ANATOMY OF SUTROA ROSTRATA. T 
oped. In the albuminous gland, however, I have searched in vain for any, though 
I must confess the number of specimens at my disposal has been very small. 
The segmental organs are found in all the segments posterior to XII. They 
consist of long slender organs, the body of which is destitute of any glandular 
appendices or cells similar to those found in Rhynchelmis. The interior opening of 
the organ is surrounded by brown glands, behind which there is a larger head-like 
enlargement of similar structure to the duct proper (Fig. 12). 
The spines are eight in every segment and occur in four pairs. They are 
J 
slightly S-shaped, entire, not forked (Fig. 13). 
EXPLANATION OF THE FIGURES. 
Puate I. 
Fig. 1. Sutroa rostrata, natural size. 
Fig. 2. Front part of the worm, with the cephalic lobe, showing its filiform 
elongation, 
Fig. 3. Transverse section of the body of a quadrilateral specimen. 
Fig. 4. The front part of the worm, showing the vascular or circulatory 
system. The dorsal vessel is represented red; the ventral 
vessel, blue. 
d. pr. v.: dorsal perigastric vessel. 
v. pr. v.: ventral perigastric vessel. 
The twelfth to fourteenth segments, showing the vascular system 
Or 
Fig. 
in those segments. 
ac.: alimentary canal. 
dv.: dorsal vessel. 
d. pr. v.: dorsal perigastric vessel. 
d. gr. v.: dorsal gastric vessel. 
Fig. 6. The efferent ducts and atrium. 
ps.: penis. 
eff. d.: efferent ducts. 
atr.: atrium. 
Fig. 
SI 
Efferent funnel more magnified and seen in different aspect. 
