540 GEOLOGICAL SURVEY OF THE TERRITORIES. 



EXPLANATION OF PLATE XIII. 



Chirocephalus holmani Ryder, details. 



Fig. 1. Foot of tlie first jiair, with the following one, from a female; the Ist siightlj 



overlapping the 2d foot, X ^ A. 

 Fig. 2. Tenth foot of a female ; the sixth endite is turned down and the fifth tnmed 



up, X Y A., the third and fourth endites not seen. 

 Fig. 3. Third foot, showing the third and fourth endites, between the Ist and 2d, and 



the 5th, only the latter designated hy the sign P. 

 Fig. 3 a. Sixth endite from the third foot. 

 Fig. 4. Frontal process of an old, large male. 

 Fig. 5. Frontal process of younger, smaller male. 

 Drawn liy the author, with the aid of the camera lucida. 



