138 



and other parts ; and south of Piinfield in Swanage Bay, 

 in slaty clay, like that in the Isle of Wight, and accom- 

 panied, although sparingly, with similar shells. The lo- 

 calities given for the Cypris in France are Puy-en-Ve- 

 lay along with gypsum, under lava and over clay, rest- 

 ing upon granite, here it is accompanied by Planorbes 

 and CyclostomaB ; the Gypsum quarries of Aix in Pro- 

 vence along with Paludinae and Cyrenae ; and near Vichy 

 in the department of I'AUier *. 



Although there is a marine animal nearly allied to 

 Cypris, and perhaps not positively to be distinguished 

 except when recent, yet the occurrence of the fossil be- 

 fore us, in a series of localities always in company with 

 fresh-water genera, justifies the name which we, as well 

 as the French authors, have adopted. 



The same anomaly occurs in the series of fresh-water 

 strata (from the top of the Portland rock to the bottom of 

 the green sand) which containsthe Cypris that is met with 

 above the London clay ; that is, thin layers or beds of 

 oysters close to fresh-water shells ; and it will probably 

 be a long time before this fact is explained. This fresh- 

 water formation is an older one than is generally ad- 

 mitted, but it is not the oldest ; for the bituminous coal 

 series contains strata of fresh- water shells, besides others 

 in which are found marine reliquiae. 



* Ciivier & Brongniart, Descript, Geo), dcs Env. de Paris, pp. 260, 

 261,301. 



