14 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



In the generic diagnoses the articular faces of the radials were described in detail 

 in the genera Erythrometra, Thaumatometra, Coccometra, Leptometra, Hathrometra, 

 Trichometra, and Hypalometra. 



The pinnules of Calometra were said to be triangular in cross section and not 

 cylindrical as previously given; this was determined only after the examination of 

 dried material. 



Antedon dubenii, previously placed in Antedon, is here stated to be merely the 

 young of Tropiometra carinata. 



Antedon tenuicirra is assigned to Thysanometra, and it is suggested that it is 

 possibly the young of T. tenelloides. 



Antedon compressa and A. orion, previously placed in Charitometra, are here 

 transferred to Thalassometra. Antedon flava of Koehler and A. porrecta of Carpenter 

 are also placed in Thalassometra. 



Antedon sdateri of Bell is placed hi Charitometra near C. inaequalis, and A. 

 magnicirra is assigned to Thalassometra. 



Isometra angustipinna is said to be without doubt the young of Antedon lineata 

 P. H. Carpenter, 1888 (not Antedon lineatus Pomel, 1887). 



The comatulids as a whole are considered as forming the group Comatulida, 

 which is divided into the following families : 



Uintacrinidae, including Uintacrinus. 



Comasteridae, including Comatula and Comaster. 



Zygometridae, including Eudiocrinus and Zygometra. 



Himerometridae, including Himerometra, Pontiometra, Cyllometra, and Oligometra. 



Tropiometridae, including Tropiometra, Asterometra, Calometra, and Ptilometra. 



Thalassometridae, including Poecilometra, Thalassometra, and Charitometra. 



Antedonidae (restricted), including Perometra, Erythrometra, Zenometra, Psathyro- 

 metra, Adelometra, Heliometra, Promachocrinus, Thaumatometra, Thysanometra, 

 Coccometra, Leptometra, Hathrometra, Iridometra, Trichometra, Bathymetra, Nano- 

 metra, Compsometra, Hypalometra, Isometra, and Antedon. 



Pentametrocrinidae, including Decametrocrinus, Pentametrocrinus, and Thauma- 

 tocrinus. 



A paper published on May 4, 1908, contained descriptions of two new stalked 

 crinoids from the Atlantic coast of the United States. These were 



Bathycrinus serratus. Rhizocrinus verrilli. 



Both of these had been mentioned by Verrill in 1885, and the latter figured, but 

 neither had been described. 



The upper portions of the columns of Bathycrinus eguatorialis and of B. carib- 

 beus were figured, and the relationship between Bathycrinus and Rhizocrinus was 

 discussed. 



After the return of the Albatross from her detailed investigations among the 

 Hawaiian Islands in 1902 the comatulids obtained, together with the starfishes and 

 ophiurans, were assigned to Prof. Walter K. Fisher of Stanford University, Calif., for 

 description. Learning of my interest in these animals, Professor Fisher most gen- 

 erously sent me the entire collection, which forms the basis of a paper published on 

 May 14, 1908. 



