ANATOMY OF SUTROA ROSTRATA. 5 
The testes consist of one pair, situated in segment IX, and attached to 
the dissepiment between segments VII] 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 XI]. 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 ARhynchelmis, 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 only found in 
Ocnerodrilus.* 
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 
“On the Anato ny of Ocnerodrilus. Upsala 1878." The organs which I have there describe] as seminal receptacles are 
undoubtedly nothing but the atrium. During a visit to Central America, I found four new species of Ocnerodrilus, and 
a cursory micruscopic inve tigation showed me immediately thit s-minal receptacles existed in several pairs in some of 
the anterior segments, which makes it evident that the large bodies which open in the same porus as the efferent 
ducts must be considered as atrium. In the Californian species which I described as Ocnerodrilus occidentalis, these 
small seminal receptacles were evidently overlooked. Professor Fr. Vejdovsky, in his admirable work, ‘‘System der 
Oligochzten,” page 144, takes the same view of these organs, and refers to them correctly as the atrium. I now beg to 
append a correct diagnosis of the genus Ocnerodrilus: Dorsal vessel weakly pulsating, in segments IX and [X; 
Jurnished with two pairs of strongly pulsating h-arls. In the eighth segment it emits two side branches which continue 
toward the cepha ic lobe. VENTRAL VESSEL ts nut forked, but continucs u.divided to the bucealic s gment. The sccondary 
vessels are of two kinds, GAsTRIc and PERIGASTRIC, The perigastric oxues only connect with the ventral vessel. The «ferent 
ducts are not united with the alrium, but bith open in the same porus. SEMINAL RECEPTACLES occur in puirs in several of 
the anterior segments. TEstES—Two pairs in ninth and tenth segments. T'wo ovipucrs in fourteenth segment. Ovariss— 
One pair in twel/th segment. The genus Ocnerodrilus constitutes undoubtedly a distinct fam'ly. 
