96 CONTRIBUTIONS 



Sowerby mentions two species of the genus Pileopsis, 

 from which this is separated, as being found in the Moun- 

 tain Limestone ; and Mantell one species from the Lower 

 Green Sand of Sussex. These are, I believe, all which 

 have been observed in Great Britain. M. Defrance men- 

 tions five fossile species of the genus Hipponix. M. Des- 

 hayes gives us twelve species of Hipponix in his Tertiary 

 Tables of these, eight are from Paris, nearly the whole 

 being found in the Eocene period. It has not, I believe, 

 been before noticed in this country. This genus was founded 

 by M. Defrance from the examination of the animal brought 

 by M.M. Quoy and Gamard, which proved to differ from 

 that of the Pileopsis (Lamarck).* Schumacher, in 1817, 

 separated the group from the Linnean Patella, and made 

 P. ungarica the type of a new genus under the name 

 Jlmalthea. 



GENUS INFUNDIBULUM. Montfort. 



I. trochiformis Plate 3. Fig. 76. 



Description. Shell orbicular, obtusely conical, slightly 

 tuberculated ; substance of the shell thin ; whorls all ob- 

 scure except the first. 



Diam. .3, Height 3-20ths, of an inch. 



Observations. Branders's figures of Trochus apertus (In. 

 tuberculatum, Sowerby), and T. opercularis^ resemble this 



* Manuel de Malacologie, &c. p. 507. 

 t Hampshire Fossils, plate I, fig. 1, 2, 3. 



