3 io 



out the bilobed cephalic gland (Fig. 101), and further 

 back the bulbous ends of the cheliceres with radiating 

 muscular fibres. Around these is a chitinous ring 

 formed by the fold at the base of the rostrum. 



The Ovary. Lying upon the diverticula in the 

 posterior portion of the body, the ovary studded with 

 developing ova (Fig. 103). 



Fig. 103. Reproductive organs of Ornithodoros 



Female : O ovary ; Ov = oviduct ; Sp = spermatheca ; 



G.O = genital orifice. Male : T = testis ; V .D = 



vas defer ens ; W = white gland ; P = penis ; 



G.O = genital orifice 



Note that there is a single ovarian sac opening at 

 either end into an oviduct, and that the developing 

 ova project from the outer wall of the sac and only 

 pass into the cavity at maturation (Fig. 104). 



By aid of sections and fresh preparations observe 

 that 



(a) Each ovum is attached to the ovary by a 

 funicle, composed- of a single tube of modified ovarian 

 cells. When the cavity of the ovary is distended this 

 tube is obliterated and the cells form a thick plate. 



