52 GEOLOGICAL MEMOIRS. 



only a few remains of marine animals have found their way. From 



these we know : 



In Germany. In England. 



Genera. Species. Genera. Species. 



Plants 18 50 7 8 



Conehylise 17 82 15 33 



Crustacea 2 10 2 4 



Hexapod insects — — 48 60 



Fishes 8 14 (?) 14 27 



Reptiles (Chelonians and Saurians) 3 4 11 13 



In the North-German basin alone the freshwater shell Cyrena ap- 

 pears with 38 species, that is, 1*5 times as many species as now live 

 over the whole surface of the globe ; the freshwater genera Limnseus, 

 Planorbis, Paludina, Neritina, first occur genuine. On the whole, it 

 would now be difficult to find a distinct basin of water vrith 8 genera 

 and 14 species, or indeed with 14 genera and 27 species offish, or in 

 the limits of which 11 genera with 13 species of large reptiles of the 

 orders of the Chelonians and Saurians alone could be discovered, and 

 yet assuredly these numbers do not exhaust this very extensive basin. 



f2. The limited locality of Maestricht, so peculiar for its rock- 

 formation, whether we leave it in the white chalk or conjoin it with 

 the so-called Terrain danien, does not bespeak a longer interval than 

 the ' life of a species.' It has furnished, — besides remarkable reptiles 

 (Chelonians and Saurians), numerous conchylise, crustaceans and 

 foraminifera, — 9 genera with 19 species echinoderms, 4 genera with 

 8 species amorphozoa, and 11 genera with 51 species polyparise of 

 the groups of Anthozoa and Phytozoa, whereas Verany enumerates 

 for Nice only 8 genera with 23 species echinoderms (without the 

 Holothurise), and no calcareous polyps [??]. 



(s) r. Besides 13 species of fucoids, we are indebted to Monte 

 Bolca for 71 genera with 128 species of fish, all of the order of the 

 Teleostei, for which at Nice only 93 genera with 2/0 species would 

 remain. 



t. From the eocene deposits we would select the local freshwater 

 formation of Hilly, which numbers not less than 14 genera with 39 

 species of non-marine (Binnen) conchylise, among which are 8 genera 

 with 24 species of land conchylise, which can only have been washed 

 in accidentally from the bank, whereas the most careful examination 

 for a circuit of eight miles (4 Stunden) round Heidelberg has yielded 

 us only 90-100 species of non-marine conchylise, of which perhaps 

 the half are more or less common, the other half rare, or confined to 

 small localities. AVarm regions are not richer in non-marine con- 

 chylise than the temperate. The freshwater deposit, of about the 

 same age with the former, of Castelnaudary in the Aude, department 

 possesses, according to Marcel de Serres, the following fauna : — 



Genera. Species. 



Mammalia 3 5"| 



Reptiles 4 4 > 14:27; 



Non-marine conchylise .... 7 1 8 J 



