114 



OLIGOCHAETA 



Pevicliuetci indlca ; or it may be almost absent, as in Perichaeta kesperidum ; 

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



Fig- 3'- 



SPHEEMIDUCAL GLANDS OF VARIOUS OLIGOCHAETA. 



A. Sutroa. B. Moniligaster. C. I'ontodrilus. D. Acanthorlrilus. E. Eudrilus. 

 F. Perichaeta. G. Tubifex. p. Peritoneum. ti. d. Vas deferens. 6. Epithelial 

 lining of apermiduoal gland, a. Glandular cells, m. Muscular layer &p. 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 



