16 



Bepoet of the State Geologist. 



Revision of the Sponges and Ccelenterates of the Lower Hel- 



derberg Fauna. 



Mr. George H. Girty, of Washington, has communicated an 

 interesting and important paper under the title, A Eevision of 

 the Sponges and Ccelenterates of the Lower Helderberg Fauna 

 of 'New York. 



In this paper the known species of the groups mentioned are 

 redescribed and some important additions are made of heretofore 

 undescribed forms. Opportunity is take a to elaborate certain 

 structures, as the genera Hindia and Receptaculites, some new 

 features of : significance with reference to the latter being brought 

 out. The following list of species considered will convey a con- 

 ception of the contents of the paper. 



JS. microporum, sp. no v. 

 S. Barretti, sp. nov. 

 S. consimile, sp. nov. 

 Clathrodictya Jewetti, sp. nov. 

 Duncanella rudu, sp. nov. 

 Streptelasma strictum, Hall. 

 Zaphrentis Roemeri, Edwards 



and Haime. 

 Favosites Helderhergice, Hall. 

 F. Conradi, sp. nov. 

 Alveolites explanatus, Hall. 

 Pleurodictyum lenticulare, 



Hall. 

 Striatopora Issa, Hall. 

 Cladopora Clarkei, sp. nov. 

 C Salli, sp. nov. 

 . Aulopora subtenuis, Hall. 

 A. Schoharie, Hall. 

 A. tuhulay Hall. 



seven plates of drawings, giving 

 illustrations of structural details 



SPONGI^. 

 Hindia. 



Hmdia sphcBroidalis, Duncan. 

 Lysactinella, gen. nov. 



JLysactinella Gehhardi, sp. 



nov. 

 L, perelegans, sp. nov. 



ISCHADITES. 



Ischadites squamifer. Hall. 

 Receptaculites. 



Receptaculites infundibulifor- 



miSy Eaton. 

 CCELENTERATA. 



Dictyonema crassum, sp. nov. 

 Monograptus Beecheri, sp. 



nov. 

 Syringostroma centrotum, sp. 



nov. 

 S. foveolatum, sp. nov. 



The paper is accompanied by 

 figures of all new species and 

 in the genus Receptaculites. 



Brachiopoda of Vol. VIII, Palaeontology of New York. 



The new species of Brachiopoda described in Palaeontology of 

 JSTew York, Yolume YIII, Farts 1 and 2, 1892-1894. 



During the progress of the work upon Yolume YIII of the 

 Palaeontology of New York, it became necessary to describe or 



