JAPANESE ASTEIIOIDEA. 521 



rouud-topped tubercles, those near the ambulacra and tlie oral angles being 

 largest and highest. 



"Inhab. Reef of Ooniaga. 



" This species is very distinct from the former^ \ and forms the pas- 

 sage to the genus Randasla, but there is a series of concave, minutely 

 X)orous spaces in place of the upper marginal plates." 



Randasla <jramäata first described by GfiAY is a young form of this 

 sx)ecies (Hartlaub ['92, ^. 77] and Perkier ['76, p. 83]). The genus is cha- 

 racterised by Gray ['47, p. 195] as follows : 



" Randasia, Gray. 



" Body pentagonal, depressed, minutely granular ; back nearly flat, 

 minutely granular, reticulated, reticulations rather tubercular, interspaces 

 sunken (when dry) and covered with very minute close perforations. Dorsal 

 tubercles roundish, single, subcentral. Margins fm-nished with an upper and 

 lower series of oblong ossicules, the upper one narrower internally, with a 

 central series of tubercles, the lower ones oblong, close together and convex. 

 The oral surface protected by close, regular, squarish, convex ossicules, cover- 

 ed with short crowded granules. The ambulacral spines in rounded groups ; 

 the series of tubercles nearest the ambulacra larger, crowded, and placed in 

 groups of three or five, and those in the oral angles largest and flat-topped. 



" The genus diifers from Pentaceros in the back being flat, elevated, 

 and not angular ; it is in several respects intermediate between CulcUa and 

 Pentaceros.^' 



Two species are described, R. cjranulata and R. spinulosa. The former 

 is the species now under consideration, and is described as follows [ '47, p. 196] : 



" Randasla gramdata, n. s. 



" Body five-sided ; back minutely granular, with roundish convex sub- 

 conical tubercles in the reticulations ; the marginal plates fom'teen on e^ch 

 side, the upper ones with a central series of tubercles. 

 "Inliab. Reefs of Attagor, ToiTes Straits. 



" There are two specimens of this species in the British Museum, one 

 in a very bad state." 



1) CulcUa schmkleliana. 



