724 SCIENTIFIC EECORD FOR 1885. 



established: Troostoerinus WacJismuthi ; the new genus GucumuUtes, 

 with the following types : C. tuberculatus and C. tricarinatus ; the new 

 genus Cidarospongia, with the type C. Ella ; the new genus Ptychostylus, 

 with the types P. heterocostalis and P. subtumidus. The above new 

 genera are all placed in the Protista. Discina KeoJculc, Lepetopsis Par- 

 risM, Belleroplion Ourayensis, B. incomptus, B. nodocostatus, B. tenuilin- 

 eatus, B. rugopleurus. 



Hall, James. — Note on the Intimate Relations of the Chemung Group 

 and VVaverly Sandstone in Northwestern Pennsylvania and Southwest- 

 ern New York. Proc. A. A. A. S., vol. xxxiii, part ii, pp. 416-419. 

 1885. Salem. 



(Abstract.) Gives a list of the Waverly genera of fossils. Without 

 any apparent want of conformity the Waverly follows the Chemung, but 

 at the point in the section marked "Place of the Catskill" there is a hia- 

 tus which, in Eastern New York and Pennsylvania, is marked by the 

 presence of measures having a thickness of from 3,000 to 5,000 feet. 

 Therefore we bave a right to conclude that there has been a long inter- 

 val in time between the final deposition of the barren Chemung shales 

 and the fossiliferous Waverly sandstone, or that the deposition of the 

 estuary Catskill sediments has been going on simultaneously with the 

 open sea deposits of the Waverly formation. 



Hall, James. — Note on the Eurypteridse of the Devonian and Car- 

 boniferous Formations of Pennsylvania ; with a supplementary note 

 on the Stylonurus excelsior. Proc. A. A. A. S., vol. xxxiii, part ii, 

 pp. 420-422. 1885. Salem. 



The geologic range of the genus, so far as at present known, is from 

 the Clinton group, where we have an unj)ublished species (Eurypterus 

 prominens) — to the Coal Measures. Gives a tabular view of the geologi- 

 cal distribution of the family Eurypterdse in the United States. Gives 

 a note on the size and occurrence of Stylonurus excelsior, Hall. 



Hall, James. — Note on the Eurypterid?e of the Devonian and Carbon- 

 iferous Formations of Pennsylvania. 2d Geol. Surv. Pennsylvania., 

 Rep. of Progress P. P. P., pp. 23-39, pis. iii-viii, figs. 2-4, on pp. 25, 

 27, and 34. 1884. Harrisburg. 



Discusses the Eurypteridse, gives a tabular view of the geological 

 distribution of the family in the United States, and describes Eurypterus 

 Beecheri from the Chemung, E. stylus from the Alleghany River series, 

 and names and figures, but does not mention in the text, E. potens, pi. 

 iv, figs. 9 and 10. 



Hall, James. — Classification of the Lamellibranchiata. Bep. State Ge- 

 ologist for 1881, pp. 8-15, pis. i-xi. 1884. Albany. 

 The plates are intended to represent the characteristic generic forms 



and to convey in a measure some idea of the variety of forms embraced 



in each genus of Devonian Lamellibranchiat?f. 



