A MONOGRAPH OF THE EXISTING CRINOIDS 51 



crinus renovatus is merely the young of Decametrocrinus abyssorum. The soUd plating 

 of the disk which appears in the young of certain forms concurrently with the disap- 

 pearance of the orals, quickly to be resorbed, is the transient vestige of the condi- 

 tion which developed into the solid dome of the Camerata. These conclusions were 

 published on July 19. 



On November 7 an account appeared of the crinoids of the Natural History 

 Museum at Hamburg, a very important collection containing the types of many 

 species described by P. H. Carpenter and by Hartlaub, the original of Lov^n's 

 Hyponome sarsii, many interesting specimens from Spitzbergen, the Magellanic 

 region and Ternate, and part of the old collection of the Museum Godeft'roy previously 

 studied by Liitken. The new species described were: 



Dichrometra flagellata var. afra. Petasometra helianthoides. 



Euantedon sinensis. 



The new genera established were : 



Petasometra (genotype Antedon clarae Hartlaub, 1890). 



Euantedon (genotype Antedon moluccana A. H. Clark, 1912). 



Actinometra belli P. H. Carpenter is transferred from Comanthina to Comaster. 



Antedon tenera Hartlaub, 1890, and Antedon reginae Bell, 1884, are placed in 

 the synonymy of Dichrometra gyges (Bell). 



Tropiometra macrodiscus (Hara) is recognized as distinct from T. afra (Hartlaub). 



The combination Solanometra magellanica appears for the first time. 



In April descriptions of the new species contained in the Siboga collection belong- 

 ing to the families Antedonidae and Atelecrinidae were published. These new species 

 were: 



Antedon moluccana. Psathyrometra inusitata. 



Compsometra iris. Psathyrometra anomala. 



Compsometra parviflora. Nanometra clymene. 



Compsometra longicirra. Trichometra delicata. 



Compsometra gracilipes. Trichometra brevipes. 



Iridometra (Eumetra) aphrodite. Thaumatometra alcyon. 



Iridometra gracilis. Thaumatometra thysbe. 



Toxometra purpurea. Atopocrinus sibogae. 



Psathyrometra major. Atelecrinus sulcatus. 



Psathyrometra minima. Atelecrinus anomalus. 



The new genus Atopocrinus (genotype Atopocrinus sibogae, sp. nov.) was described. 

 The separates of this paper were lost in the sinking of the Titanic. 

 In a paper published on November 19 attention was called to the apparent 

 occurrence of five distinct nodes or centers of abundance in the bathymetrical distribu- 

 tion of the recent crmoids which are in their distribution roughly inversely proportion- 

 ate to the decrease in temperature with depth. 



On the following day there appeared a description of the recent crinoids contained 

 in the collection of the Berlin Museum. In the introduction the history of the 

 collection is given together with a list of all the records published based upon the 

 included specimens. A complete bibliography is appended. 



