55 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



on the distribution of animals and its bearing on the peopling of America (March, 

 1912), Cambrian holothurians (August, 1913), the deep-sea and comparable faunas 

 (July,' 1913), nocturnal animals (February 25, 1914), and the geographical distribu- 

 tion of the Onychophora (January 4, 1915). 



Although no crinoids were obtained by the Hamburg expedition to West Africa, 

 the author was requested by Dr. W. Michaelsen to prepare an account of the West 

 African crinoid fauna for inclusion in the series of reports. This paper was published 

 in 1914. In it the Atlantic crinoid fauna was analyzed and its probable origin dis- 

 cussed in detail. The two genera represented in West Africa, Tropiometra and 

 Antedon, especially the latter, were treated at some length. A key to the species 

 of Antedon was given, followed by a list of these species with the range of each. The 

 species recognized were: 



Antedon mediterranea. Antedon bifida. 



Antedon adriatica. Antedon moroccana. 



Antedon petasus. Antedon diibenii. 



Antedon hupferi. 



Antedon moroccana, though not specifically designated as such, is a new species. 



Following a series of papers on the broader aspects of the study of the recent 

 crinoids — on the bathymetrical distribution of Arctic and Antarctic species (Feb- 

 ruary 4), on certain aspects of the bathymetrical distribution of the various species 

 (February 19), on the bathymetrical and thermal distribution of the comatulids 

 occurring on the coasts of China and Japan (March 19), and on the correlation of 

 phylogenetical specialization and bathymetrical distribution (May 4) — there was 

 published on May 16 a monograph of the crinoids of the Antarctic based upon the 

 material brought home by the German South Polar {Gauss) Expedition. 



In this monograph everything concerning the Antarctic crinoid fauna is included. 

 An historical introduction tracing the development of the knowledge of the Antarctic 

 crinoids is followed by a key to the Antarctic species and an annotated list of all the 

 Antarctic forms with the complete synonymy and range of each and detailed descrip- 

 tions of the specimens collected by the Gauss. 



The following new genus is described : 



Eumorphometra (genotype Euinorphometra concinna, sp. nov.). 



The following new species are described: 



Psathyrometra antarctica. Eumorphometra concinna. 



The subfamily name Ptilometrinae, first used in the discussion of the relation 

 between the recent crinoids and the temperature of their habitat, appears again, 

 but is still undefined. 



The systematic significance of the family Pentacrinitidae is explained in detail. 

 As here understood this family includes three groups — the pentacrinites, the thiol- 

 liericrinites, and the comatuUds; the last, though phylogenetically a minor offshoot 

 from the main stem and in every way parallel to the other two, has become so enor- 

 mously developed in the recent seas as to have acquired systematic interrelationships 

 between the included species in all respects comparable to those within a normal 

 class. 



