A. H. CLARK: THR CRINOIDS OF THE INDIAN OCEAN. 287 



ACTINOMETRA sp. 



Actinometra tridistichata Bell, MS. 



Actinometra sp. 1894. Bell, P.Z.S., IS04, p. 402. 



" Mention must also be made of an Actinometra to which I think it would be 

 wrong to give a specific name, so broken is it, but of which it would be more 

 wrong not to say .something. Ft will be remembered that the late Dr. H. Carpen- 

 ter divided tlie tridistichate species of this genus into those in which there is a 

 syzygy on the second brachial and into those that have it on the third. In the 

 specimen now before me there is no signs of any syzygy on either the second or 

 the third brachial." 



I examined this specimen at London and found it to be an example of the 

 Comaster gracilis described by Hartlaub in 1890. 



ANTEDON MOOREI. 



Antedon moorei 1894. Bell, P.Z.S., 1894, p. 401. 



"This species is probably most nearly allied to A. (i.e., Parametra) com- 

 pressa, P.H.C., but it has only faint spinous processes on the cirrus-joints. 

 Cirri 25 to 30, with 2.5 joints. Centrodorsal bare in the middle. No syzygies on 

 radials, distichals, or palmars. There may be post-palmars. The third brachial 

 syzygial; arm-joints iii-vi, squarish, the succeeding triangular, and the more 

 distal gradually overlapping. 



' ' Colour purpHsh, with the free ends of the arms white. 



" Macclesfield Bank, 13 fms. 



"The single specimen is a good deal broken, but it is interesting as belong- 

 ing to a series of the group of which Dr. Carpenter knew only one type." 



In the type specimen, which T examined at London, the cirri are XVIII, 21, 

 21 23, 25, 17 mm. long; the longest segments are about one third longer than 

 broad; the thirteen outer segments are slightly broader than long and hear 

 moderate spines. 



The thirty-two arms are 60 mm. long; the IIBr and IIIBr series are 2, and 

 are in close lateral apposition through lateral extensions. 



P. is the longest, long and evenly tapering as in Dichromefra protectus. 

 enlarged and slightly stiffened, with 16, 18, or 21 segments which become squarish 

 on the third and twice as long as broad distally ; the pinnule is about one third 

 longer than P, ; P; is similar, but not quite so long or so stout, and tapering 

 somewhat more rapidly; P., is about as long as P,. but is slightly stouter and 

 tapers less rapidly, its character being more like that of P.,; it has sixteen seg- 

 ments ; the following pinnules are small and weak ; P^ is considerably larger on 

 the outer than on the inner arms. 



This is an immature specimen of the species called sini.ilis bj' Carpenter; it 

 is rather doubtfully distinct from D. protectus. 



