44 BULLETIN 82, XJNITED STATES NATIONAL MUSEUM 



species P ruberrimus, was described, and on January 11, 1911, another new genus of 

 stalked crinoid, Thalassocrinus, with the type species Th. pontifer, related to Gephy- 



roerinus. , • ^ i i i i. t 



In 1906 Mr. Henry W. Nichols had published an analysis ot the skeleton ol a 

 specimen of Metacrinus rotundus, in which he found 1 1 per cent of magnesium car- 

 bonate. This relatively high percentage of magnesium carbonate had attracted my 

 attention, and I sent specimens of Metacrinus rotundus and Heliometra glacialis var. 

 maxima to Prof. F. W. Clarke, of the United States Geological Survey, for analysis 

 to verify Nichols' figures. The results of the analyses were published by myself 

 on January 11, 1911. 



On February 15 the third paper on the crinoids collected by the Albatross in 

 Philippine waters appeared. In this paper 59 species were recorded, of which 24 

 were described as new; the latter were: 



Comissia dumetum. Asferometra cristata. 



Comissia hispida. Cosmiometra philippinensis. 



Comasterjruticosus. Crotalometra propinqua. 



Comaster (f) horridus. Crotalometra infolix. 



Comaster (?) scitulus. Thalassometra hirsuta. 



Zygometra pristina. Stenometra cristata. 



Catoptometra ophiura. Pachylometra septentrionalis. 



Selenemetra viridis. Pachylometra luna. 



Epimetra nympha. Pachylometra selene. 



Oligomefra gracilicirra ornata. Chlorometra robusta. 



Calometra alecto. Tridometra melpomene. 



Asterometra magnipeda. Toxometra pauper a. 



Psathyrometra parva. 



One of the above, Pachylometra septentrionalis, is from southern Japan and is 

 the specimen recorded in the report on the Owston collection under the name of 

 Charitometra distincta. 



The new genera described were : 



Selenemetra (genotype Selenemetra viridis, sp. nov.). 



Epimetra (genotype Epimetra nympha, sp. nov.). 



Toxometra (genotype Toxometra paupera, sp. nov.). 



The very peculiar articulation between the ossicles of the IBr series in Zygometra 

 pristina was described m detail. 



On March 15 there appeared a memoir- on the recent crinoids of the coasts of 

 Africa based upon a review of all the African material in the European museums, 

 as well as upon a compilation of all the published records. In the introduction the 

 history of the development of the African fauna is traced in detail and the zoogeo- 

 graphic aspects of the region are explained. 



The African crinoid fauna falls into five divisions, as follows: 



1. The European division, including the Mediterranean coast and the northwest 

 coast of Morocco, and Madeu-a; this falls mto two subdivisions: 



(a) The Mediterranean subdivision, comprising the coast of the Mediterranean, 

 and 



