58 ZOOTOMY. 



ventral surface of the gullet, where the two tubes have a 

 common oval opening (fl.f) into the peritoneal cavity. 

 At the anterior end of the uterine portion of the oviduct is 

 a large, solid, reniform body, of a whitish hue, imbedded in 

 its walls : this is the oviducal gland (od.g), and secretes 

 the horny "purse" in which the eggs are laid: it is not 

 developed in very young specimens. 



119. The urinary bladder (Fig. 19, u.b) a bilobed 

 sac with thin membranous walls, situated between the 

 posterior ends of the oviducts : it will be better seen after 

 distension with air (see 123). 



XXV. Open the cloaca by a median incision along its 

 ventral wall, and note in it 



1 20. The opening of the rectum. 

 In the male. 



121.^ A small, thin-walled tube, the urinogenital papilla 

 (Fig. 1 8, ug.p], projecting from the dorsal wall of the 

 cloaca. By inserting a blowpipe into this and inflating, 

 the sperm sacs and vasa deferentia will be dilated. 



In the female. 



122. The large, thick-lipped apertures of the oviducts 

 (Fig. 19, ut\ one on each side of the anterior region of 

 the cloaca. In young specimens each of these is closed by 

 a fold of the mucous membrane, the hymen. 



123. A small conical elevation, the urinary papilla 

 (Fig. 19, u.p\ situated between the oviducal apertures and 

 having at its apex a small opening ; by inserting a blowpipe 

 into this and inflating, the urinary bladder will be 

 distended. 



In the male. 1 



XXVI. Slit up the urinogenital papilla, cutting along a probe or 



1 The following points ( 124 127) can only be made out to advantage 

 in fully adult specimens. 



