BY T. HARVEY JOHNSTON. 63 



everted, a very prominent genital eminence was visible. Eversion 

 was only seen in segments in which egg-formation had already 

 begun, but it is probable that no significance is to be attached to 

 this occurrence. A vesicula seniinalis was not present. 



The female organs consist of the usual glands and their asso- 

 ciated ducts, the whole complex occupying the centre of the 

 sexually mature segments, and lying just anteriorly to the testes. 



The ovarv is situated just in front of the middle t)f the pro- 

 glottids lying symmetrically, and may attain a breadth of 0-19 

 mm., though it is generally rather less than this. It consists of 

 two "wings" connected by a relatively long " bi-idge," above 

 which pass the male and female ducts. Each wing oi- lobe is 

 made up of several short, thick, slightly branched tubes. In a 

 transverse section of the segment, the ovaiy apj^ears as a horse- 

 shoe-shaptfd body with the free ends widened, these being the 

 (jvarian lobes. The bridge is ventrally placed, lying adjacent to 

 the ventral set of transverse nuiscles; while the lobes project 

 upwards, their main mass lying in the middle of the medulla, and 

 their extremities in the dorsal portion of the medulla, at about 

 the same level as the testes. Some of the lattei', however, lie 

 still inoi-e dorsally, being located adjacent to the dorsal layer of 

 transverse muscles. The ovarian cells are large, rounded and 

 finely granular, with a large, round nucleus containing an eccen- 

 trically-placed deeply-staining nucleolus. From the middle of 

 the oviirian bridge there passes off" dorsally, the oviduct. This 

 canal forms a small arch dorsally, and then passes ventrally foi* a 

 very short distance to eniei' the fertilising duct immediately 

 behind the ovarian bridge. 



The vitelline gland is seen to be a compact organ, with a very 

 coarsely granular appearance. It has an irregularly rounded or 

 transversely elongate form, and is situated in the middle just 

 behind the ovary. Its size is about 0*086 mm. broad, by 00G5 

 mm. long. When examined in tiansverse section, it is seen to 

 be situated between the ventral limit and the middle of the 

 medulla. It thus stands at about tlie same level as the ovarian 

 bridge, but, on account of being thicker, its dorsal part lies at 



