Reports & Proceedings— The Royal Society. 325 



of giving a table of the geological range of Western American sharks 

 from Triassic to Pleistocene. 



4. Califoknian Eocene Molltjsca. — A number of new forms of 

 Eocene Mollusca have been described from the Marysville Buttes by 

 R. E. Dickerson in the Bulletin of the University of California, 1913. 

 The beds were deposited on a coarse-grained andesitic valley floor, 

 overlain by gravels and sands (lone Beds), which in their turn were 

 capped with andesitic mud-flows, subsequently firmly cemented. The 

 fauna is considered to have accumulated in 100 fathoms under tropical 

 or sub-tropical conditions. 



5. EoRAMiNiEEEA OF SouTHEEN CALIFORNIA. — The Bulletin 513 of 

 the Department of the Interior U.S. Geological Survey, 1912, is 

 devoted to a description and illustration of the Pliocene and 

 Pleistocene Foraminifera from Southern California by Rufus M. Bagg. 

 Over a hundred forms are described in ninety-two pages of text, and 

 illustrated in twenty-eight plates by a series of excellent figures. 

 That the author knows his subject is evident from the paucity 

 of 'n.spp.' 



6. Bibliography of North American GEOLoer (Petrology and 

 Mineralogy) for 1911. — Ttiis useful work, compiled for 1911 by- 

 John M. Nickles, was published last year as Bulletin 524 of the 

 Department of the Interior U.S. Geological Survey. It contains 

 1,266 entries, and has a first-class analytical index. 



7. Palaeozoic Sediments. — In the Journal of Geology (Chicago) for 

 April-May, 1913, is a very suggestive paper by T. C. Brown on the 

 origin of certain Palaeozoic sediments. The author discusses the 

 conglomerates, the oolites, and the interbedded sands of the Cambrian 

 and Ordovician rocks of Center County, Pennsylvania. In the same 

 Journal E. S. Bastin has a paper on " Chemical Composition as 

 a criterion in identifying Metamorphosed Sediments", which may be 

 read in conjunction with the preceding. 



8. Miocene Fauna of Eggenburg. — Dr. F. X. Schaffer deals with 

 this interesting fauna in the Abhandlung der k.k. geologischen 

 Eeiehsanstalt, vol. xxii, pt. ii (November, 1912). The paper includes 

 the Gasteropoda, Cephalopoda, Crinoids, Echinoids, and Brachiopoda, 

 and is fully illustrated. The fauna is singulaily rich in Cerithium, 

 Turritella, and Patella, and the occurrence of several species of 

 Antedon is interesting. 



I.— The Royal Society. 

 June 5, 1913. — Sir Archibald Geikie, K.C.B., President, in the Chair. 

 The Croonian Lecture was delivered by Dr. Robert Broom, C.M.Z.S., 

 on " The Origin of Mammals ".^ 



An endeavour is made to trace the evolution of mammals from 

 Cotylosaurian ancestors through the carnivorous Therapsida. In 



^ The accompanying abstract has been furnished by the author. 



