305 



(i) Ornithodoros. Note the deep sulci (Fig. 100), 

 especially 



1. The supra-coxal groove, which gives rise to 

 the supra-coxal fold and extends quite around the 

 anterior portion of the body. 



2. The pre-anal sulcus, lying just in front of the 

 anus and very conspicuous in sections. 



An 05 



Fig. 100. Ornitbodoros : (i) side view, (2) dorsal view, 

 (3) ventral view 



3. The sulci about the head. The conical head 

 can be retracted to a considerable extent into the fold 

 of the integument (camerostome). 



At the base of this fold is a groove, and in it the 

 opening of the cephalic gland. This opening can be 

 seen by forcibly flexing the head on to the belly. 



On the coxae of the first pair of legs, lying within 

 the groove which separates this from the coxa of the 



YV 



