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incision in the second sternite. At the back it reaches right 

 up to the third segment, whereby the second segment which 

 is quite small becomes wedge-shaped. The third segment has 

 a furrow which runs parallel with its posterior margin, and at 

 a short distance from the latter. — The upper part of the arm 

 is short, but very strong, and has the shape of a three-sided 

 pyramid with the point turned downwards; in height it reaches 

 the surface of the anterio-lateral margin. The plane which 

 turns inwards towards the flanks is slightly arched, while the 

 two other sides are arched more strongly, the one which turns 

 upwards more so than the one turning downwards. Farthest to 

 the front on the lowest margin a strong round spine is seen, 

 the base of which is bordered by a deep furrow. On the front 

 border of the innerside are two spines, one above the other. — 

 The forearm is short, strong and square. On its two upper 

 front corners two spines are seen whereof the innermost one 

 is long and pointed, while the outer one is rounded, and fits 

 into a cavity in the hand. The upper side is strongly arched, 

 the two back corners rounded. Further details of the structure 

 of the forearm cannot be made out. 



The hand is short, strongly built; its shape is longish- 

 triangular. Its outer side is fairly strongly arched, the inner 

 side is arched in the middle, but excavated near the under and 

 upper margin. At the end of the hand there is, on the upper 

 side, a small tubercle with a cavity with which a small projec- 

 tion on the forearm corresponds, and hereby a sort of joint is 

 formed. The hand is separated from the immoveable finger by 

 a cavity. 



The fingers are narrow. On their innerside they have a 

 row of large and small oblong teeth, which decrease in size 

 towards the front. Inside the teeth a row of small irregular 

 cavities is seen. In a number of specimens, which all seem 

 to be males, the fingers (especially the immoveable finger) have 

 a distinct furrow on both sides, while in the females there is 



