650 Bett—On the Echinoderm Fauna of the Island of Ceylon. 
IV. ECHINOIDEA. 
28, PHYLLACANTHUS IMPERIALIS. 
Cidarites imperialis. Lamarck, Anim. s. Vert., ili., p. 54. 
Phyllacanthus imperialis. Brandt, Prod. descr. Anim., p. 68; Agassiz, Rev. 
Kch., p. 151. 
Mr. Alex. Agassiz, on whose authority this species is included among those of 
Ceylon, does not cite the collector by whom it was obtained or collection in which 
it is to be found, but in giving his list of littoral species found in “ Indian Ocean 
to Philippine Islands” (1. ¢., p. 235), he gives its distribution as ‘ Ceylon: Aru 
Islands.” Neither Dr. Ondaatje nor Prof. Haeckel collected the species. 
29, DIADEMA SETOSUM. 
Cidarites diadema. Lamarck, Anim. s. Vert., iii., p. 58. 
Diadema setosa. Gray, Annals Philosophy, xxvi. (n. s. x.), p. 426. 
Diadema setosum. A. Agassiz, Rey. Kch., p. 103. 
Great interest attaches to this well-known and widely distributed form, now 
that Herren Sarasin has discovered eye-spots on the integument, a full and well- 
illustrated account of which is to be found in Part 1. of their just published 
‘‘ Ergebnisse naturwissenschaftlichen Forschungen auf Ceylon” (Wiesbaden, 
1887). There is, apparently, a second species of Diadema at Ceylon, for the 
authors observed a form in which the eye-spots were not separated but formed 
continuous rows. 
30. ASTROPYGA FREUDENBERGI. 
Astropyga freudenbergi. P. & F. Sarasin, Ergebnisse naturw. Forschungen 
auf Ceylon, 1.,1., p. 16, pl. i 
Herren Sarasin, during their recent fruitful journey to, and stay in, Ceylon, 
acquired only one example of this remarkably fine form. As it was obtained after 
a high sea, it is possible that it comes from somewhat greater depths than most of 
the species. Its brilliant red colour, with its blue eye-spots, its large size, and the 
division of the naked interambulacral area into three bands, must make it an 
object which, if it be littoral in habit, will surely reward a careful search. 
31. CYANOSOMA URENS. 
Cyanosoma urens. C.F. and P. B. Sarasin, Zoolog. Anzeiger, ix., p. 80. 
From the short account given by Herren Sarasin this appears to be an 
Echinothurid; they direct especial attention to the poison apparatus formed by 
some of the spines. 
