102 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



the dorsal pole flat, 3 mm. in diameter; the cirrus sockets are arranged in a single 

 slightly irregular marginal row. The cirri which still remain are VII, 15-16, from 

 13 to 15 mm. long; the sixth is a transition segment. 



In the specimen from the Danish Expedition to the Kei Islands station 24 the 

 centrodorsal is thin discoidal, with a broad flat dorsal pole 4 mm. m diameter. The 

 cirrus sockets are arranged in a partially double crowded and somewhat irregular 

 marginal row. 



The cirri are XXV, 20-21, 20 mm. long, with the distal half rather strongly 

 recurved. The first segment is vei-y short, the second is from half again to twice as 

 broad as long, the third is about as long as broad, the fourth is longer, and the fifth 

 is the longest, nearly twice as long as broad, and is a more or less marked transition 

 segment. The following segments decrease m length so that the last 12 are broader 

 than long. The transition and following segments have the dorsal portion of the 

 distal edge slightly produced and armed with very fine spines. Distally this pro- 

 duction gradually narrows and increases in height and at the same time the distal 

 border transforms from a straight line to a deeper and deeper V. On the short outer 

 segments the dorsal surface may be sharply carinate in the middorsal line. In lateral 

 view the dorsal profile of the cirri following the transition segment is at first gently 

 serrate, the apices of the serrations being near the distal ends of the segments, but on 

 the last 5 or 6 segments it becomes scalloped rather than serrate. The opposing 

 spine is low, conical, arising from the entire dorsal surface of the segment, with the 

 apex median or subtermiaal. The terminal claw is slightly longer than the penulti- 

 mate segment and is stout and only moderately curved. 



The 12 arms are 140 mm. long. The two IIBr series, both on the same post- 

 radial series, are 2. Following both the inner derivative has the first 4 brachials 

 united in 2 syzygial pairs, while on the outer derivative the first and second brachials 

 are united by synarthry, the third and fourth by syzygy. 



The example from Wooded Isle, Abrolhos Islands, has 25 arms which are about 

 90 mm. long. The cirri are XXX, 19-22. The disk is 25 mm. in diameter. 



The specimen from the Sahul Bank is very small, and is remarkable for its unusu- 

 ally large cirri. The arms on the 5 rays are 7, 7, 6, 6, 4 = 30. 



Of the specimens from Mer which I have personally examined, one has 36 arms 

 and the cirri XXIII, 23; another has 39 arms and the cirri XXIV, 24; and the remain- 

 der have 35, 39, and 43 arms, those of the last being about 100 mm. long. 



The specimen from New Guinea in the Berlin Museum is small, with 30 arms; 

 the cirri are XIV, 19-21. 



The example labeled "Samoa and Fiji," in the British Museum, has 33 arms; 

 all the division series are external in reference to the IBr series. The 2 with the 

 same label in the Hamburg Museum each have 30 arms. 



In the specimen from Ovalau, Fiji, Pi is about 25 mm. long. 

 Of 2 examples from the Tonga Islands, in the Copenhagen Museum, one has 30 

 arms 90 mm. long, and the cu-ri XXX, 20-26 (usuaUy 23-25), from 15 to 25 mm. 

 in length; the transition segment is about the thirteenth. The other (dry) has 

 31 arms, all of which are broken off near the base; the cirri are XXXVII, 18-21 

 (usually 20). 



