CHAKACTERISTIC DEEP-SEA TYPES. - - OPHIURAXS. 109 



North of Cape Hatteras the species of starfish procured by the 

 " Blake " are identical with those described by Professor Verrill 

 from the dredsinQ's of the United States Fish Commission. 



O O 



I would only mention here, as the most interesting of the 

 species we found, ten-armed specimens of Brisinga coronata. 

 (Fig. 387.) This species forms the subject of an elaborate 

 paper by the younger Sars, and I have here reproduced one of 

 his figures. 



OPHIUKANS. 1 



Among Echiuoderms there are two families, the brittle-stars, 

 or Ophiuridse, and the branching-stars, or Astrophytidaa, which 

 are distinguished by a peculiar axis in the arms, made up of 

 articulated bones somewhat like vertebrae. The disk or body is 



Fig. 389. Ophiocreas spinulosus. 1. 



usually distinctly set off from the arms. These last contain no 

 prolongation of the central digestive cavity, as they do in the 

 starfishes proper. 



" Mr. Lyman has prepared the account of the ophiurans. 



