204 A. JEJ. Verrill — Hevision Genera and Species of Starfishes. 



Acodontaster Ver., geu. uov. Type, G. elongatus Sladen. 



Gnathaster (pars) Sladen, Voy. Chall., xxx, p. 285, 1889. Perrier (pars), p. 



244 (1894). 

 Oclontaster (pcus) Bell, Proc. Zool. Soc. London, p. 261, 1893. Leipoldt, 



Zeit. wissenschaft. Zool., lix, p. 614, 1895. 



One odd median, recurved, hyaline spine* on each jaw, or angle of 

 the mouth-frame. The two dentary plates are closely united along 

 the suture. 



Actinal, marginal and abactinal plates are covered with granules 

 or short granule-like spinules. 



Abactinal plates have the character of pseudopaxilli^, or are not 

 truly paxilliform, nor much elevated. They form obliquely trans- 

 verse rows on the rays. Papular pores are large in the radial areas. 



The marginal plates decrease regularly in size distally. The adam- 

 bulacral spines are arranged in several series ; two of each series 

 usually are situated on each plate. 



Actinal plates form series in two directions. Adambulacral plates 

 usually bear only two spines in the furrow-series. Pedicellarise are 

 not found in the type. The distribution is Antarctic. 



The following species belong to this group. 



Acodontaster elongatus (Sladen, 1889). Off Marion I.; off Heard 

 I.; off Kerguelen I., etc., 50-150 fathoms. 



Acodontaster miliaris (Gray, 1847). New Zealand. 



Gnathaster Sladen (restr.). Type, G. meridionalis. 



Gnathaster (pars) Sladen, Voy. Chall., xxx, p. 285, 1889. Perrier (lycirs), Exp. 



Trav. et Talism., p. 244, 1874. 

 Odontaster (pars) Bell, Proe. Zool. Soc. London, p. 261, 1893. Leipoldt, Arch. 



wissen. Zool., lix, p. 614, 1895. 



A single hyaline recurved spine (movable ?) on each jaw. The 

 two dentary plates consolidated at the suture. 



Abactinal plates are elevated, convex or capitate, and with radial 

 basal processes. They are covered with a group of short spinules 

 or with prismatic granules. They extend to the apical plate. 



Dorsal marginal plates not very large, covered with granules or 

 with small short spinules, like the disk. Ventral marginal plates 

 and actinal plates covered with granules or minute spinules. 



* According to Sladen's description these spines, in his species, are more 

 closely united to the jaw than in Odontaster, and would hardly be movable. 

 In the latter they are only attached by their bases, at the apex of the jaw, and 

 are movable. 



