A. JEJ. Yerrill — Revision Getiera and Species of Starfishes. 205 



Adambulacral plates are narrow and usually have only two furrow 

 spines; several other pairs are borne on the actinal side of each plate. 



G. 2yilulatus Sladen also belongs to this restricted gi-oup. 



G. peclicellaris Per., from Cape Horn, is placed as a synonym of 

 mericUonalis Smith by Leipoldt, as are, also, G. Grayi (Bell) and 

 G. pilidatus Sladen. All the species are Antarctic. 



Odontaster Verrill. 



Odontaster Verrill, Amer. Journ. Science, xx, p. 403, 1880. Proc. U. S. Nat. 



Miis., xvii, p. 262, 1894. Araer. Journ. Sci., xlix, p. 136, 1897. 

 Gnathaster Sladen (pars), Voy. Challenger, vol. xxx, Asteroidea, p. 285, 1889. 



Perrier {pars), Exp. Trav. et Talism., p. 244, 1894. 

 Odontaster Bell {pars), Proc. Zool. Soc. London, p. 260, 1893. 



A single, odd, hyaline, recurved movable spine on the apex of 

 each jaw. Dentary plates large, separated by an open, fusiform 

 space covered by membrane. Abactinal surface covered with ele- 

 vated, convex or clavate paxilliform plates, or parapaxillae, which 

 usually bear clusters of elongated spinules, like true paxillfe ; their 

 bases are stellate; upper marginal j^lates are usually finely spinulated. 



Lower marginal plates and actinal plates are covered with acute, 

 more or less elongated spinules. 



Papular pores are generally large and placed singly in the angles 

 around the radial paxillw. The I'adial abactinal plates form more 

 or less evident obliquely transverse rows and extend nearly or quite 

 to the apical plate. 



The odd interradial marginal plate is usually triangular or wedge- 

 shaped. Simple pedicellarise occur rarely. 



The adambulacral plates usually bear several rows of spines ; 

 usually three or four in the furrow-series, rarely but two. 



The species, so far as known, are from the North Atlantic. 



The open suture between the dentary plates of the jaws ; the 

 movable hyaline spine, attached only by its base, at the apex of the 

 jaw, together with the very spinose character of the abactinal pax- 

 illfe and marginal plates, separate this genus from its allies. The 

 marginal plates are also larger than in most of the other groups, 

 and the adambulacral plates bear usually three or four spines in the 

 furrow-series. 



A reexamination of the numerous specirfiens of this genus for- 

 merly collected by the U. S. Fish Commission Steamer Albatross, off 

 our coast, convinced me, several years ago, that two species were 

 comprised under the name of O. hispidus in our earlier lists, and 



