from the Kuolcers Stage in Esthonia. 335 



With the other species named by Bassler for this stage, this 

 makes a total of 56 species. 



In the British Museum, Geological Dept., there are of the 

 species of my collection which I found in the Kuckers stage, 

 named on the table (pp. 332 & 333), the following : — Proto- 

 crisina e.vigua, Ulrich, Regd. D. 29830 ; Pachydictya brf ar- 

 eata, Hall, Regd. D. 29838 ; Chasmatopora tenella, Eichu aid, 

 U^gd. D.2J)831j Batoston.a winchelli, Ulrich, Regd. D. 29834; 

 Bah stoma fertile circulare, Ulrich, Regd. D. 29835. The 

 other species that I found in the Kuckers shale and marl, 

 named on the table, are in my collection in the Geological 

 JMuseum of the University of Tartu. 



The mode of occurrence of the various species is remark- 

 able. In some places the fine delicate white skeletons of 

 diverse bryozoa are in great abundance ; locally they are 

 absent from the shale. In the bituminous or oil shale the 

 following abound : — Chasmatopora fureata. Pseudohomea 

 bifida, Protocrisiua exigua, Pachydictya elegans, P. (yclosto- 

 moides, P. kuclersensis, Graptodictya bonntmai. There is 

 an abundance of Tiepostomata in the shale and still more in 

 the marl or limestone, e.g.: Diplotrypa petropoldana, 

 Dianulites petropolitana, Hallopora dybovskyi, and various 

 species of Batostoma and Hemiphragma. 



EXPLANATION OF PLATE VII. 



Pachydictya kuckersensis, sp. n. 



Figs. 1-3. Outlines of zoarial fragments, nat. size. 

 Fig. 4. Portion of zoarial surface, X 12 diam. 

 Fig. 5. Tangential section of zoarium, X ] 2 diam. 

 Fig. 6. Transverse section of zoarium, x 12 diam. 



Pachydictya crassa, Hall. 



Fig. 7. Outline of zoarial fragment, Brit. Mus., Geol. Dept., D. 29832 ; 



nat. size. 

 Fig. 8. Portion of zoarial surface of the same specimen, x 7 diam. 



Nematopora bogoljubovi, sp. n. 



Fig. 9. Zoarial fragment ; holotype ; Brit. Mus., Geol. Dept., D. 29833 ; 



nat. size. 

 Fig. 10. Portion of zoarial surface of the holotype, X 13 diam. 



