8 GEOLOGICAL MEMOIRS. 



this also Prof. Sandberger lias concluded after a careful examination 

 of the moUuscan fauna of the Mayence Basin. Six species of 

 the Mayence Bryozoa, all undescribed, could be determined; they 

 are — Cellepora lobato-ramosa, Hornera sparsa, Radiopora Sand- 

 hergeria, Defrancia monosticlia, Eschara tetrastoma, and Bicupulana 

 lenticular is ; the last being the type of a new and very interesting 

 genus. [Count M.] 



On the Corals and Brtozoa of the Upper Oligocene Strata of 

 Germany. By Professor Reuss. 

 [Proceed. Imp. Acad. Vienna, December 15, 1864.] 

 Only 7 species of Corals (3 Caryophyllidece, 3 Tw^hinolince, and 1 

 Madrepora) are known to occur in these strata ; and of them, only 

 Caryophyllia gramdata (rarely completely preserved) is either widely 

 diffused, or abundant in individuals. SphenotrocJius infermedius 

 ascends to the Crag of Suffolk and Antwerp. Gryptaxis alloporoides 

 occurs chiefly in the Lower Oligocene, only a few individuals range 

 upwards into the Upper Oligocene. The other species, one of them 

 of the new genus Brachytroehus, are of very rare occurrence ; so 

 that the Corals do not distinctively characterize the Upper Ohgocene 

 fauna. The Bryozoa number already 73 species, and a thorough 

 investigation of each locality may add still more to them. The 

 number of species in each locality is distributed thus: — Astrupp, 37; 

 Luithorst, 28 ; Biinde, 16 ; Klein-Preiden, 15. The other locahties 

 have hitherto proved rather unproductive. Of these 73 species, 53 

 are Cheilostomata, and 20 are Cydostomata. As to the families, their 

 distribution is thus : — Memhraniporido}, 22 ; Escharidce, 21 ; Cerio- 

 poridm, 8 ; Celleporido}, 4 ; Salicornaridce, 3 ; Selenariadce, 2 ; Vin- 

 cularidce, 1 ; Grisideoi, 1 ; Ttdndiporidce, 1. The genera richest in 

 species are — Lepralia, 19; Eschara, 16; Idmonea, 4; Hornera, 4. 

 With the exception oi Salicornaria rhomhifera,(jio\d£. b^^.; Biflustra 

 clathrata, Phil. sp. ; Myriozoum punctatum, Phil. sp. ; Lumdites 

 Hippocrepis, P. A. Bom. ; Hornera gracilis, Phil. sp. ; and Spirapora 

 variahilis, v. M. sp. ; all the other species are but of scarce and local 

 occurrence. Thirty-three species (45 per cent, of the total) have not 

 yet been met with above or below the Upper Oligocene ; 21 species 

 are common to the Upper Oligocene and to the Middle Oligocene Sep- 

 tarian Clay ; 14 species descend into the Lower Oligocene ; 18 reach 

 upwards into the Middle Tertiaries. It is a new proof that a con- 

 siderable number of Bryozoa have passed through several di^^sions 

 of the Tertiary period. Professor P. A. Romer's assertion, that 

 each of the Tertiary species of Bryozoa is confined to only one sub- 

 division, and is characteristic of its fauna, ceases, therefore, to be 

 absolutely admissible. The Upper Oligocene Bryozoan fauna, in its 

 general features, as in those of nearly all its species, offers distinct 

 analogy with those of other Tertiary deposits, and possesses btit very 

 few striking forms ; so that the Bryozoa are of but hmited use for 

 characterizing and discerning Upper Ohgocene deposits. 



[Count M.] 



