50 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The six new species of Charitometridae in the Siboga collection were described 

 on April 13; these were: 



Pachylometra crassa. Glyptometra timorensis. 



Pachylometra helius. Strotometra priamus. 



Pachylometra fragilis. Strotometra ornatissimus. 



Eleven new species of the families Calometridae and Thalassometridae were 

 described on April 23; these were: 



Neometra sibogae. Thalassometra margaritifera. 



Calometra diana. Thalassometra perplexa. 



Pterometra venusta. Crotalometra sulcata. 



Thalassometra marginalis. Crotalometra vera. 



Thalassometra magna. Cosmiometra helene. 



Stenometra acuta. 



Neometra, used as a generic name in the description of Neometra sibogae and 

 appearing in the text in combination as Neometra multicolor, is new. 



A paper on the crinoids of the Solomon Islands appeared on April 26, and another 

 on a small collection from the Indian Ocean on July 10. In the latter the following 

 new species are described : 



Zygometra andromeda. Oligometra intermedia. 



The following nomina nuda occur: 



Heterometra pulchra. Psathyrometra major. 



Prometra brevicirra. Psathyrometra inusitata. 



The generic name Prometra is new. 



Eleven new comatulids from the Siboga collections belonging to the families 

 Himerometridae, Mariametridae, and Colobometridae were described on June 29. 

 These were: 



Amphimetra propingua. Cyllometra gracilis. 



Selenemetra tenuicirra. Decametra mylitta. 



Mariametra tenuipes. Prometra laevipinna. 



Mariametra tuberculata. Prometra minima. 



Dichrometra tenuicirra. Prometra parva. 



Oligometra marginata. 



Decametra mollis, which is compared with D. mylitta, is a nomen nudum. 



Included in the collections made by the German South Polar (Gauss) Expedi- 

 tion was a large series of the pentacrinoid young of Promachocrinus kerguelensis. 

 A preliminary study of these and of other pentacrinoids at hand, especially penta- 

 crinoids of Comactinia meridionalis, showed that the so-called anal in the pentacrinoid 

 larvae of the recent comatulids is in reality the radianal of the fossil forms. Anal x 

 is represented in the pentacrinoid larvae of the comatulids by a posterior interradial 

 which gives rise to an additional post-radial series, as in Thaumatocrinus renovatus 

 and in six-rayed specimens of other species, or by a minute plate which is quickly 

 resorbed; in the recent forms it is repeated in all the interradial areas. Thaumato- 



