1906.] WORMS OF THE THIRD TAXGANYIKA EXPEDITION. 215 



of the Megascolecid sei-ies and as thus possibly effecting a junction 

 with the highly specialised Eudi-ilids, which are regarded by Rosa 

 and Michaelsen as forming one familj^ with the Megascolecid?e. 

 This point of view, to which I have not myself adhered in the 

 past, is, I admit, strengthened by cei-tain facts which I shall 

 proceed to describe. 



The ovar}'- does not lie absolutely freely in the cavity of segment 

 xiii. A sheath of delicate muscles is prolonged forwards as a tube 

 which possesses a narrow lumen and opens finally by a mouth into 

 the cavitj'' of segment xiv. The lower edge of this mouth is 

 thickened by an increased development of muscular fibre and calls 

 attention to the tube. It appears to me that this tube is the 

 equivalent of the delicate sac and tube leading from it which occurs 

 in Eudrilus and in Stuhlmannia &c. (see my figure of the female 

 reproductive system oi Eiidrilus in P. Z. S. 1902, vol. ii. p. 93, and 

 of Siuhlmannia ibid. 1901, vol. i. p. 35'4). This tube leads from 

 the sac which involves the ovary to the spermathecal sac. As the 

 latter is developed at least in EiMrilas out of the intersegmental 

 septum, and presiunablj^ in StuJilmannia and other Eudrilids, there 

 is no difficulty in comparing an open tube in Ocne7^odrilus with a 

 tube opening into a sac in Eudrilus &c, 



I may conclude with a definition of this new species * : — 



OcNEEODRiLus (Ilyogenia) cunningtoni, sp. n. 



Length about 38 oivm. Setce strictly paired, bifid at extreinity. 

 Glitellum saddle-shaped, xiv.-sviii. (Esophageal pouch but little 

 developed, bifid at end. Last pair of hearts in xi. Dissepiments 

 v./xii. thickened. Sperm-sacs in ix. and xii. ; masses of sperm in 

 X. aiul xi. Atria rather long, extending in the direction of the tail, 

 tvith a disti^ictly separated muscidar duct. Male pores ojjening ujjon 

 a papilla near to ventral pair of setce, lohich are not aborted. 

 Oviduct ivithotct receptacidum ovorum. Spermathecce large and 

 oval, with narrow duct, sharply marked ofi from poiich. 



Hab. Lake Tanganyika. 



AUnroides tanganyikse, sp. n. 



Of this new species I am able to give but an incomplete account, 

 as the collection contains but a single individual. This was 

 mounted entire upon a slide in Canada balsam, and I can only 

 therefore give an account of external characters and of a few internal 

 features which were visible through the thin body- wall. I refer 

 it to my genus Alluroidesf by reason of the position and the 

 structure (so far as I could make it out) of the reproductive organs, 

 and it possesses no character which militates against this placing, 

 as will be evident from the following details which I am able to 



* I do not mention generic and subgeueric characters as defined by Michaelsen. 

 I suspect, however, that the position of the last heart is a generic character, though 

 not nsed by him. 



t " A Contribution to our Knowledge of the Oligochasta of Tropical Eastern Africa," 

 Quart. Journ. Mici'. Sci. vol. xxxvi., n. s. p. 244. 



