GASTEROPODA. 83 



This is not a very rare species. I have presumed this to be the shell described by 

 M. Philippi, although my specimens have an obtuse apex, not corresponding in that 

 character with what he calls " apice acuto." The furrows between the ribs are rather 

 wider than the ribs themselves, and run into the suture at the lower part, but not at 

 the upper, from the overlapping of the succeeding volution, and the whorls are rather 

 more convex than those represented at the above reference. The first five or six 

 volutions present an elongato-conical form, after which the shell becomes nearly 

 cylindrical. It is slender and elegant, rather more so than our figure represents, and 

 covered with numerous nearly vertical ribs, the last whorl having as many as twenty- 

 four. I am not acquainted with the recent shell, and have trusted for this identification 

 to the figure and description by M. Philippi. 



9. CHEMNITZIA UNICA(?). Mont. Tab. X, fig. 9, 9 a. 



TURBO UNICUS. Mont. Test. Brit. p. 299, t. 12, fig. 2, 1803. 



Turt. Conch. Diet. p. 209, 1819. 



PARTHENIA PALLIDA(?). Lowe. Zool. Proc. p. 42, 1840. 

 CHEMNITZIA PALLIDA (?). Phil. En. Moll. Sic. vol. ii, p. 136, t. 9, f. 8. 

 TURBONILLA susuLATA. S. Wood. Catalogue 1842. 



Cli. Testa turritd, subulatd, aciculatd, gracili, politd ; anfractibus numerosis, convexius- 

 culis ; longitudinaliter plicatis ; plicis confertis, obliguis ; suturis distinctis ; aperturd sub- 

 quadratd ; columella recta. 



Shell turriculate, slender, elongate and tapering, smooth and glossy ; whorls 

 slightly convex, longitudinally costated ; costse numerous, close, and oblique, inter- 

 mediate spaces transversely striated (?) ; suture deep and distinct, with a sub- 

 quadrate aperture and straight columella. 



Axis, 5 of an inch. 



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



My cabinet contains five specimens of this slender shell, which is assigned to 

 Ch. unica with doubt. It resembles a very slender variety of Ch. elegantlssima., but differs 

 from that species in being more elongate. The volutions in my specimens project 

 more at the lower part than they do above ; and the furrows between the costae 

 appear to terminate before reaching the suture ; whereas, in elegantissima, they run 

 into it. My specimens are evidently much rubbed, and do not show the inter- 

 mediate striae distinctly. Our shell differs materially from the figure referred to, 

 (Chemn. pal'lida, Phil. t. 9, f. 8,) in being more slender, the costae more inclined, 

 and the volutions less convex ; it has a greater resemblance to Ch. gracilis of that 

 author (pi. 24, f. 11), but the furrows in our shell appear to terminate just before 

 reaching the suture, and the costse incline a little, but do not curve. The aperture 

 is subquadrate, with a straight columella, which has a slight thickening in the middle 

 like an incipient fold. 



