320 THE VOYAGE OF H.M.S. CHALLENGER. 



to be identical with Actinometra jimbnata, as I have redefined it above. This example 

 was brought to the Paris Museum by Rousseau in 1841, and I found it bearing the 

 museum name Comatula coccodistoma ; but it differs from the other examples of Actino- 

 metra Jimbriata that I have seen in the interradial position of the mouth. The Copen- 

 hagen Museum contains three specimens which also seem to belong to this type. Two 

 are from Angio in Java, and have overlapping arm -joints ; while the third was obtained 

 by the " Galathea " at the Nicobar Islands, and has a less marked overlap. 



2. Actinometra coppingeri, Bell (PI. LX. figs. 1, 2). 



1882. Actinometra coppingeri, Bell, Proc. Zool. Soc. Lond., 1882, p. 535. 

 1882. Actinometra coppingeri, P. H. Carpenter, Ibid., p. 747. 



1884. Actinometra coppingeri, Bell, Bep. Zool. Coll. H.M.S. "Alert," London, 1884, p. 168, 



pi. xvi. ng. B. 



Sjjccific formula — a. 3. 2br.-^. 



Centro-dorsal a wide flat plate, bearing some fifteen to twenty-five marginal cirri of 

 fifteen to twenty-two tolerably uniform joints, with traces of double dorsal spines. 

 Second radials closely united laterally and only partially visible. Three distichals, the 

 third axillary with a syzygy. 



Twelve to twenty arms, the fifth and following joints almost triangular, much wider 

 than long, gradually becoming blunter and more cmadrate. The first syzygy is usually 

 in the second brachial, but is in the third if the arm springs directly from the radial 

 axillary. The next may be between the fifth and fourteenth brachials ; and others 

 follow at intervals of three to nine, usually four or five joints. 



The second distichal bears a pinnule about 1 5 mm. long ; that on the first brachial 

 is slightly shorter, and its successors diminish gradually to about the third pair. The 

 terminal comb may stop at the eighth brachial or go on to the fifteenth. 



Mouth radial ; all the arms tentaculiferous. A few calcareous granules on the disk. 



Colour in spirit, — reddish- or blackish-brown. 



Disk 16 mm.; spread 15 cm. 



Localities. — Banda, 17 fathoms. One specimen. 



Samboangan, 10 fathoms. One specimen. 



Other Localities. — H.M.S. " Alert," Flinders, Clairmont ; Singapore; Amboina ; the 

 China Sea. 



Remarks. — The essential difference between this species and Actinometra Jimbriata 

 lies in the more triangular shape of its arm-joints, which become quadrate and eventually 

 cuboid, but are never so nearly oblong as is the case in Actinometra jimbriata (PI. LX. 

 figs. 1,2; PI. LXII. fig. 3). The two Challenger specimens from Banda and Samboangan 



