Brett—On the Echinoderm Fauna of the Island of Ceylon. 647 
indicate that the injury is directly due to an external enemy. It was to me a 
matter of peculiar satisfaction—having, in 1882, written, ‘It is not difficult to see 
that the result of such an injury might, of itself and by itself, be the production of 
two rays where one had previously existed, owing to increased activity, due to 
inflammatory action. A further result might well be a tendency, in a race of 
individuals of a certain species, to produce an irregular number of rays: 
occasionally, as in the case of Asterias polaris, this would be advantageous, and 
would become a constant arrangement”—to read in 1885 the following words 
of an accomplished pathologist:—‘‘In many cases where organs or sets of 
organs have undergone hypertrophy to such a degree that pathologists would 
regard them as abnormal, these exceptional conditions have been inherited, and in 
this sense pathology may be assumed to have played a part among the ordinary 
processes of evolution in producing rare peculiarities.” Cf. Mr. J. Bland Sutton, 
on ‘ Hypertrophy and its Value in Evolution,” P. Z. S., 1885, pp. 482-445. 
9, ScyTASTER VARIOLATUS. 
Asterias variolata, Retzius, Diss. sist. spec. Asteriar., p. 19. 
Scytaster variolatus. Miiller and Troschel, Syst. der Aster., p. 34; Perrier, 
Réy. Stellér., p. 159. 
10. FROMIA MILLEPORELLA. 
Asterias milleporella, Wamarck, Anim. s. Vertebr., i1., p. 565. 
Fromia milleporella. Gray, Ann. Mag. Nat. Hist., vi., p. 286; Perrier, Rév. 
Stellér., p. 173. 
11, FROMIA TUMIDA. 
Fromia tumida, Bell, P. Z. S., 1882, p. 124. 
This species, which was described by me in 1882, is not included in Dr. 
Walter’s later enumeration; but as he makes no reference to it, nor to the Paper 
in which it was published, I presume it escaped his notice. ‘The Museum owes 
its specimens.to M. Kelaart. 
12, OREASTER LINCKI. 
Asterias linet. De Blainyille, Dict. Sci. Nat., Ix., p. 219. 
Pentaceros muricatus. Perrier, Réy. Stellér., p. 239. 
Oreaster lincki. Bell, P. Z. S., 1884, p. 72. 
I think it is very probable that further search will be rewarded by the dis- 
covery of other species of Oreaster on the shores of Ceylon. 
