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 curvicostata. S. Wood. Tab. X, fig. 1, la. 



TuEBONiLLA cuKTicosTATA. S. Wood. Catalogue 1S42. 



Ch. Testa elongato-turritd, tenui, fragili; anfractihus planiusculis, plicatis ; plicis 

 confertis, obliquis, vel curvatis ; suturis profundis, labro acuta. 



Shell turreted and elongate, thin and fragile, with an obtuse apex ; volutions 7 — 8. 

 rather flat ; suture distinct and deep ; longitudinally costated, or plicated ; costae oblique 

 and curved ; columella straight and naked. 



Axis, \ 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 costae and straight columella are almost the only distinguishing 

 characters. It may possibly be the Turho indistiactus, Mont. (Sup. p. 129), but that 

 shell is described as punctured in the furrows, which I cannot observe in my specimens, 

 the costae are much curved, broad, and close, and have the spaces between them thin 

 and narrow. 



It somewhat resembles the figure of Ch. terebellmn, Phil. (En. Moll. Sic. vol. ii, p. 1 38, 

 t. 24, f. 12), but our shell seems to have been larger, and the costae more oblique and 

 cun^ed. I have therefore, for the present, left it with its pro\asional 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 rufa. Phil. Tab. X, fig. 2, 2 «, 2 b. 



Melaxia rufa. Phil. En. Moll. Sic. vol. i, p. 156, t. 9, fig. 7, 1S36. 

 Paethenia crenata. Lowe. Proc. Zool. Soc. p. 41, 1840. 

 Turbo ckenatds. Montague (inedit.) 

 TuKBOXiLLA rufa. S. Woofl. Catalogue 1842. 



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



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



Ch. Testa turriculd ; anfractibus planiusculis ; lonc/itudinaliter costatis ; costis rectis ; 

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



Shell turriculate ; whorls 8 — 9, flattish ; longitudinally costated ; ribs vertical, trans- 

 versely striated ; suture deep ; aperture subquadrate ; outer lip simple, plain within. 



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



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



