270 



THE ANIMAL PARASITES OF MAN 



passes into the uterus, so does the testis pass into the sper- 

 matic duct ; the latter is often divided into the somewhat dilated 



seminal vesicle and into the mus- 

 cular ductus ejaculatorius, which, 

 running ventrally from the intes- 

 tine backwards (fig. 189), finally 

 opens into the hind gut. The sper- 

 matozoa of the Nematodes, it may 

 be noted, only attain their full 

 development after the sperm- 

 mother cells have been conveyed 

 by copulation into the uteri of the 

 female genitalia. The spermatic 



corpuscles of the Nematodes present an unusual form. (They have 

 no flagella but are capable of amoeboid movement.) 



FIG. 187. Transverse section 

 through the ovarian tube of A scar is 

 mystax (of the cat) at various levels. 

 To demonstrate the development of 

 the ova and of the rhachis. (Mag- 

 nified.) 



FIG. 1 88. Male of 

 the rhabditis form of 

 Rhdbdonema, nigrovcno- 

 sum (magnified). A., 

 anus ; /., small in- 

 testine ; T., testicu- 

 lar tube ; O., oral 

 orifice ; P., papilla ; 

 Sp., spicula. 



FIG. 189. Transverse section through 

 the posterior extremity of the body of 

 A scans lumbricoid.es (Male). The intestine 

 is in the middle, and the lateral ridges 

 are subjoined thereto ; above the intes- 

 tine the two spicula sacs are seen ; below 

 is the ductus ejaculatoris. The muscular 

 fibres are between the lateral and dorsal 

 median ridges. (Magnified.) 



The male genital apparatus is also provided with one or two 

 glandular sacs, situated on the dorsal side of the intestine, and 



