CALAMOCKINUS DIOJIED.E. 19 



arm and its branches become compressed laterally as the distance from 

 the disk increases (compare Plate 111. Figs. 1, 2, and Plate I. Figs. 5-7), 

 and towards the distal end they become quite flattened (Plate 1. Fig. 1). 



In still another imperfect arm, the third axillary was the eleventh joint 

 beyond the second, and with a syzygy on the fifth arm joint. 



The fork to the right had syzygies on the second, third, sixth, 

 twenty-second, and twenty-eighth arm joints, and no others to the end 

 of the fork. 



The main arm between the third and fourth axillaries had syzygies on 

 the first, third, and ninth joints. 



The fourth axillaiy was the. tenth joint beyond the third, and the fifth 

 the thirteenth bej'ond the preceding axillary. Between the fourth and 

 fifth axillaries, the main arm had syzygies on the fifth and eighth arm 

 joints. The fork^ to the right of the fourth axillary had syz3'gies on the 

 second, fourth, seventh, twelfth, and nineteenth arm joints. The main arm 

 from the fifth axillary to the end of the arm had syzygies on the eleventh, 

 seventeenth, twenty-eighth, thirty-second, thirty-fifth, thirty-eighth, forty- 

 first, forty-third, forty-sixth, fiftieth, fifty-third, fifty-seventh, and sixtieth 

 arm joints. 



In a broken arm the first axillary was the seventh brachial. The first 

 fork to the right had syzygies on the second and third joints, and there 

 were twenty-one joints without any, the extremity of the arm being broken 

 at that point. 



The second axillary was the seventh arm joint beyond the first, the third 

 the eleventh, and the fourth the twelfth beyond the preceding ones. Be- 

 tween the first and second axillaries, and between the second and third, 

 the third arm joint had a syzygy. Between the third and fourth axillaries, 

 the fourth and eighth joints had syzygies. 



In another fragmentary arm the second axillary was the seventh joint, 

 the third the ninth, and the fourth the twelfth joint beyond the preceding 

 axillary. Betwen the second and third axillaries, the third and fifth arm 

 joints had .syz3gies ; between the third and fourth axillaries, the fourth and 

 seventh arm joints. 



The second fork had syzygial joints on the second, fourth, and nineteenth 

 arm joints ; the third, on the second, third, sixth, fourteenth, twentieth, and 

 twenty-sixth joints ; the fourth, on the second and third joints. All these 

 forks branched off to the left of the main arm. 



