JAPANESE ASTEROIDEA. 59 



suivants. Ou n'a pas sigualé jusqu'ici de pedicellaires cliez le Ctenodiscus, 

 qui en x^araît complètement clépom-vu, comme VAstropeden. 



"Le Ctenodiscus corniculatus est mx animal des mers du Nord." 



D'Ueban mentions tliis species from Barents Sea and says ['80, p. 256], 

 " Ctenodiscus crispatm was also very generally distributed at all depths from 

 62 to 210 fathoms." According to Ludwig it is also mentioned by Veeeill 

 ['80] and Stuxbekg ['80]. 



Duncan and Sladen give a veiy good description of tliis species together 

 with a comprehensive list of previous references ['81, p. 49] : 



" Ctenodiscus corniculatiis (Linck), Pereiee. Plate m, Figs. 17-20. 



(References omitted.) 



" Body depressed and goniodiscoid in outline ; radii five in nmnber, 

 with the arm-angles well rounded ; proportion of greater to lesser diameter 

 2:1. The calcareous elements of the abactinal smiace form a compact 

 network, similar to Astropecten, in which the interspaces are but very small. 

 A gi-eat number of small closely-^^laced paxillge are borne upon this frame- 

 work, each canying 5-10 roimd, blunt spiuelets, the whole so densely 

 crowded together that the sx^inelets are normally directed upward from the 

 pedicle. The abactinal surface is frequently x>^^^ecl up and more or less 

 convex in jarofile (owing probably to the quantity of sand or clay with which 

 tills Starfish fills its stomach) ; whilst a small x>e9,k-like protuberance rises 

 from the centre, around which the x)asill9ß rax)idly diminish in size. The 

 sides of the disk are perj^endicular, and formed of two series of marginal 

 j)lates — one ventral, the other dorsal. Each dorsal plate is ankylosed to a 

 coiTesponding ventral x)late — the -paUx thus formed being separated from the 

 neighboming pair on either hand by a deej) furrow, which follows the lateral 

 sutm-e of the plates, the margins being fringed with a series of fine, compress- 

 ed, ciHa-like spiuelets, which arch over the fmTOw. !Each of the dorso-lateral 

 plates bears a small compressed, but jîointed, sx)inelet, wliich stands erect on 

 its upper margin ; and the lower or ventro-lateral series likewise carry a 

 similar sx)inelet, which is placed near the junction of the ventral and dorsal 

 plates, and projects at right angles to the side waUs of the test. The last 

 or tenninal dorso-lateral x)lates of each side of a ray are ankylosed together. 



