REPORT ON THE ASTEROIDEA. 



311 



Clwrology of the Genus Paragonaster. 



a. Geographical distribution : — 



Atlantic : One species between the parallels of 0° and 10° N. 



Paragonaster cylindratus, near the Equator, due south of the Cape 

 Verde Islands. 



If Pentagonaster elongatus, Perrier, ultimately proves to be a Para- 

 gonaster, as I suspect, it will give two species to the Atlantic, and 

 will extend the range of the genus northward to about the fortieth 

 parallel, or perhaps a little further. 



Eastern Archipelago : One species between the parallels of 0° and 10° S. 



Paragonaster ctenipes, in the Banda Sea, between the Ki Islands 

 and Banda Islands. 



fi. Bathymetrical range: 140 to 1850 fathoms. 



As known at present, Paragonaster cylindratus is only found in the 

 Littoral zone, whilst Paragonaster ctenipes is confined to the Abyssal zone. 



•y. Nature of the Sea-bottom : Paragonaster ctenipes inhabits a ground of Blue mud ; 

 Paragonaster cylindratus one of Globigerina ooze. 



Chorological Synopsis of the Species. 



1. Paragonaster ctenipes, n. sp. (PI. LI. figs. 5 and 6 ; PL LIII. figs. 1 and 2). 



Rays five. E = 48 mm. ; r = 12 mm. R = 4r. Breadth of the ray midway between 

 the centre and the extremity, 4*5 mm. 



Bays elongate, slender, tapering towards the extremity, rather fiat and thin, the trans- 

 verse section having a vertically depressed oval outline. Interbrachial arcs wide and 

 faintly flattened. Rays very flexible in a vertical direction. 



The marginal plates are very broad, and limit the comparatively small and regularly 

 pentagonal paxillar area of the disk. The supero-marginal plates are thirty-eight to forty 

 in number from the median interradial line to the extremity. Those on one side of the 



