8 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Charitometra (genotype Antedon incisa P. H. Carpenter, 1888) including 



Charitometra aculeata. Charitometra hepburniana. 



Charitometra angusticalyx. Charitometra inaegualis. 



Charitometra basicurva. Charitometra incisa. 



Charitometra brevipinna. Charitometra lata. 



Charitometra compressa. Charitometra orion. 



Charitometra distincta. Charitometra parvipinna. 



Charitometra flexilis. Charitometra patula. 



Charitometra garrettiana. Charitometra pourtalesi. 



Charitometra granulifera. Charitometra robusta. 



Charitometra tuberosa. 



Charitometra includes most of the species placed by Carpenter in the Basicurva, 

 Spinifera, and Granulifera groups not falling in the genus Thalassometra. 



Poecilometra (genotype Antedon acoela P. H. Carpenter, 188S) including 



Poecilometra acoela. Poecilometra scalaris. 



Poecilometra includes a species described in the Acoela group by Carpenter and 

 another described by the author in the Basicurva group. The inappropriateness of 

 the generic name is due to the fact that at first (before publication) it was applied 

 to the presumably homogeneous Acoela group as a whole, in which Antedon discoidea, 

 variegated in color, was the more distinctive species. When the close relationships 

 of Antedon discoidea with the Japanese forms which I had tentatively grouped under 

 the generic name Calometra were discovered, this species was removed from Poecilo- 

 metra, leaving Antedon acoela as the type. 



Calometra (genotype Antedon callista A. H. Clark, 1907) including 



Calometra bassett-smithi. Calometra multicolor. 



Calometra callista. Calometra propinqua. 



Calometra discoidea. Calometra separata. 



Calometra flavopurpurea. Calometra thetis. 



Calometra versicolor. 



The only species known to Carpenter was placed by him in the Acoela group; 

 another species was said to have been placed by Bell in the Spinifera group. 



Adelometra (genotype Antedon angustiradia P. H. Carpenter, 1888) including 



Adelometra angustiradia 



The genus Adelometra includes a species from Carpenter's Sarignyi group. 



Antedon as restricted and redefined, being now practically equivalent to Car- 

 penter's Tenella group with the addition of Antedon pumila and A. parvicirra from 

 the Milberti group, includes the following species: 



Antedon abyssicola. Antedon angustipinna. 



Antedon abyssorum. Antedon arctica. 



Antedon adeonae. Antedon bijida. 



Antedon adrestine. Antedon briseis. 



Antedon alternata. Antedon carpenteri. 



