104 



S. HATAI. 



IX 



XI 



XII 



XIII 



XIV 



XV 



Cut ï. 



a. Atrium, Ov. Ovary. On. Ovi-eac, Sep. Septum, 



Sp. Sperm-sac, Sp.c. Spernoiducal chamber, 



Spf. Sperm-duct funnel, Sp.th. Spermatheca, t. testis. 



decrease as we proceed anterior- 

 ly. From the fifth segment on 

 they appear to he entirely 

 absent. 



The cœlomic corpuscles are 

 very numerous in segments II — 

 X and hides the internal organs. 

 In segment XI they are few, and 

 gradually decrease in the more 

 posterior segments, being very 

 few in the^segments next the 

 anus. 



The septa are thick ; they 

 are all set transversely to the 

 alimentary canal, and are not 

 funnel-shaped as is the case in 

 the anterior segments of most 

 other Oligochaetes. 



Genital System. 

 The genital organs present 

 several points of difference from 

 those of V- pilosus. I shall there- 

 fore describe them separately. 



1. Testes. — One pair of 

 testes are attached to the pos- 

 terior face of septum IX/X, but 

 a small portion of each testis 

 projects into segment IX. The 

 form varies according to deve- 

 lopment, but the posterior portion 

 is usually finger-shaped. 



2. Sperm-sac. — This is a 

 single large sac extending from 

 segment IX to segment XIII, 



