280 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 22, 



P. crassus, Cyprina rotundata, Cytherea IcBvigata, Cardita Oma- 

 liana. Valuta Rathieri, &c. Dr. Satidberger makes out no less than 

 sixty-three species common to Weinheim and the Limburg series. 

 A large proportion of these shells are evidently much water-worn, 

 and many of the bivalves have been perforated by boring animals. 

 From this it might, perhaps, have been inferred that they had been 

 washed in vrith considerable violence, and drifted into particular 

 places as dead shells. But the occurrence of Sharks' -teeth, which 

 in some localities are very numerous, shows that this region must 

 have been for a long time an arm or basin of the sea inhabited by 

 marine animals until the brackish nature of the water interfered with 

 their existence. 



The beds immediately overlying the Marine Sands, while still con- 

 taining many truly marine species, show a decided commencement of 

 a brackish-water fauna, and this character increases as we ascend to 

 the Cerithium and Littorinella limestones. The following is the list 

 of fossils hitherto found in the Lower blue Brown-coal Clay or 

 Cyrena-marl. 



Table II. 



Fossils of the Cyrena-marl, or blue Brown-coal Clay. 



Saxicava, sp. 



Solecurtus, sp. 



Mya pusilla, A. Braun. 



Corbulomya polita, A. Braun, 



triangula, Duch. 



Tellina faba, Sandb. 



Bornia, sp. 



Cytherea Bosqueti, Heb. 



incrassata, Sow. 



Cyrena subarata, Bronn (very common). 



Cardium scobinula, Merian. 



Pectunculus crassus, Phil. 



Nuciila piligera, Sandb. 



Leda Deshayesiana, Duch. 



Tichogonia clavata, Krauts. 



Mytilus (afF. M.gallo-provincialis, Lam.) 



• Faujasii, Brongn. 



Avicula ? trigonata, Lam, 

 Perna Soldanii, Desh. 

 Ostrea cyathula, Lam. 



callifera, Lam. 



var. j8. minor. 



Natica glaucinoides, Sow. 

 Trochus rhenanus, Merian. 

 Littorinella Draparnaiidii, Nyst. 



obtusata, A. Braun. 



acicula, A. Braun. 



helicella, A. Braun. 



gibbula, A Braun. 



angulata, A. Braun. 



lubricella, A. Braun. 



compressiuscula, A. Braun. 



acuta, Desh. 



Nematura grauulum, A. Braun. 

 Rissoa plicata, Desh. 



nitida, Grat. 



Scalai-ia (aff. S. reticulata, Phil.). 



Littorina moguntina, A. Braun. 

 Melania oviforrois, A. Braun. 



pemodosa, Sandb. 



Cerithium incrustatum, Schloth. 



var. a. elongatum, Sandb. 



j3. Meriani, A. Braun. 



margaritaceum, Brocchi. 



var. ct. calcaratum, Grat. 



/3. incrassatum, Grat. 



pUcatum, Lam. 



var. a. crassum, Sandb. 



/3. intermedium, A. Braun. 



y. Galeotti, Nyst. 



creniferum, Desh. 



■ abbreviatum, A. Braun. 



, sp. uncert. 



Chenopus tridactylus, A. Braun. 

 Typhis cuniculosus, Duch. 

 Murex conspicuus, A. Braun. 

 Pleurotoma belgicum. Gold/. 



subdenticulatum, Miinsf. 



Buccinum Cassidaria, Bronn. 



, sp. incert. 



Mltra perminuta, A. Braun. 

 Bulla ? concinna, Wood. 

 Planorbis pseudaramonius, Voltz. 

 Limnaeus, spec. 2 uncert. 

 Helix, sp. (aflf. H. lacticina, Ziegl.) 

 Serpula sinistrorsa, Sandb. 

 Balanus, sp. 2. 

 Cytheridea Miilleri, Miinst. 

 Sphaerodus lens, Ag. 

 Lamna cuspidata, Ag. 



contortidens, Ag. 



Zygobates, sp. 

 Anthracotherium alsaticum, Cuv. 



