BiBLKXiKAPiry. 49 



1890, 



33. James Hall. Fossil DictyospmujixhB of the Devonian and Carhf/ni- 



ferous Formations : New Forms of DiHi/ospon^/itlfP, front tJie rocks of 

 tJie Cliemmuj group. (Ninth Ann. Kept. N. Y. State Geol. pp. 5H-60; 

 Also pu1)lished in Bull. Geol. Soc. America, vol. 1, p. 22; and in 

 Forty-third Ann. Kept. N. Y. State Mus. pp. 258-2(32.) 



In this paper two new genera are introduced: A(Ti\(»i)icrYA and 

 Cryptodictya. The following species are described for the first time : 



Dictijopliyton sceptrum. D. tomaculmn. 



D. vascellum. I) ? {PhragmxxUclija) JIalli. 



D. Rttndalli. Actinodictija placenta. 



D. scitum. Cryptodictya Alleni. 



D. Amalthea. 



1892. 



34. Clemens Schluter. Protospongia rlienana. (Zeitsch. der Deutsch. 



Geolog. Gesellsch., pp. 615-618, figure.) 



Under the above name is described a species from the lower Devonian 

 Hunsriick slates, near Geniiinden, which is represented by a large, (£uite 

 incomplete specimen, showing quadrate reticulations in a diminishing series. 

 The quadrules appear to be formed by bundles of spicular filaments associated 

 with staiiractins. The species is undoubtedly a Dictyosponge but its generic 

 relations are uncertain. 



1893. 



35. N. H. WiifciiELL and C. Sciiuciiert. Sponges, Oraptolites and Corals 



from, the Ixyiver Silurian of Minnesota. (Extract from vol. iii. Final 

 Report of the Minnesota Geol. Surv. p. 75, pi. F, figs. 16-20.) 



Raujfella filosa, Ulrich, is redescribed and placed under the family 

 DicTYSPONGiDyE. It IS asscrtcd by Rauff that this is not an organism. 



36. Hermann Rauff. Palaeospongiologie, Part /, Lieferungen 1-4, pp. 



1-232. (Palaeontographica, vol. xl.) 



In this compi'ehensive undertaking, which plans an exhaustive treatise of 

 all fossil sponges, the author opens with an elaborate bibliography of the 

 subject, embracing 591 references up to the year 1892, following this with an 

 analysis of the work of those writers whose investigations have been of 

 especial influence in the study of these organisms. A long chapter on the 



