1132 DR. J. STEPHENSON ON THE OLIGOCHiETA OF THE 



about one-third greater than the breadth. The posterior border 

 is very slightly indented, and the posterior angles are well 

 rounded. 



The testis consists of numerous lobes or divisions, each contained 

 in a definite sac ; in each sac the distal portion of the contents 

 consists of morulse and developing spermatozoa. The lobes are 

 contained in segms. x. and xi.; they originate from the parieteson 

 both sides of the attachment of the septum. JSTumbers of sperma- 

 tozoa are free in segm. xii. at and behind the level of the penial 

 bodies and as far back as the hinder end of the segment. 

 Numerous cysts containing developmental stages of parasites 

 occur amongst the testis-lobes. 



In two specimens from which the male deferent apparatus was 

 isolated by the method of dilaceration, the funnels appeared to be 

 only a little longer than broad — not more than half as long again 

 as broad. In one specimen, in which they were well seen, they 

 were rather triangular in shape, the posterior end (where the vas 



Text-figure 5. 



^ amp. 



d. 



coaq. oes. 



Spermathecse and intervening part of oesophagus of lyuhricillus necropJmgtis, 

 isolated by dilaceration. Amp., ampulla ; coag., coagulum in ampulla ; d., duct ; 

 gl., mass of gland-cells ; oes., oesophagus. 



deferens is given ofi") being narrow. In sections also the funnels 

 appeared short and stumpy, the proportions varying, but 

 apparently most often about half as long again as broad. 



The vas deferens is narrow, 8 ^, and is confined to segm. xii. ; it 

 is tightly coiled, and is seen in sections as a number of windings 

 squeezed close against the body- wall. The penial body is of the 

 lumbricilbd type, ovoid, somewhat flattened vertically, -19 mm. 

 long and •14 mm. high. 



The large ovary, in segm. xii., is also branched into lobes. 



The spermathecal ampulla is shortly and stoutly pear-shaped, 

 drawn out above into its oesophageal connection ; there appears 

 to be a communication between the cavities of the spermatheca 

 and of the esophagus. The duct is well marked off, longer than 

 the ampulla, and surrounded by a large lobed mass of gland-cells 

 which fills up the space between the parietes and the base of the 

 ampulla (text-fig. 5). 



Copulatory glands occur in segms. xiv. and sv. They are small, 



