620 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The number of muscular articulations in the first intersyzygial interval in 38 

 arms of this specimen is given by Carpenter as follows: 1 (twice); 4 (twice); 5 (twice); 

 6 (seven times); 7 (twenty-two times); 8 (three times). 



The number of muscular articulations in the second intersyzygial interval in 38 

 arms of this individual is given by Carpenter as follows: 3 (four times); 4 (thirty 

 times); 5 (twice); 6 (once); 7 (once). 



In the distal intersyzygial interval there is a tendency to a decrease rather than to 

 an increase in the number of muscular articulations, which is more often 3 than 5. 



Carpenter's variety 4 from Ubay was thus characterized. 



The centrodorsal is large and thick, with only 3 cirrus scars. 



The IBri are closely united all around the calyx. 



The arms are 33 in number, all tentaculiferous, and tolerably uniform in length 

 and in the character of their pinnules. 



The intersyzygial interval varies from 1 to 7 muscular articulations, being 

 usually 4. 



The oral pinnules are much stouter than in the type (by which apparently is 

 meant variety 1 from Ubay, herein described under parvicirra) . That of the third 

 brachial is but little shorter than that of the second. The comb is limited to these, 

 and to the pinnules of the division series, and the processes forming it gradually 

 come to rise from the ventral surfaces of the calcareous segments instead of from 

 their outer margins. 



The color is blackish brown with a very marked median white line on the dorsal 

 surface of the skeleton. 



Carpenter said further that of the 10 IIBr series present 9 are 4 (3+4) and 1 

 is 2. There are 13 IIIBr series of which 12 are 4 (3+4) and 1 is 2. The single 

 IIIBr series following a IIBr 2 series is 4 (3 + 4). Of the IIIBr series following IIBr 

 4 (3 + 4) series, 11 are 4 (3 + 4) and 1 is 2. 



All of the arms are grooved. 



This specimen shows considerable variation in the position of the brachial 

 syzygies. On no less than 10 arms the first syzygy is not between brachials 3+4. 

 On these arms the position of the first 3 syzygies is as follows: Between brachials 

 4 + 5, 10 + 11, 15 + 16 (once); between brachials 4 + 5, 11 + 12, 16 + 17 (twice); be- 

 tween brachials 6 + 7, 11 + 12, 16+17 (once); between brachials 9 + 10, 14 + 15, 

 19 + 20 (twice); between brachials 10 + 11, 15 + 16, 18 + 19 (once); between brachials 

 10+11, 15 + 16, 20 + 21 (twice); between brachials 10+11, 15 + 16, 21 + 22 (once). 



On the arms in which the first syzygy is between brachials 3 + 4 the syzygies 

 are also distributed irregularly in the following cases: Between brachials 3+4, 

 9 + 10, 14 + 15 (twice); between brachials 3+4, 10 + 11, 15+16 (three times); 

 between brachials 3+4, 11 + 12, 16+17 (thirteen times); between brachials 3 + 4, 

 11 + 12, 18 + 19 (once); between brachials 3 + 4, 12 + 13, 16 + 17 (once); between 

 brachials 3 + 4, 12 + 13, 17 + 18 (twice); between brachials 3 + 4, 14 + 15, 19 + 20 

 (once). 



The number of muscular articulations in the first intersyzygial interval in 23 

 arms of this specimen is given by Carpenter as follows: 5 (twice), 6 (three times), 7 

 (fourteen times), 8 (three times), and 10 (once). 



