574 GEOLOGICAL SURVEY OF THE: TERRITORIES. 
EXPLANATION OF PLATE XXX. 
Fic. 1. Branchipus vernalis Verrill. Sixth endite of an anterior leg, showing the mus- 
cles and tactile nerves, which arise independently of the central nervous 
system near the margin of the lobe; nc!, inner series; nc*, marginal series of 
ganglion cells; on the left side the origin of the setal nerves are seen. 
Fic. 2. Streptocephalus tecanus Pack. The 6th endite of an anterior foot. 
Fig. 3. Streptocephalus tecanus Pack. <A portion of fig. 2x 4A, showing the mode of 
termination of the muscle in the middle of the lobe; the origin of the setal 
nerves from the inner series of ganglion cells (no); 8, seta. 
