82 MOLLUSCA FROM THE CRAG. 



above and below it. My specimens are smooth and glossy, but they appear as if they 

 had been rubbed, and the greater number of them are rather more slender than the one 

 represented. The costae terminate at the edge of the volution, and the base is smooth. 



7. CHEMNITZIA FILOSA. S. Wood. Tab. X, fig. 7, 7 a. 



TURBONILLA FILOSA. S. Wood. Catalogue 1842. 



Ch. Testa turritd, subulatd ; anfractibus septem vel octo convexiusculis, longiiudinaliter 

 obsolete costatis ; transversim regulariter striatis ; basi rotundato ; aperturd subovatd ; 

 labro extm incrassato, intus l&mgato. 



Shell turreted and tapering, with seven or eight slightly convex volutions, longi- 

 tudinally costated ; costae nearly obsolete, transversely striated ; aperture subovate ; 

 outer lip thickened, varicose, smooth within. 



Axis, ^ of an inch. 



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



I have found about a dozen specimens of this shell, which appear distinct from any 

 species I am acquainted with. It has about eight thread-like striae equally distributed 

 upon each whorl, which are continued over the obsolete ribs as well as over the base of 

 the shell ; the costae terminate at the edge of the volution, which is somewhat rounded. 

 The outer lip is thickened externally in its adult state, and sometimes the animal has 

 increased the shell beyond its ordinary size, leaving a thickened and obtuse varix upon 

 the exterior. The last volution has from eight to ten erect, obtuse, or varicose costae. 

 The columella is not so straight in this as in most of the species of the genus, which 

 gives the aperture an ovate form, broader at the lower part. 



Some time since Prof. E. Forbes identified this shell with Parthenia varicosa, described 

 in his Report upon the Invertebrata of the J^gean Sea, published in the Report of the 

 British Association, 1843. I should have given that name upon his authority, but, 

 upon referring to the description contained therein, I think there must be some mistake ; 

 that shell is described as having 11 volutions with 18 20 costae, and as being only half 

 an inch in length. I have, therefore, for the present, left the species with the pro- 

 visional name of my Catalogue. 



8. CHEMNITZIA DENSECOSTATA. Phil. Tab. X, fig. 8, 8 a. 



CHEMNITZIA DENSECOSTATA. Phil. En. Moll. Sic. vol. ii, p. 137, t. 24, fig. 9, 1844. 

 TURBONILLA CYLINDRELLA. S. Wood. Catalogue 1842. 



Ch. Testa aciculatd, subcylindraced ; anfractibus convexiusculis, costatis ; costis nume- 

 rosis, elevatis, interstitiis striatis ; columella recta subplicatd; labro simplici, intus laevigato. 



Shell suberect, subcylindrical, slender ; whorls slightly convex, costated ; costae 

 numerous, nearly erect, elevated, smooth ; intermediate spaces transversely striated ; 

 aperture subovate; columella straight, subplicated; outer lip simple, not dentated within. 



Axis, 5 of an inch. 



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



