94 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



twice as broad as long, and the following become wedge-shaped or even triangular, 

 about half again as broad as long, then gradually less oblique, about twice as broad 

 as long, which proportion is maintained until the very tip of the arm is reached, 

 the brachials then becoming about as long as broad. After the proximal oblong 

 brachials, which are smooth, the brachials develop very prominent and somewhat 

 overlapping distal ends which are armed with very fine spines, and a striate dorsal 

 surface. 



Syzygies occur between brachials 1+2 (on the outermost arms arising from a 

 IIIBr series brachials 3 + 4), and often again between brachials 3+4 or 4 + 5; the 

 next syzygy is somewhere between brachials 14 + 15 and 23 + 24 (the variation in any 

 one individual being usually not more than 3 or 4 brachials), and the distal inter- 

 syzygial interval is 4 muscular articulations. 



The pinnules are in general similar to those of C. stelligera. P t is 25 mm. long, 

 resembling PI in C. stelligera and with a similar comb. The genital pinnules are 

 about 10 mm. long, and the distal pinnules are 15 mm. long. 



The mouth is usually interradial and submarginal. The anal area is very large, 

 naked, or with large scattered calcareous concretions which are sometimes high and 

 conical. The disk is from 30 to 35 mm. in diameter. 



The color in alcohol varies from dull yellow to dark yellowish, greenish, or reddish 

 brown; sometimes the specimen, if fresh, is covered with small light green spots, 

 which are especially frequent on the disk. 



Notes. The single specimen recorded from the Aru Islands has 38 arms from 

 150 to 160 mm. in length; the cirri are XXII, 26, up to about 30 mm. long; the centro- 

 dorsal is large, with the dorsal pole flat and slightly depressed in the middle; P t on the 

 outer arms reaches a length of 25 mm. or more; P 2 is shorter; both these pinnules 

 have a prominent comb. The distal brachials are not very short, and their distal 

 ends are not produced. 



In the specimen collected by MM. Maurice Bedot and C. Pictet at the bay of 

 Amboina and recorded by Professor Koehler, most of the cirri had been broken off, 

 but from the number of the sockets they could not have been more than XVI or XVII. 

 The cirrus segments are especially elongated, and the outermost bear small dorsal 

 spines. 



The IBri are largely visible and are united laterally. On some rays there are 

 IVBr series. 



There are 44 + arms, most of which are broken. 



The first syzygy is between brachials 1+2, and on the external arms following 

 each of the outermost axillaries, but not on the internal, there is another syzygy 

 between brachials 3 + 4. The second syzygy is at about the sixteenth brachial. 



The first pinnule is the longest, the length of the pinnules following decreasing 

 regularly to the fourth or fifth. 



The disk is 30 mm. in diameter. The mouth is radial. 



Of the specimens collected by the Danish Expedition to the Kei Islands that from 

 station 14 has about 45 arms; the one from station 26 is typical, though rather small; 

 that from station 31 has about 55 arms; the cirri are large and stout, XVI, 27, 30 mm. 

 long; the example from station 40 has 50 arms 150 mm. long; the centrodorsal is 



