364 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOI,. 50 



Type of the genus. — Antedon angustiradia P. H. Carpenter, i! 



This genus includes a single species which was placed by Dr. 

 Carpenter in the "Savignii group," but which differs markedly from 

 all the others placed by him in that group. It is : 



Adelometra angustiradia (P. H. Carpenter) 



