1906.] WOEMS OF THE THIRD TANGANYIKA EXPEDITION. 215 



of the Megascolecid series and as thus possibly effecting a junction 

 witli the highly speciaHsed Eudrilids, which are regarded by Rosa 

 and Michaelsen as forming one family with the Megascolecidfe. 

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

 past, is, I admit, strengthened by certain facts which I shall 

 proceed to describe. 



The ovary 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 cavity 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 occui-s 

 in Eudrilus and in SttMmannia kc. (see my figure of the female 

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

 of Sluhlmannia ibid. 1901, vol. i. p. 354). This tube leads from 

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

 latter is developed at least in Etidrilas out of the intersegmental 

 septum, and presumably in Stiohhnannia and other Eudrilids, there 

 is no difiiculty in comparing an open tube in Ocnerodrilus with a 

 tube opening into a sac in Eudrilus &c. 



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



Ocnerodrilus (Ilyogenia) cunningtoni, sp. n. 



Length about 38 mm. Setce strictly 2Kiired, bifid at extremity. 

 CliteUum saddle-shaped, xiv.-xviii. (Esophageal pouch but little 

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

 v./xii. thickened. Sperm-sacs in ix. a7id xii. ; masses of sperm in 

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

 toith a distinctly separated muscular duct. Male pores opening xipon 

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

 Oviduct loithout receptactolu7n ovorum. Spermathecce large and 

 oval, with narrow duct, sharply marked off from pouch. 



Hab. Lake Tanganyika. 



AUuroides 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 i-efer 

 it to my genus AUuroides -f 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 b}' Michaelsen. 

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

 not used by him. 



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

 Quart. Journ. Micr. Sci. vol. xxxvi., n. s. p. 244. 



