6 Gustaf Eisen, 



form. The regularity and beauty of this structure can only be compared 

 with that of skeletons of certain Diatomes. These spermatozoa-cysts are 

 not unlike the spermatophores of Tabificidœ. 



The ovaries occur in 3 pairs and are of very diminutive size. 

 (PL I. fig. 1.; PI. II. fig. 11). The anterior pair is found in the 3"* seg- 

 ment, attached to the dissipiment between this and the 4"" segment. 

 The second pair is similarly found in the 9"' segment, attached to the 

 dissipiment between the same and the 8 segment. The last or 3"" pair 

 is found in the 10"' segment, attached to the dissipement between the 

 same and the 9"' setigerous segment. 



The form of the ovary is variable, still the ovaries of the same 

 pair is mostly of the same shape, sometimes resembling a bagpipe, 

 sometimes again more like a complicated S. The matured ova are always 

 situated at the free margine of the ovary, but even they are of such 

 diminutive size, that they even when fully developped are only 2 or 3 

 times larger than the smallest ovula in the ovary. 



As oviducts (PI. I. fig. 6 &' 1) I consider two very minute and 

 extremely delicate organs, of a shape somewhat similar to the oviducts 

 of the genera of Lunibriculidœ, and which are situated in the 9"" segment. 

 The exterior porus of the oviduct is found between the segments 9 & 10, 

 in a line between the spines and the porus of the efferent duct (PI. I. fig. 4. 

 ovd.). The oviduct is funnel-shaped with a proportionately large globular 

 and bladderlike interior orifice. This latter is not furnished with vibrating 

 ciliai, which are wholly restricted to the interior tube of the organ. 



The receptacle (PI. I. fig. 1 & PI. II. f. 12) consist of two large 

 chitinous bodies, situated in the 8"' setigerous segment, and whose ext- 

 ernal porus opens a little behind the spines of that segment. Each re- 

 ceptacle consists of two distinct parts, the interior of which is inflated 

 and egglike, — the receptacle proper — and one more narrow tubelike 

 part, coniiectiug the former with the exterior porus of the organ. 



The receptacle shows a great siinilarity with the same organs of 

 Tubificidœ and Lumhriculidœ. Its interior cavity is nearl)'^ always full of 

 free spermatozoa with long and sharply defined tails. 



The efferent ductft are 2, of enormous size, occupying the segments 

 9 to 14. The exterior porus of the duct is situated in the 9"" segment 

 just behind the ventral spines. Each efferent duct consists of two large, 

 rather cylindrical, sacklike ducts of nearly equal size, which at the 

 extremities are connected by a narrow, short tube, of the same general 

 structure as the rest of the organ, except being surrounded by spiral 

 muscles (PI. II. fig. 13 & 14. spr). 



