3" 



(b) A portion of the ovary consists of a delicate, 

 much, wrinkled membrane, which does not bear ova. 



Spermatbeca. Upon either side of the ovary the 

 coiled oviducts ending in the middle line in the large 

 bilobed spermatheca (Fig. 103). Open the sperma- 

 theca, and note the presence of cyst-like bodies 

 (spermatophores) containing masses of spermatozoa. 



Rectum. Behind the spermatheca, observe the 

 filamentous termination of the alimentary canal in the 

 dilated rectum (Fig. 101). 



Note the thin walls, the entry of the two mal- 

 pighian tubes into it, and its opening at the anus. 

 Note the oval or the dumb-bell shaped crystals of the 

 contained secretion. 



OVCL 



^^. 104. (l) Portion of ovary of Ornithodoros ; 

 (2) Ovum and follicle 



Malpighian Tubules. Note the great length of 

 these and their tortuous course among the viscera 

 (Fig. 101). Trace them from their origin in the rectum 

 to their blind termination in the anterior portion of 

 the body. Note, in some cases, small dilatations 

 containing secretion similar to that in the rectum, 



