61 



plates, engraved for him by Antonio Gregorio, from drawings of Giu- 

 seppe Menaboni. In the description of these plates he designates these 

 shells as Bucdno-cassides. 



In one of the plates, and under the same designation, is the uncom- 

 mon shell represented Plate V. Fig. 17 and 19. This also was found in 

 the Tuscan hills ; and, according to Knorr, it has also been found in 

 Piedmont. The last turn of this shell is extremely large, when com- 

 pared with the other four' turns. The spire projects but very little. 

 The body of the shell is smooth, slight traces of transverse striae only 

 being observable. The right lip is of considerable thickness, and den- 

 tated on its inner surface. The left lip is extended along the body of 

 the shell, up to the termination of the right lip. The aperture in the 

 middle part is oval, but terminates upwards, in a considerable groove, 

 which runs between the right lip and the body of the shell ; and down- 

 wards, in a short reflected canal. A thick projecting fold runs up from 

 nearly the middle of the lip, and is inserted into the middle of the next 

 spiral turn. 



Three species have been found in the environs of Paris : C, harpa- 

 formis, C. cancellata, and C. carinata. 



The fossil shell, I believe from France, Plate V. Fig. 23, is perhaps 

 one of the most singular with respect to its mixture of characters. 

 Viewed at its back, it has the general appearance of a shell of the genus 

 Harpa; but in its front, its summit, its long slightly dentated aperture, 

 plaited columella, and widely extended left lip, show its most proper 

 place to be under the genus Cassis, notwithstanding that the inferior ter- 

 mination of the aperture, is that of a buccinum, instead of the short 

 reflected canal of cassis ; and that it has the flat broad columella of Buc- 

 cinum patulum, Linn, or Pur pur a patula, Lam. 



This shell agrees, in some of its anomalies, with the description of. 

 Valuta depressa, Lam. ; but it seems to differ from that shell, which, how- 

 ever, I have not seen. 



XXVII. Strombus: A slightly ventricose univalve, terminating at its 



