3 I2 



Male Reproductive Organs. Observe a similar 

 arrangement to the female organs, the testis being, 

 however, a smaller and finer tube than the ovary and 

 ending on either side in coiled vasa deferentia, which 

 finally enter the large ' white gland.' The ejaculatory 

 duct ends in a chitinous penis (Fig. 103). 



The Mouth Parts. Behind the place of the origin 

 of the palps a small portion of the mouth is completely 

 closed in. Here the pharynx opens ventrally by a 

 slit-like opening protected by a narrow tongue of 

 chitin ; and into the two posterior angles open the 

 large salivary ducts of either side (Fig. 105). 



Fig. 105. Mouth-parts of Ornithodoros 

 (i) Longitudinal section; (2) Transverse section 



The Pharynx and Endosclerite. Macerate a 

 specimen of Ornithodoros after removing the dorsal 

 chitin by boiling in caustic potash (ten per cent.). 

 Make out the following (Fig. 105) : 



(i) A broad sheet of chitin which lies horizontally 

 and divides the cavity of the rostrum into an upper 

 and a lower portion. This projects behind well into 

 the body cavity, and is connected anteriorly with the 

 dense chitin about the base of the palps and back 

 portion of the buccal cavity. 



