7 6 



E. A. ANDREWS. 



truncated to articulate with the unusual pronged structure or 

 second claw-like ending of the limb. There is also an abnor- 

 mality in the propodite, indicated in Fig. 2, and suggesting 

 some former injury ; it is a slight indentation upon the middle of 

 the anterior face. 



The movements possible to the dactyl in the normal, alcoholic 

 specimen (Fig. 3) are a swinging of 4.11 mm. in one plane to 



FlG. 2. Anterior view of terminal part of Fig. I. Camera. Zeiss 2, a. 



bring about direct apposition of the tips of the forceps, with no 

 overlapping and also a very slight lateral movement. 



In the aberrant limb the dactyl is so set that apposition is im- 

 perfect ; the dactyl passes the tip of the index by about .5 mm. 

 while the entire swing is the same as above, 4. 1 1 mm. The 

 actual gape of the forceps is restricted to that same amount, .5 

 mm. All movement in this forceps is strictly in one plane. 



Next considering the monstrous, pronged structure we find 

 that, starting from the position shown in Fig. 2, there is a possible 



