GASTEROPODA. 79 



Shells somewhat of this form have been long known from the older Secondary 

 Formations, and were placed in a genus by Phillips, under the name of Loxonema ; 

 they do not, however, appear to possess the quadrate form of aperture and straight 

 columella of these shells, although they have been united to this genus by M. 

 d'Orbigny and other continental authors. 



As a recent genus it appears to have a very extended geographical range, and 

 is rather inclined to deep water. 



1. Chemnitzia cdrvicostata. S. Wood. Tab. X, fig. 1, 1 a. 



Turbonilla curvicostata. S. Wood. Catalogue 1842. 



Ch. Testa elonyato-turritd, tenui, fragili; anfractibus planiusculis, plicatis ; plicis 

 confertis, obliquis, vel curvatis -, suturis prq/'undis , labro acuto. 



Shell turreted and elongate, thin and fragile, with an obtuse apex ; volutions 

 7 — 8, rather flat ; suture distinct and deep ; longitudinally costated, or plicated ; 

 costee oblique and curved ; columella straight and naked. 



Axis, y of an inch. 



Locality. Cor. Crag, Sutton. 



I have but three specimens of this species, and those are not in very good 

 condition. The remains of its curved costse and straight columella are almost the 

 only distinguishing characters. It may possibly be the Turbo indistinctus, Mont. 

 (Sup. p. 129), but that shell is described as punctured in the furrows, which I 

 cannot observe in my specimens, the costge are much curved, broad, and close, and 

 have the spaces between them thin and narrow. 



It somewhat resembles the figure of Ch. terebellum, Phil. (En. Moll. Sic. vol. ii, 

 p. 138, t. 24, f. 12), but our shell seems to have been larger, and the costee more 

 oblique and curved. I have therefore, for the present, left it with its provisional 

 name until it can be better determined. The apex in my specimens is very obtuse, 

 flattened, and depressed, but not reversed like the general character of this genus, 



2. Chemnitzia ruea. Phil. Tab. X, fig. 2, 2 a, 2 b. 



Melania rufa. Phil. En. Moll. Sic. vol. i, p. 156, t. 9, fig. 7, 1836. 

 Paethenia ceenata. Loive. Proc. Zool. Soc. p. 41, 1840. 

 Turbo crenatus. Montague (inedit.) 

 Tukbonilla rufa. S. Wood. Catalogue 1842. 



— Locen. Ind. Moll. Scand. p. 18, 1846. 

 Chemnitzia rufa. Phil. En. Moll. Sic. vol. ii, p. 136, 1844. 



Ch. Testa turriculd ; anfractibus planiusculis ; longitudinal iter cosialis ; coslis rectis ,■ 

 interstitiis transversim striatis ; suturis profundis ; aperturd subquadratd ; columella recta. 



Shell turriculate ; whorls 8 — 9, flatfish ; longitudinally costated ; ribs vertical, 

 transversely striated ; suture deep ; aperture subquadrate ; outer lip simple, plain 

 withm. 



Axis, -|- of an inch ; diameter, \ of its length. 



Locality. Cor. Crag, Sutton. Recent, Mediterranean, 



