656 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



There are 26 arms; all 10 of the IIBr series and all 6 of the IIIBr series are 4 

 (3 + 4). 



There are 28 arms; of the 10 IIBr series, 7 are 4 (3 + 4) and 3 are 2; the 5 IIIBr 

 series are all 4 (3 + 4). [This gives 25 arms instead of 28, the number ascribed to it 

 by Carpenter.] On 4 of the arms the earlier syzygies occur between brachials 10+11, 

 15+16, and 20 + 21. 



There are 28 arms; all 10 of the IIBr series are 4 (3 + 4); of the 8 IIIBr series, 7 

 are 4 (3 + 4) and 1 is 2. 



There are 31 arms; the 10 IIBr series and the 11 IIIBr series are all 4 (3 + 4). 



Additional details in regard to the structure of the individual arms have already 

 been given. 10 



Carpenter pointed out that when the number of arms is unequal on the various 

 postradial series arm division is generally carried further in the left anterior, left 

 posterior, and right posterior radii than in the anterior and right anterior. In only 

 four normal cases did he find one of the latter bearing more arms than one of the former. 

 In each of these the total number of arms was considerable, and 1 at least of the 2 

 radii left posterior and right posterior bore the same number of arms as that in the 

 anterior or right anterior. 



In the 299 arms of these specimens (11 were broken off proximal to the fourth 

 brachial) the first syzygy was between brachials 3 + 4 in 283, and the second syzygy 

 was between brachials 11 + 12 in 156. The irregularities in the position of the first 

 syzygy were limited to 3 specimens, and 10 of the 16 occurred in the specimen 

 described as variety 4 (timorensis) . 



In the 283 arms in which the first syzygy was between brachials 3 + 4, exclud- 

 ing the 61 arms from varieties 3 and 4 (timorensis) , Carpenter found the following 

 variations in the position of the second and third syzygies: 



Syzygies between brachials 3 + 4, 5 + 6, 7 + 8; in variety 2, 1 arm. 



Syzygies between brachials 3+4, 6 + 7, 12 + 13 ; in the typical series, 2 arms. 



Syzygies between brachials 3 + 4, 7 + 8, 13 + 14; in the typical series, 1 arm 



Syzygies between brachials 3 + 4, 9 + 10, 13 + 14; in the typical series, 1 

 Syzygies between brachials 3 + 4, 9+10, 14 + 15; in the typical series, 1 



arm. 

 arm. 

 arm. 



Syzygies between brachials 3 + 4, 9 + 10, 15 + 16; in the typical series, 



Syzygies between brachials 3 + 4, 9 + 10, 16 + 17; in the typical series, 1 arm. 



Syzygies between brachials 3 + 4, 10+11, 13 + 14; in the tvpic.al series, 1 arm. 



Syzygies between brachials 3 + 4, 10 + 11, 14+15; in the typical series, 1 arm. 



Syzygies between brachials 3 + 4, 10+11, 15 + 16; in the typical series, 10 arms. 



Syzygies between brachials 3 + 4, 10+ 11, 16 + 17; in the typical series, 1 arm. 



Syzygies between brachials 3 + 4, 11 + 12, 14 + 15 ; in the typical series, 1 arm. 



Syzygies between brachials 3 + 4, 11 + 12, 15 + 16; in the typical series, 3 arms; 

 in variety 1, 1 arm. 



Syzygies between brachials 3 + 4, 11 + 12, 16 + 17; in the typical series, 76 arms; 

 in variety 1, 10 arms; in variety 2, 23 arms. 



Syzygies between brachials 3 + 4, 11 + 12, 18+ 19; in the typical series, 1 arm; in 

 variety 1, 1 arm. 



' Vol.1, pt.2, p. 93. 



