338 THE EARTHWORM chap. 



Certain globular sacs called spermothecx (Fig. 82) also 

 belong to the female part of the reproductive apparatus. 

 Of these there are usually two pairs (sometimes more than 

 two in Allolobophora) situated in the ninth and tenth 

 segments, and opening to the exterior between the ninth 

 and tenth, and tenth and eleventh segments respectively ; 

 their function will be mentioned presently. 



The earthworm possesses two pairs of very minute sperm- 

 aries attached to the posterior face of the septum between the 

 ninth and tenth, and tenth and eleventh segments respectively 

 (Figs. 79 te, and 82, t). They have a flattened form and 

 their free or distal ends are produced into finger-shaped 

 processes. Behind each spermary, and in the same seg- 

 ment, is a ciliated seminal funnel opening into the coelome 

 and produced backwards through the septum next behind 

 into an efferent duct, the two ducts of either side communi- 

 cating with a main spermiduct or vas deferens (Figs. 79 and 

 82). Each of these extends backwards in the ventral body- 

 wall to open by a tumid lip on the fifteenth segment, near 

 the inner couple of setae. 



The most prominent portions of the reproductive appar- 

 atus are certain large whitish bodies — the sperm-sacs or 

 seminal vesicles (Figs. 79, ves. sem, and 82, sp. s) which are very 

 apparent in the adult worm as soon as the coelome is cut open 

 in this region. Of these there are three (Lumbricus) or four 

 (Allolobophora) pairs, situated in segments 9 — 12. They arise 

 as outgrowths of the septa, and^communicate with the coelome; 

 but in Lumbricus, the anterior pair and the two posterior pairs 

 respectively become joined across the middle line so as to 

 form two median sperm-reservoirs (Figs. 79-, med. ves. sem, 

 and 82, s.s), each of which encloses a coelomic cavity in which 

 one pair of spermaries and seminal funnels becomes en- 

 closed. 



