330 



s. GOTO 



])lns petites et munies d(! grainües jxiu nombreux, par les x^^^^^i^'^^ Maires 

 assez abondants et su montrant sur les plaques marginales dorsales et 

 ventrales, et enfin par l'armature des plaques adambulacraires. Je ne vois 

 aucune espèce dont ou puisse rapprocher le P. cuenotL II est complètement 

 different du F. jjw?v/??«s Alcock que ITnvestigator a rencontré : il s'en 

 écarte, eu effet par ses plaques marginales plus gi-andes, moins nombreuses, 

 et offrant toutes un espace central nu, ainsi que par ses pores très apparents 

 et très nombreux." 



Tlie facts mentioned beloAS' tend to lessen the differences between P. 

 arcuatus and P. cuenoti, but the latter appears to be a distinct species. 



FiSHEr. also refers this species to Mediaster and mentions the presence 

 of loDg and slender superambulacral plates and of the internal radiating 

 ossicles of the abactinal side already noted by Vereill as a characteristic of 

 Mediaster [Fisher : 11, p. 199, 205]. 



As this species is sufficiently well characterised by Sladen's description 

 m}' remarks will be confined to a few x^oints of difference, which are of some 

 systematic importance, presented by my specimens. 



I have three specimens, all from the neighbourhood of 

 Misaki, and from depths ranging between 480 m. and 560 m. 

 The measurements are as follows : 



The number of marginals is thus seen to be somewhat more 

 variable than in many other starfishes, the specimen with R = 58 

 mm. having less of tliem than the one in which R = 56 mm. 



The interradial areas of tlie abactinal side is depressed, and 

 Slàden thinks that this may indicate a certain capacity of infla- 



