JAPANESE ASTEÜOIDEA. 583 



armatm-e tliere are 3 to 6 fiuTow-spines (usually 5) on eacli plate, the outer 

 I'ow being extremely irregular and poorly dereloped, over a large part of 

 the arms it seems to disapi>ear completely. 



" Dr. Sluiter has pointed out how impossibh» it is in this genus to 

 rely on sliape for specific diagnosis ; and in this species, at any rate, this 

 chai-acter dej)ends almost entirely on the mode of preservation. During life, 

 especially Avhen left chy on the reef at low-tide, the outline may alter con- 

 siderably, and, if placed on a flat sm-face with the actinal side downwards, 

 the upper side Avould flatten out over the edge, so that the ambulacral 

 f lUTOw would appear confined to the lower side (cf. C. acntispinosa Bell) ; 

 also when specimens are placed in a basin and spirit is poured over them, 

 the lower surface (abactinal or actinal) AA'ill often accommodate itself to the 

 sliape of the Ijottom of the vessel. Il + r=:195 mm." 



As late as 1903 this species is mentioned by BelIj [:03, p, 245] from 

 Zanzibar under the name of " Cvlc'da 2^ntangularis, Geay." 



Ludwig [:05, p. 156] mentions si^)ecimens of this species from the 

 following locahties : one specimen from the reef near Papeete, Society Is- 

 lands, Septeml)er 2G, 1899 ; one specimen from the reef near Neiafu, Yavau 

 Island, Tongo Island, December 5, 1899 ; two specimens from the reef near 

 Ponape, Cai-oline Islands, Februaiy 12, 1900. He then adds the following 

 remark : " Die stark verdrückten Exemplare haben einen Dm'chmesser (R+r) 

 von 145-185 mm. und eine Höhe von 33-55 mm." 



FiSHER has the following remark ou C. arenosa [:0G, p. 1076]. " Tlûs 

 species was not taken by the Albatross expedition. The specimen which 

 Perkier described was collected by the expedition of Eydoux and Soixeyet 

 in the Bonite in 1837, * des îles Sandwich.' " In the same work lie pro- 

 poses a new generic name for Goniodiscus sebœ and describes it at length as 

 foUows [:06, p. 1070] : 



" Genus Goniodisddes, new name. 



" Goniodiscus Müller and Troschel, S^-stem der Asteriden, 1842, p. 

 57. Emended by Perrier, Revision des SteUérides, 1875, -g. 229. Type, 

 sens, nov., Goniodisddes schce. 



" Tliis genus is equivalent to that long known as Goniodiscus. Under 



