ANATOMY OF SUTROA ROSTRATA. 5 



The testes consist of one pair, situated in segment IX, and attached to 

 the dissepiment between segments VIII and IX. They present small bodies 

 of rather irregular shape (Fig. 14, test.). 



The ovaries also consist of one pair, situated in segment X, and attached to 

 the dissepiment between segments IX and X. They are somewhat smaller than 

 the testes, and of a more regular form (Fig. 14, ov.). 



The oviducts consist of one pair of small cup or funnel-shaped organs (Fig. 

 14, ovd., and Fig. 11). The exterior porus is on the ventral side of the body be- 

 tween segments XI and XII. The interior funnel-shaped part is extremely 

 delicate and translucent. I found the eggs quite frequently in the act of passing 

 out. The oviduct of Sutroa differs from that of Rkyncheimis, in being somewhat 

 more elongated, with a longer and narrower neck. 



The efferent ducts are four, and their funnel-shaped interior openings are 

 all found in segment XI, freely projecting from the dissepiment between segments 

 X and XI (Fig. 17). These efferent ducts are extremely long, extending through 

 some twenty segments, or from XI to XXX or XXXI. They here enter 

 the atrium, which is similarly elongated, extending from segment X to XXXI. 

 The exterior porus of the atrium is situated very near the center of the 

 ventral side of the line between segments X and XI. This enormous devel- 

 opment of the efferent ducts and atrium was previously onl}^ found in 

 Ocnerodrihis.*' 



The efferent funnels are comparatively small (Figs. 6, 7 and 14). 



' I will here take occasion to correct an error in my former description of this latter genus, for which see 

 ••OntheAnalo<vyi'fOcnerodrilus. Dpsala 1878.' The organs which I have there Atscnhei b& seminal receptacles axe 

 nudonbtedly nothing but the atrium. During a visil to Central America, I found four new species of Ocnerodrilus, and 

 a cursory micriscopic inve-tigation showed me immediately thut seminal receptacles existed in several pairs in some of 

 the auterior segments, which makes it evident that the large bodies which open in the same porus as the efferent 

 ducts must be ( outidered as atrium. In the Califoruian species which I described as Ooierodrilus occldenicdis, these 

 small seminal receptacles were evidently overlooked. Prolessor Fr. Vejdovsky, in his admirable work, "System der 

 OligochEeten," page !4i, takes tLie same view of these organs, and refers to them correctly as the atrium. I uow beg to 

 append a correct diagnosis of the genus Ocnerodrilus: Dorsal vestiel weakli) putsatimj, in segments IX and |X; 

 furnished w'th two pairs of stromjly pulsating hi arts. In the eighth segment it emits two iiie tranches which continue 

 toward the cephaic lobe. Ventral vessel is nc(/o»-i<(i, but contiauis Uhdicided to the buccalic stfjment. The stcondaiy 

 vessels are of tao kinds, gastric and perigastric. The perigastric oi.es only connrct with the ventral vtssel. The iffereiit 

 duels are not united with the airium, hut bulh open in the same porus. Semi.nal RECEPTAf'LE.s occur in puirs in scleral if 

 the anterior segments. Te.stes — Tico ])airs in ninth and tenth segments. Two ovidocts in fonrtetnth segment. Ovaries — 

 One pair in (iceljth segnunt. The genus Ocnerodrilus constitutes undoubtedly a distinct fnm ly. 



