1914.] J- Stephenson : Oligochaetu. 403 



f and i are absent; §, to, and fr are stout, the last especially so. 

 Septum H is apparently represented only by a sheet of connective 

 tissue which attaches the inner surface of the seminal vesicle to 

 the alimentary tube, i.e. it does not exist between the seminal 

 vesicle and the body-wall ; this is liable to cause a temporary 

 confusion in estimating the sequence of the segmsnts and the 

 organs contained in each ; the number and position of the hearts 

 in this region however will indicate the true numbering. Behind 

 this the septa are thin. 



The firm globular gizzard is situated in the space between 

 septa f and t- 



The last heart is in segment xiii. 



The nephridial system is micronephric. There are numerous 

 small nephridia on the body-wall ; large bunches of nephridial 

 tubes are attached to the dorsal body wall in segment iii. 



The testes and funnel of each side are enclosed in a sac, which 

 apparently communicates with the one of the other side beneath 

 the gut. The sac is situated in segment xi, and is attached to the 

 posterior face of the very stout and muscular dissepiment li, 

 deeply ventral in the segment. The testis is small, the funnel 

 large and iridescent; the vas deferens is of moderate thickness, 

 and passes back on and attached to the ventral body- wall, swelling 

 out to form a small sac at its termination in segment xvii. 



The vesiculae seminales are granular-looking elongated late- 

 rally compressed bodies, lying one on each side of the gut in 

 segments xii and xiii. They are limited behind by septum H . 

 which is bulged back by them ; they almost meet each other along 

 the mid-dorsal line, the dorsal vessel intervening. They are 

 connected with the side of the gut by a broad connective tissue 

 stalk towards their anterior end. 



The prostate has the form of a long thick coiled tube ; it is of 

 large size, occupying segments xvii-xxi. In the last portion of its 

 course it is, with many windings, directed inwards, its terminal 

 portion being rather smaller in diameter than the main part of the 

 tube; it ends close to the end of the male duct, in front of and 

 internal to the latter, which passes underneath the prostatic tube 

 just before its termination. 



The ovary is of moderate size, with numerous branches, and 

 is attached to the posterior face of septum il. The funnel lies 

 internal to the male duct. 



The spermathecae are irregularly massive in shape, firm and 

 solid, lying against the body-wall in a region which corresponds 

 externally to segment viii ; the anterior part gets into the region 

 of vii. The longer axis of the ampulla is antero-posterior ; the 

 duct is short and broad, terminating in furrow v. At the junction 

 of ampulla and duct, between ampulla and body- wall, is the lobed 

 iridescent semi-circular diverticulum ; the appearance may be des- 

 cribed by saying that it appears to be constituted by a semi- 

 circular row of small diverticula, close together and fused margi- 

 nally with their neighbours. 



