252 



CHARLES BADHAM 



60 mm. specimen and in a dissection of an 80 mm. specimen 

 there are only ten pairs. Still, it is not an uncommon thing in 

 leeches for a pair or more testes to be wanting, and Kennel 

 shows in his figure that the 1st and 3rd testis of the right side 

 are wanting. Each vas deferens lies ventral to the testes and 

 runs anteriorly from somite 25 to somite 12 ; here it turns 

 medially and then runs posteriorly to the 18th somite, where 



Text-fig. 7. 



V''' l/d Ne.c. 



Transv'erse section of C . j o s e e n s i s at the level of the 16th somite, 

 showing the relation of the various systems. (x30.) /. Z., intestinal 

 lacuna of the anterior portion of the mid-gut. Ov., ovary. L}}., 

 lateral lacuna. T., testes, first pair. V.d., vas deferens ascending 

 part under testis, descending part ventral to ejaculatory duct. 

 Ej.d., ejaculatory duct. Ne.c, nerve-cord. 



it turns and passes forward as the vesicula seminaHs, a con- 

 voluted tube packed with sperms, which lies with the vas 

 deferens in connective tissue dorsal to the ventral lacuna. 

 The vesicula seminalis develops muscular walls and becomes 

 the ejaculatory duct in somite 15. The ejaculatory duct of 

 either side pursues a convoluted course until it reaches its 

 glandular terminal portion ; this part joins with its fellow and 

 their distal ends form the spermatophore sac which opens into 

 the male bursa (Text-fig. 6, Sp.s.). 



