1006 MR. R. J. ORTLEPP ON THE 



short and oblique rectum, lined internally with chitin a,nd 

 accompanied on its outer surface by a number of rectal glands. 



The tail of the female is generally short and conical ; it is 

 supplied with a unicellular gland ; two lateral caudal pores are 

 present, situated generally behind its middle. 



The male caudal extremity is incurved ventralwards, and 

 carries on either side a cuticular expansion, ^vhich passes across 

 the ventral surface, some short distance in front of the anus, 

 to join its fellow of the other side. It is always supported by at 

 least four pairs of long pedunculated papillae, generally arranged 

 circumcloacally. Its ventral surface is nearly always ornamented 

 either by longitudinal ridges, or with longitudinal rows of 

 tubercles, or spikes or rounded prominences. In addition, there is 

 present a variable number of ventral papillse (? absent in PA. guiarti 

 Garin) which ai'e generally sessile ; typically these consist of three 

 pre-anal and five pairs of post-anal papillse, but this number may 

 vary in some species. 



In the female the vulva is always situated in the anterior half 

 of the body. It is a circular aperture, generally situated on a 

 slight elevation. It leads into an unpaired ovijectoral portion, 

 which in its turn is followed by a double or multiple portion of 

 the female genitalia. The ovijectoral part consists typically 

 of three subdivisions, viz. : (1) a thick-walled cylindrical and 

 muscular vaginal part, lined internally with chitin ; (2) a 

 middle swollen portion, generally having its lumen filled with 

 eggs : this part I have interpreted as " egg-chamber " ; and (.3) a 

 posterior cylindrical portion of about the sa,me thickness as the 

 vagina, but generally shorter : this part I have designated in the 

 desoiptions by the term " common trunk ", as it probably 

 represents a fused portion of the uteri. The first two parts are 

 always present, but the last is often absent. The double or 

 multiple parts consist of two or more tabules connected by a 

 thinner part to the common trunk or egg-chamber, and com- 

 prising a uterus, a receptaculum seminis, an oviduct, and an 

 ovary. The uteri are large, and are filled with numerous eggs ; 

 they fill practically the whole body-cavity, and pass backwards 

 more or less parallel to each other to within a few" millimetres 

 from the posterior extrem.ity ; they then pass forw^ards, become 

 thinner, a,nd join on to the receptaeula seminis. The receptacula 

 seminis are small, oval, rounded, or pyriform, with their greatest 

 diameter further av/ay from the uteri. The oviducts are fine 

 ducts, connecting the oviducts to the receptacula seminis ; their 

 transition into the ovaries is generally gradual, but into the 

 receptacula it is abrupt. The ovaries are long and taper gradually 

 to their ti^) : they at first pass irregulary for\va,rds', but recurve to 

 end generally in the anterior body half. 



The eggs are relatively small, oval, smooth, and very thick- 

 shelled, and are embryonated before being laid. 



The male genital tubule is unpaired, and is situated ventrad 

 to the digestive tract. It consists of three well-defined portions, 



