PHYLUM ANNULATA 



451 



te'), partly divided into a number of digitate lobes, situated in the 

 tenth and eleventh segments. A pair of comparatively large sacs, 

 the anterior vesiculce seminales (ant. ves. sem), lie partly in the 

 cavity of the ninth segment, but extend into the tenth, where 

 they coalesce in the middle to form a large median sac of some- 

 what irregular form, the anterior sperm-reservoir (ant. sp. res). 

 The anterior pair of testes project into this, and the cells destined 

 to form the sperms, developed in the former, pass by dehiscence 

 into the large median cavity. On either side is a large ciliated 

 funnel, or rosette (fun), leading outwards from the interior of the 



ctnt. ves sem 

 irr int 



ant. sp res 

 <t I ipt 



I 



rec 



rec 



ov.d, 



ov.d- 



Fio. 369. Lumbricus. Reproductive organs, ant. sp. res. anterior sperm reservoir ; 

 ant. ves. sem. anterior left vesicula seminalis ; /MM. funnel-like openings of vasa efferentia ; 



i \ int. intermuscular partitions ; mid. ves. sem. middle vesicula seminalis ; n. co. nerve-cord ; ov. 



ovaries ; ov. d. oviducts ; post. sp. res. posterior sperm -reservoir ; post. ves. sem. posterior 



vesicula seminalis ; rec. receptacula seminis ; te, anterior, and te', posterior testes ; v. eff. 



J anterior, and v. eff'. posterior vas eff erena ; v. def. vasa deferentia. (After Vogt and Jung.) 



reservoir. A second pair of vesiculse seminales (mid. ves. sem), 

 situated in the eleventh segment, also open into the anterior 

 sperm-reservoir. A third pair (post. ves. sem), situated in the 

 twelfth segment, unite in front to form the posterior sperm-reservoir 

 (post. sp. res), which lies in the middle of the cavity of the 

 eleventh segment. The posterior pair of testes have the same 

 relation to this as the anterior pair have to the anterior reservoir ; 

 and a posterior pair of ciliated funnels (fun) lead outwards from 

 its cavity. Each ciliated funnel passes into a narrow, somewhat 

 convoluted duct, the vas efferens, and the two vasa efferentia of each 



G G 2 



