598 Mr. W. K. Fisher — Notes on Asteroidea. 



Coelasterias, Verrill*. — Type, C. australis, Venill. Dr. 

 Koeliler {loc. cit. p. 91) found great difficulty in obtaining 

 information concerning this genus for purposes of comparison. 

 1 iiuve studied a specimen of C. australis, the only known 

 species, from Christchurcli, New Zealand. Tlie structure of 

 the ray is so similar to that of Stichaster striatt/s, Miiller & 

 Troscliel [auraittiacus, Moyen, nee Linnaeus], that Cuelasterias 

 might be described as an eleven-rayed /Stichaster striatus. 

 There are the same broad carinals and superomarginals with 

 transverse series of granules ; the same small interomarginals 

 on the actinolateral border, with much coarser granulifonn 

 spines or tubercles in oblique series (frequently two to a 

 plate) ; the same series of actinal spines that sometimes 

 appear to be part of the inferomarginal armature. The 

 adambulacral armature is diplacanthid or irregularly dipla- 

 caiithid and monacanthid. In the specimens of striatus 

 which I have the armature is diplacanthid and triplacanthid, 

 and only rarely monacanthid. On account of the number of 

 rays, the oral angles are narrower than in striatus, and the 

 adoral carina is much longer. The interbrachial septum is 

 stoutly calcified. 



In the absence of any differential structural characters, I 

 think that Coelasterias australis should be regarded as an 

 eleven-rayed species of Stichaster, typical in all respects. 



Summarij. — Two new genera of Asteriidge are charac- 

 terized — Lysastrosuiua, type L. uutiiosticta, sp. n., Irom 

 Mororan, Hokkaido, Japan; Koehltr aster, type Auasterias 

 octoradiata, Koeliler, from South Georgia. Evidence is 

 submitted for considering Lysasterias, Fisher, the correct 

 name for Anasterias, auct., nee Perrier, and for regarding 

 Piiedasterias, Verrill, a synonym of Lysasterias, Farastich- 

 asi^r, Koehler, a synonym oi Spurasteri'ts, Perrier, Stichoiella, 

 Koeliler, a synonym of Calvasterias, Perrier, and Coilasterias, 

 Verrill, a synonym of Stichaster^ Miiller & Troscliel. 

 Anasterias lysasteria^ Verrill, for Anasterias perrieri, 

 Studer, is shown to be superfluous. 



Pacific Grove, California. 



* Trans. Conn. Acad. Sci. 1839, vol. i. part 2, p. 247. 



