180 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



mens have 27 and 29 arms which are about 100 mm. long and are composed of narrow 

 brachials; the cirri are XXI and XIX, from 20 to 22 mm. in length; these are typical 

 offimbriata as described by Carpenter. 



Of the 2 specimens from Investigator station 152, 1 has 18 arms about 90 mm. 

 long gradually increasing in diameter to about the twelfth brachial, and from that 

 point gradually tapering distally; the brachials are very short. 



The specimen recorded by Chadwick from Ceylon Pearl Oyster Fisheries station 

 IX has 12 arms. 



Of the 2 specimens examined from Tuticorin, 1 has 21 and the other 25 arms. 



The specimen recorded by Chadwick from Ceylon Pearl Oyster Fisheries station 

 LXVI has 22 arms ; the width of the arms increases gradually from the first to about 

 the twentieth brachial. 



The 5 specimens recorded from ?India (probably Ceylon) are all small or medium 

 sized. 



Of the 2 specimens from the Arrakan coast, 1 has 19 and the other 26 arms. 



One of the specimens from Investigator station 387 has 15 arms; of the 5 IIBr 

 series present, 1 is 2 instead of the usual 4 (3 + 4). One of the other specimens has 

 38 arms 80 mm. long, and the third has 42 arms 90 mm. long. Both of these last 

 approach in their general facies C. sentosa. 



The example from 8 miles west of Interview Island, Andamans, has 11 arms 85 

 mm. long. 



The specimen from off Rutland Island, Andamans, has 12 arms 85 mm. long 

 which are composed of short discoidal brachials on which the eversion of the distal 

 ends is more marked than usual. The eversion of the distal ends of the cirrus seg- 

 ments is exceedingly strong and continues all around excepting in the middle of the 

 ventral side, not being confined to the middle of the dorsal side as usual. The 

 central spines on the dorsal side of the cirrus segments are correspondingly enlarged. 



Of the 4 specimens from Investigator station 239, 2 have 11,1 has 12, and 1 has 

 13 arms. 



Of the 9 specimens collected by the Investigator at the Andaman Islands 4 are 

 small; of the others one has 13 arms, one 15, one 17, one 19, and one 21. The arms 

 of the 15-armed specimen are 100 mm. long and are composed of short discoidal 

 brachials which are strongly overlapping. The 13-armed specimen is of full size with 

 the short discoidal brachials of the fully adult. 



Of the 2 specimens from off Great West Torres Island, both of which are small, 

 1 has 13 arms and is undergoing adolescent autotomy. 



Of the specimen from Sumatra, Carpenter says that the radials are almost com- 

 pletely concealed ; there are 23 cirrus segments ; the second syzygy may be as early as 

 between brachials 12 + 13, while the distal intersyzygial interval may rise to over 20 

 muscular articulations. 



The 6 specimens from the southern portion of the Straits of Malacca have from 

 17 to 21 arms. One of them is typical of the species. It has 20 arms 75 mm. long. 

 All 10 of the IIBr series are present, and all are 4 (3 + 4). The arms and division series 

 are typically stout and the brachials are typically short. The distal edges of the 

 brachials are more strongly everted than usual and are finely spinous, and the distal 

 edges of the elements of the division series are similarly everted and spinous. 



