184 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



internally developed, are all 3 (2 + 3). The example from about 46 meters has 14 

 arms, a IIBr 4 (3 + 4) series being developed on each of 4 postradial series. Of the 



3 specimens from 33-55 meters 1 has 21 arms about 80 mm. long; there are 10 IIBr 



4 (3 + 4) series, and a single IIIBr 3 (2 + 3) series which is externally developed. 

 Another specimen has 17 arms 95 mm. long; there are 7 IIBr 4 (3+4) series. The 

 cirri are XV, 22-24, from 15 to 20 mm. long. The opposing spine is laterally broad- 

 ened with a chisel-shaped edge notched in the middle, forked, or is represented by 2 

 conical spines situated side by side and more or less widely separated basally. The 

 third specimen is small with 12 arms 60 mm. long; one arm pair is just arising through 

 adolescent autotomy. Both of the IIBr series are 4 (3+4). 



The example from Siboga station 93 has 11 arms 50 mm. long; the single IIBr 

 series is just forming through adolescent autotomy. 



The details of the 10 specimens from Siboga station 99 are as follows: (1) twenty- 

 six arms 95 mm. long; all of the IIBr series are present, and all are 4 (3 + 4); the 6 

 IIIBr series, all of which are internally developed, are all 3 (2 + 3). (2) Twenty arms 

 90 mm. long; all of the IIBr series are present, one 2, nine 4 (3 + 4). (3) Twenty 

 arms 70 mm. long; all the IIBr series are present, and all are 4 (3 + 4). (4) Twenty 

 arms 70 mm. long; all of the IIBr series are present. (5) Twenty arms 80 mm. 

 long; all the IIBr series are present. (6) Twelve arms 60 mm. long; the 2 additional 

 arms are just appearing through adolescent autotomy. (7) Fourteen arms. (8) 

 Fourteen arms. (9) Twelve arms. (10) Ten arms. 



According to Carpenter the specimen from Challenger station 212 has 20 arms 

 which are relatively large, though the cirri are small ; the terminal combs on the lower 

 pinnules are rarely found beyond the eighth brachial. 



One of the specimens from Albatross station 5249 has 20 arms which are com- 

 posed of oblong and strongly overlapping brachials; all of the IIBr series are present. 

 The other specimen is small. 



The specimen from Bantayan reef, Cebu, has 19 arms. 



The example from Albatross station 5482 has about 30 arms. 



Carpenter noted that in the specimen from Challenger station 208 there is a small 

 spine on the distal dorsal edge of the fifth cirrus segment; on the following segments 

 it gradually develops into a crest bearing a variable number of spinelets which some- 

 times give rise to a double opposing spine on the penultimate. 



Some of the specimens from Port Galera, Mindoro, present the following features : 

 (1) Twenty-four arms about 135 mm. long, composed of very short brachials the 

 ends of which are armed with very numerous closely set spines in several rows; the 

 cirri are XXV, 18-21; the dorsal pole of the centrodorsal is 4 mm. in diameter. (2) 

 Twenty arms about 120 mm. long; all of the IIBr series are present, 2 being 2 and the 

 remaining 8 being 4 (3 + 4); the arms broaden considerably to about the twelfth 

 brachial; the brachials are very short, discoidal, with very prominent ends which are 

 armed with several rows of very fine closely set spines. (3) Thirty-seven arms 120 

 mm. long; the brachials are short, and their distal ends bear numerous closely set 

 small spines; the centrodorsal is 4 mm. in diameter. (4) Twenty-two arms 135 mm. 

 long; there are 20-21 cirrus segments; the centrodorsal is 4 mm. in diameter. (5) 

 Twenty arms, all the IIBr series being present, all 4 (3+4); the arms are slender, the 



