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, subdatd ; anfractibus septem vel odo convexiusculis, hngitudinaliter 

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

 labro extus incrassato, intus Icevigato. 



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

 tudinally costatcd ; costte nearly obsolete, transversely striated ; aperture subovate ; 

 outer lip thickened, varicose, smooth within. 



Axis, \ of an inch. 



Localitij. 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 hp 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 iEgean 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 ha\'ing 11 volutions with 18 — 20 costae, and as being only half 

 an inch in length. I have, therefore, for the present, left the species vdth 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, jj. 137, t. 24, fig. 9, 1844. 

 TuEBONiLLA CYLINDEELLA. S. Wood. Catalogue 1842. 



Ch. Testa aciculatd, subcylindraced ; anfractibtts conveximcuUs, costatis ; costis nume- 

 Tosis, elevatis, interstitiis striatis ; columelld redd subplicatd ; labro simplici, intus lavigato. 



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, \ of an inch. 



Localiti/. Cor. Crag, Sutton. Recent, Mediterranean. 



