60 



shell was found in a stratum of dark pyritous clay, at Brentford, on the 

 premises of Messrs. Trimmers. 



Lamarck describes but one fossil species, H. mutica, as found near 

 Paris. 



XXVI. Cassis. A gibbose ventricose univalve ; the aperture longi- 

 tudinal and subdentated, and terminating in a short reflected canal. 

 The columella plicated in its lower part; and the left lip flattened, and 

 forming a ridge on the body of the shell. 



Cassis cari?iata, Lam. ; Buccinum nodosum, Soland. and Brander ; is a 

 beautiful fossil species of this genus. 



A very beautiful fossil shell is found in a hill in Arragon, at above a 

 hundred feet in height. The nodulous rugae, on the left side, at the 

 lower flattened part of the columella, the dentated right lip, the re- 

 verted sinus, and the globose cassideai form, determine its genus ; whilst 

 its transverse rounded ribs, and nodular risings on the upper part of the 

 body of the shell, mark its species as different from any recent shell with 

 which I have been able to compare it. It is about two inches and a half 

 in length. 



The hills of Tuscany also yield some fine specimens of this genus. 

 One of these, about half the size of the preceding fossil, possesses most 

 of its characters ; but its spire projects more, and is formed of six turns ; 

 and the mouth contracts, in its upper part, into a sinus, between the 

 body of the shell and the right lip. The surface of this shell is smooth. 

 A second of these Tuscan cassidites is still longer in its spire, which is 

 formed of seven turns> and is characterized by regular transverse circu- 

 lar markings. In a third, the surface is marked by lines similarly dis- 

 posed, but alternately larger and smaller ; and the teeth of the right 

 lip are very prominent and distinct. ,. The general characters of these 

 shelfs very much accord with Buc. recurvirostrum, Linn, as figured by 

 Lister, PL 1016, No. 75. 



These shells were found by Mr. Strange in the sandy hills of Tus- 

 cany; and were introduced, with some other curious fossils, in two 



