194 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 11, NO. 8 



developments and the axes of some of the larger folds in the area considered, 

 a structure and well map of the Petrolia field, and several curves illustrating 

 production, decline, etc. M. I. Goldman. 



GEOLOGY. — Preliminary report on the deposits of manganese ore in the 

 Batesville district, Arkansas. Hugh D. Miser. U. S. Geol. Survey- 

 Bull. 715-G. Pp. 32, pis. 3, figs. 4. 1920. 



The report contains a brief description of the rock formations and their 

 structure and discusses the principal geologic and economic features of the 

 manganese-ore deposits. Detailed descriptions of the numerous mines and 

 prospects are not given but are reserved for the final report. 



The manganese ores consist of oxides, and occur as irregular masses in the 

 nearly horizontal Fernvale limestone and Cason shale of Ordovician age, 

 and in residual clays. The oxides have been derived from manganese-bearing 

 carbonates and have been deposited by cold waters of meteoric origin in 

 limestone, shale, chert, sandstone, and clay which they have replaced. Most 

 of the masses of ore in the clays, however, are residual, having been freed 

 from the above-named formations by their decomposition. H. D. M. 



PALEONTOIyOGY. — The American species of Orthophragmina and Lepi- 

 docyclina. Joseph A. Cushman. U.S. Geol. Survey Prof. Paper 125-D. 

 Pp. 39-108, pis. 19, fig 1. 1920. 



Orbitoid Foraminifera, on account of their short stratigraphic range, have 

 proved to be excellent horizon markers, and because of their wide geographic 

 distribution, they are valuable in correlation. The genus Orbitoides, as now 

 restricted, is found exclusively in deposits of Cretaceous age ; Orthophragmina 

 appears to be confined to the Eocene; but Lepidocyclina ranges through the 

 upper Eocene and Oligocene. In the present paper are described all the 

 known American species of Orthophragmina and Lepidocyclina. This paper 

 should be looked upon as only a pioneer attempt at making a basis on which 

 a larger study of the American species can be built. R. W. Stone. 



PROCEEDINGS OF THE ACADEMY AND AFFILIATED 



SOCIETIES 



ENTOMOLOGICAL SOCIETY 

 333rd meeting 



The 333rd meeting was held October 7, 1920, at the Cosmos Club, with 

 President Walton in the chair and 25 members and 3 visitors present. 



The Treasurer, S. A. Rohwer, reported a subscription of $80.00 for the 

 purchase of food parcels to be sent to the two Austrian Entomologists who 

 had offered rare cavern Coleoptera in exchange for such parcels. The food 

 parcels had reached their destination, and a letter of thanks had been re- 

 ceived from one of the entomologists. 



Mr. L- H. Weld of the Bureau of Entomology was elected to membership 

 in the Society. 



The Corresponding vSecretary, Mr. Rohwer, reported that he had received 

 from the house committee of the Cosmos Club a notice of increase in the rent 

 of the hall. He had investigated other possible meeting places and reported 

 the most advantageous from the standpoint of both location and expense to 



