10 G. Eisen, 



largest eggs are always found nearest the upper margin of the (jrgan. 

 No eggs are ever seen floating in the perivisceral cavity; on the con- 

 trary they seem to entre the oviducts immediately after having left 

 the ovary. 



The oviducts are two, one on each side of the ventral nervetrunk 

 in the 13"' setigerous segment. Its exterior porus is not situated beticeen 

 the segments, but in the middle of the segment, close to the two inferior 

 spines. Fig. 20. The whole organ is considerably larger than that of 

 any previously known Lumbriculide genus, and nearly reaching the size 

 of the ovaries or testes. Its interior opening is engaged in the disse- 

 piment between the 11*'' & 12"' segments. Their form is somewhat re- 

 sembling that described by Claparède as belonging to Stylodrilus '). I 

 have frequently found the funnelshaped opening full of matured eggs, 

 which fact clearly showed the function of the organ. 



The receptacle reaches an enormous development and occupies 

 the whole length between the IG"* & the ^ö"* segments, or sometimes 

 even more. It opens in the 16"* segment, in the same porus as the 

 efferent ducts, and has the shape of a very long and narrow bag, with 

 thick walls, in which the cells and cellnuclei are plainly visible. Fig. 4, 

 11 & 12. The interior lumen of the organ is comparatively narrow, 

 being broadest in the middle and narrowest at the genital porus. Fig. 3 

 & 4. The junction of the receptacle and the efferent ducts takes place 

 at the very opening of the genital porus, neither forming any atrium or 

 cloaca. Fig. 18. 



Of the genus Ocnerodrilus only one species is known, which I here 

 describe under the name of 



OCNERODRILUS OCCIDENTALIS n. sp. 



Special characteristics the same as those of the genus. The spines 

 are not forked but entire, like those of Rhynchehnis, and 8 in every 

 segment. 



The size of the worm in contracte state is about 2'""'' wide by 

 2Qmin. iQ^g_ J^ extended state the worm is longer and narrower in pro- 

 portion. The colour is that of rawmeat, and the worm presents the 

 general appearanae of a small Lainbriculu><^ as A. tenuis or allied species. 

 Its motions are extremely slow, and quite the contrary to those oî Lum- 



') Claparède, Koch. anat. 1^1. 4. Ws,. 17. 



