REPRODUCTIVE SYSTEM. 79 



septum forming the anterior wall of the segment, 

 and hanging freely from it into the ccelom below 

 the oesophagus. 

 To see the ovaries and oviducts stretch the body-wall trans- 

 versely and longitudinally, press the oesophagus to one side, 

 and look for them with a hand lens. 



b. The oviducts are a pair of short tubes, the wide 



mouths of which are placed in the hinder part of 

 segment xiii., one opposite each ovary. 



From the points where they perforate the 

 septum, the oviducts run outwards and slightly 

 backwards to their external openings on the 

 ventral surface of segment xiv. 



c. The receptacula ovorum are a pair of reniform sacs, 



attached to the anterior wall of segment xiv. just 

 above the oviducts, into the upper part of the 

 funnel-like mouths of which they open. 



d. The spermothecae or receptacula seminis are two 



pairs of globular sacs lying in the hinder parts 



of segments ix. and x. respectively. Their ducts, 



which are short, run backwards and open to the 



exterior in the grooves between the ninth and 



tenth, and the tenth and eleventh segments, 



respectively, just within the line of the outer 



double row of setae. 



1 In these the seminal fluid received from 



another worm is stored. The spermatozoa are 



[ aggregated into spermatophores ' by the glan- 



r dular apertures of the spermothecae and in this 



[state are fixed to the body of another worm. 



In Allolobophora, and exceptionally in Lum- 

 bricus, the spermothecse are situated in segments 

 x. and xi., their ducts passing forwards to open 

 in the same position as above. 



2. The male organs consist of two pairs of testes ; two 

 pairs of seminal funnels, leading into a pair of vasa 



