A MONOGRAPH OF THE EXISTING CRINOIDS 57 



A revision of the family Bourgueticrinidae is included in which the following 

 genera are recognized: 



Bathycrinus. Rhizocrinus. 



Ilycrinus. Bythocrinus. 



Monachocrinus. Democrinus. 



A key to these genera is given, and the range of each is discussed in detail. 



The family Plicatocrinidae, including the recent genera Calamocrinus, Ptilo- 

 crmus, Hyocrinus, Thalassocrinus, and Gephyrocrinus, is assigned to the order Ina- 

 dunata, and the reasons for this are set forth at length. A key to the recent genera 

 is given. 



The genus Promachocrinus is made to include the subgenera Promachocrinus, 

 Solanometra, Florometra, and Anthometra, and its relationships with Heliometra and 

 Cyclometra, as well as its probable origin, are discussed in detail. 



A list of the localities where species of Florometra have been collected, for the 

 most part previously unpublished, is given, and the bathymetrical, thermal, and 

 geographical distribution of the genus is considered. 



Keys to the genera of the subfamily Zenometrinae and to the five species of 

 Thaumatocrinus are included. 



The faunas of South Africa, southern Australia, the Arctic Ocean, the more or 

 less inclosed seas, and of the abysses are analyzed in their relation to the Antarctic 

 fauna, and the sub-Antarctic fossil crinoids are listed. 



After a series of papers of more or less general interest, on the relationship 

 between phylogenetic specialization and temperature among crinoids (June 19), on 

 the recent crinoids which are congeneric with fossil species (July), on the relation 

 between the maximum and the average bathymetric range and the mean and the 

 average depth of habitat (July), on the distribution of crinoids on the coasts of 

 Australia (1915), a phylogenetic study of the recent crinoids with special reference 

 to the question of specialization through the partial or complete suppression of 

 structural characters (August 19), and asymmetry among crinoids, the description 

 of the first New Zealand crinoid was published on February 24, 1916. This was: 



Comanthus trichoptera benhami. 



In this paper the common south Australian comasterid is mentioned under the 

 name of Comanthus (Cenolia) trichoptera. The name Cenolia is new, replacing the 

 name Bennettia, preoccupied. 



On March 4 seven new echinoderm genera were described, including the four 

 following crinoid genera: 



Comatonia (genotype Actinometra cristata [P. H. Carpenter, MS.] Hartlaub, 

 1912). 



Austrometra (genotype Oligometra thetidis H. L. Clark, 1909). 



Cotylometra (genotype Oligometra gracilicirra A. H. Clark, 1908) 



Daidalometra (genotype Antedon hana A. H. Clark, 1907). 

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