196 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



large rounded openings leading into blind cavities which usually occur at the bases of 

 the large oral pinnules. In the largest of these cavities, which has two openings, 

 there is an ambulacral groove in the interior. The disk is further peculiar in possess- 

 ing two mouths, a supplementary mouth, not quite so large as the true mouth, 

 being situated just to the right of it. 



The example from Siboga station 37 has 19 arms; 3 of the 8 IIBr series are 2 and 

 5 are 4 (3 + 4); 1 of the IIBr 2 scries bears externally a IIIBr 2 series. 



In the specimen collected by Dr. J. Brock at Amboina 7 of the IIBr series are 

 2 and 3 are 4 (3 + 4). 



In 1 of the specimens from Siboga station 133, which has 19 arms 70 mm. long, 



2 of the IIBr series are 2, 1 of these bearing internally a IIIBr 2 series. In the 

 largest specimen from the same station, which has 15 arms 85 mm. long, 1 of the IIBr 

 series is 3 (2 + 3), the other 4 being 4 (3 + 4). 



In a specimen with 20 arms 90 mm. long from Siboga station 99, 1 of the IIBr 

 series is 2 the other 9 being 4 (3 + 4). 



One of the specimens from Port Galera, Mindoro, has 2 IIBr series 2 and eight 

 4(3 + 4). 



The individual from Siboga station 47 has 20 arms 125 mm. long; the cirri are 22 

 or 23 mm. long; the brachials are very short, discoidal, with their distal edges strongly 

 everted and abundantly supplied with short spines so that the animal feels very dry 

 or rough; 3 of the IIBr series are 2, and 1, paired with 1 of 2, is 1; the other 6 are 

 4 (3+4). 



A IIBr 2 series occurs in one of the 18 armed specimens from Siboga station 50. 



There is a IIBr 2 series in the small 15-armed specimen from Siboga station 296. 



One of the specimens collected by Dr. Th. Mortensen at the Kei Islands, station 

 14, has 2 of the IIIBr series 2 (1+2). The specimen from station 15 has 1 of the IIBr 

 series 1, 2 of them 2, and 7 of them 4 (3 + 4). One of the specimens from station 21 

 has 2 of the IIBr series 3, the other 8 being 4 (3 + 4). In a specimen from station 

 30 there are 2 IIIBr series developed internally on the same postradial series, 1 of 

 them 2 and the other 5 (2 + 3) ; in the latter the third element is shaped like an axillary, 

 but bears merely a single ossicle. In one of the specimens from station 31 one of 

 the IIBr series is represented by 2 ossicles, of which the outer bears a pair of pin- 

 nules. In one of the examples from station 85 there is a IIIBr 2 series following a 

 IIBr 2 series. A specimen from station 65 has 1 IIBr series 3, the other 9 being 

 4 (3 + 4) ; of the IIIBr series 2 are 1, 1 is 2, and 16 are 3 (2 + 3). 



The figure published by Carpenter of the Challenger specimen from Banda 

 (pi. 60, fig. 2) shows 1 IIBr 2 series, and 3 IIBr 4 (3 + 4) series. The larger of the 2 

 Siboga specimens from Banda {Siboga station 240) has 3 of the 10 IIBr series 2. 



A specimen collected by Dr. Th. Mortensen off Neira, Banda, in about 15 

 meters which has 19 arms has a IIIBr 2 series. Another, also with 19 arms, has a 

 IIBr 3 series. A specimen from the same locality in about 20 meters with 24 arms 

 has 1 of the IIBr series 3 (2 + 3) and 1 of the IIIBr series 2(1+2). 



A small 13-armed specimen from Siboga station 162 has one of the IIBr series 2. 



In 1 of the specmiens from between Fremantle and Geraldton, Western Austraha, 

 4 of the 8 IIBr series are 2 and 4 are 4 (3 + 4); of the 6 IIIBr series 1 is 2 and 5 are 



3 (2 + 3). In another 2 of the 10 IIBr series are 2 and 8 are 4 (3 + 4). 



