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the Eocene in England and the Paris basin. With a single 

 exception all the species which form the fauna of Кар Dalton 

 seem to be either identical, or at any rate closely connected with 

 species which occur in the English or North-French Eocene. 

 An exception to this is perhaps formed by the species which 

 I have mentioned under the designation of Cryptodon • cfr. 

 unicarinatus Nyst.; but as will be seen from this designa- 

 tion the specimens in question do not quite agree with the 

 Cr. unicarinatus Ntst. However I have not seen any other 

 species described to which they have so great a resemblance 

 as to this Middle Oligocène species. Besides this one all the 

 other determinable species which I have mentioned from Кар 

 Dalton are represented in the West-European Eocene: from this 

 must perhaps be excepted one of the crustaceans viz. Coeloma 

 bicarinatum n. sp. 



There seems to be some reason for drawing a parallel 

 between the Coeloma-bed, and the London Clay, not only on 

 account of these two deposits having a pétrographie resem- 

 blance (brown or greyish brown clay with calcareous concre- 

 tions), but also because there seems to be a certain resem- 

 blance in their fauna, as far as the material from Кар Dalton, 

 which is so poor with regard to species, will permit of com- 

 parison. I do not attach any importance to the fact that wood 

 perforated by Teredos is common in both formations, as this 

 phenomenon is of very frequent occurrence also in other Tertiary 

 deposits. The occurrence of Hojdoparia groenlandica n. sp. 

 seems to me to be of importance; this species is veryv 

 closely related to, if not identical with, the H. gammaroides 

 Bell from the London Clay of Sheppey. Something the same 

 is the case with the Modiola found at Кар Dalton, which is 

 certainly closely related to M. simplex J. Sow. found in the 

 Bognor Beds, that is, in a deposit of the same period as the 

 London Clay. To the other crustacean from Кар Dalton, 

 Coeloma bicarinatum n. sp., 1 have not found any corresponding 



