WORMS. 



479 



in the ovary, and in those situated on the posterior segments of 

 the body they generally present a brownish colour, which renders 

 the form of their receptacle sufficiently 

 conspicuous. In segments which have 

 been expelled separately, we have ob- 

 served the ovary to be nearly empty ; 

 and it is in these that the male duct 

 and gland are most easily perceived. 

 For this purpose, it is only necessary 

 to place the segment between two 

 slips of glass, and view it by means 

 of a simple lens magnifying from 20 

 to 30 diameters. A well-defined bine 

 (</), more slender and opaque than the 

 ' oviduct, may then be traced, extend- 

 ing from the termination of the ovi- 

 duct, at the lateral opening, to the 

 middle of the joint, and inclined in a 

 curved or slightly wavy line to near 

 the middle of the posterior margin of 

 the segment, where it terminates in a 

 small oval vesicle. This, as seen by 

 transmitted light, is subtransparent in 

 the centre, and opaque at the circum- 

 ference, indicating its hollow or vesi- 

 cular structure. The duct, or vas de- 

 ferens, contains a grumous secretion; 

 it is slightly dilated just before its 

 termination. In this species, there- 

 fore, the ova are impregnated on 

 their passage outward." — (Cyclopaedia of Anatomy, art. Untozoa.y 



