56 ZOOTOMY. 



brown, lobulated bodies, lying close to the dorsal wall of 

 the abdominal cavity, and covered, on their ventral surfaces 

 only, by peritoneum. 



In the male. 



114. The epididymes (Fig. 18, epd\ long flat, whitish 

 bodies overlapping the anterior part of the kidneys, and con- 

 tinued forwards to the front boundary of the abdominal cavity. 

 The greater part of the epididymis (mesonephros or paror- 

 chis) has a granular appearance, and its actual tubular 

 structure is only seen in microscopical examination, but on 

 its ventral surface it is very evidently made up of a greatly 

 convoluted tube, which becomes more distinct and less con- 

 voluted near the posterior boundary of the parorchis, where 

 it passes into 



115. The vas deferens (Fig. 18, v.d), mesonephric 

 duct, or duct of the testis, a convoluted tube passing back- 

 wards from the hinder end of the epididymis, towards the 

 posterior boundary of the abdominal cavity, where it 

 becomes dilated. 



116. The sperm sacs (Fig. 18, s.s\ large whitish ovoidal bodies, 

 in the posterior region of the abdominal cavity, and immediately 

 external to the posterior dilated portion of the vasa deferentia, from 

 which they are separated externally by so slight a groove as not to be 

 readily distinguishable from them. They are seen to advantage only in 

 fully adult specimens. 



117. The coalesced remnants of the Miillerian or pronephric 

 ducts (Fig. 18, pn.d}, consisting of a fine thin-walled tube, situated 

 on the ventral wall of the hepatic sinus, where it dies away at 

 each side, and opens in the middle line by a small aperture homo- 

 logous with the peritoneal opening of the oviducts in the female 

 (see 118). 



In the female. 



118. The oviducts (Fig. 19, /./, ut\ each of which 

 consists of two parts : a posterior, wide, thick-walled uterine 



