114 



OLIGOCHAETA 



Perichaeta indica; or it may be almost absent, as in Ferichaeta lesperidum; 

 probably, though I have no positive data upon the subject, it is extrusible and 



Fig. 3'- 



SPHERMIDUOAL GLANDS OF VAEIOUS OLIGOCHAETA. 



A. Svtroa. B. Monaigaater. C. Pontodrilus. D. Acanthodrilus. E. Eudrilus. 

 F. FeriOmeta. G. TuUfex. p. Peritoneum. v. d. Vas deferens. b. Epithelial 

 lining of spermidnoal gland, u. Glandular cells, m. Muscular layer sp. Spermatozoa. 



performs the function of a penis. In any case, whatever its function may be, it 

 seems to be fairly comparable to the terminal muscular sac of the Eudrilidae and 



