86 SPOLIA ZEYLANICA. 
much as in 7’. encrinus, but the two basal joints of the middle 
pinnules are conspicuously larger than the succeeding joints, 
and rather abruptly so ; these two joints are much wider than 
high. Arms stout at base, rather abruptly attenuate from 
near middle, probably about 60 mm. long, but none is 
complete. Colour, light brownish-white, without markings of 
any sort. 
Comparison of the single specimen on which the above 
description is based with typical specimens of carinata and 
encrinus shows it is neither of those species. Nor does it seem to 
be any nearer indica, so far as Mr. Clark’s fragmentary references 
to that species show ; but as he has examined the specimen and 
assures me it is indica, I have refrained from giving it another 
name. I have decided, however, to let the description I had 
drawn up stand. There are no data with the specimen. 
11. Astropecten andersoni, Sladen.—One small specimen. 
12. Astropecten indicus, Déderlein.—Four small specimens. 
13. Astropecten mauritianus, Gray.—Five medium-sized and 
large specimens. 
14. Astropecten zebra, Sladen.—Two small specimens. I 
agree with Bell that zebra is only a name for the 
young of some previously described astropecten, but 
I am not as yet prepared to assert which one. 
15. Lwidia maculata, M. & T.—Nine specimens, ranging from 
very small to very large; the smallest and three 
others have 8 arms each; the remaining five, 
including the three largest, have 7. 
16. Siraster tuberculatus, gen. et sp. nov. 
Generic diagnosis : Body stellate ; disk flattened, without 
secondary plates; primary plates not concealed by skin ; 
medioradial plates reaching to terminal plate of arm ; entire 
abactinal surface granulated ; papule single, distinct, each 
pore surrounded by a few granules, obviously larger than 
those covering the neighbouring plates. Inferomarginal plates 
without conspicuous spines, but those beyond middle of arm, 
each with a low tubercle or flattened tubercle-like spine on 
