206 VERRILL 



wide papular areas and numerous papulae. Papulae lacking on actinal 

 side, present between marginals. Adambulacral plates bear two 

 spines; none in the furrow. Pedicellariae unknown. Madreporite 

 an independent plate. 



PORANIOPSIS INFLATA Fisher. 



Alexaridroster inflates FISHER, op. cit., 1906, p. 300. 



Poraniopsis inflate FISHER, 191 it, p. 261, pi. LVIII, figs. 7, 70; pi. LXIII, figs. I, 

 2; pi. cxn, fig. i. 



Form stellate, with five short, thick, tapered rays. Radii of the 

 type, 23 mm. and 60 mm. ; ratio, 1 : 2.6. Dorsal spines large, 3 mm. 

 to 6 mm. high, acute, usually one at each angle of the large papular 

 areas, forming altogether about seven imperfect rows in the type, 

 not including the inferomarginals and those usually present on the 

 interactinal plates. Adambulacral spines two to a plate, grooved, 

 as are usually, also, the interactinal spines, when present. The 

 plates and spines are covered with thick membrane. 



Recorded by Fisher from seventeen localities, in 26 to 159 fathoms, 

 from Oregon to San Diego, California. 



It was not in the collections received from farther north. Dr. 

 Fisher described another form, from deeper water (334 to 600 

 fathoms), as P. inflata fie.vibilis Fisher. 



Genus Echinaster Miiller and Troschel ; includes Othilia Gray. 



Stellonia (pars) NARDO, Oken's Isis, p. 716, 1834. Agassiz, Prod., p. 191, 1835. 



Echinaster (pars) MULLER and TROSCHEL, Monatsber., Berlin Wiss. Akad., 

 April, 1840, p. 102; Wieg. Arch., 1840 (no* Gray); Syst. Aster., p. 22, 

 1842 (pars). 



Othilia GRAY, Ann. Mag. Nat. Hist., vi, p. 281, Dec., 1840; Synopsis Starfishes, 

 p. 12, 1866. Fisher, 191 ib, p. 260. 



Echinaster PERRIER, Revis. Stell. du Mus., Arch. Zool. Exper., iv, p. 364, 1875. 

 A. Agassiz, North Amer. Starfishes, p. 97, pi. x, 1877 (structure of skele- 

 ton). Viguier, Squelette Stell., Arch. Zool. Exper., vii, p. 123, pi. vii, figs. 

 1-7, 1878 (structure of skeleton). Sladen, Voy. Chall., Zool., xxx, p. 553, 

 1889. Perrier, Exp. Trav. et Talism., p. 146, 1894. 



Disk rather small. Rays five, of moderate length, rounded. 

 Larger dorsal and marginal ossicles strong, lobate, convex in the 

 middle, and having a central mammilla and pit for the attachment of 

 the usually solitary spine. The larger ossicles are united into reticu- 

 lations by small, rounded, connective ossicles, leaving large papular 

 areas; these may be intermarginal and often, also, interactinal. 



