolete costas, making the surface somewhat 

 reticulated. The sulci or stria3 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 speci- 

 men that has become quite smooth : another specimen in my cabinet has transverse 

 striae, but no costas.* 



•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. 



