BY J. J. FLETCHER, M.A., B.SC. 969 



Ilab. — Darnley Island, Torres Straits (Macleay Museum, from 

 the ''GheverV Expedition). 



PERICHiETA PEREGRINA, n. Sp. 



The largest specimen comprising about 108 segments when alive 

 and moderately extended was 1 9 cm. long ; after being not unduly 

 contracted in spirit it was 13 cm. long, 5 mm. broad, the length of 

 the preclitellar portion being 18 mm. Body cylindrical ; the seg- 

 ments show only faint indications of division into annuli. Colour 

 above of a nearly uniform brown with a tinge of green, lighter 

 below. Prostomium pear-shaped, depressed, extending well back 

 on the buccal ring (for about | of its width). 



Clitellum comprising three segments (xiv to xvi), complete all 

 round ; on the ventral portion of xiv is a small area different in 

 colour or an elliptical depression carrying the two apertures of the 

 oviducts which are close together. Setae visible on the clitellum. 



Setae about "42 m.m. long, with a slight enlargement at \ from 

 free, end from about 40 to 46 per segment, most numerous in the 

 posterior portion of the body, arranged in complete circles on the 

 setigerous segments, not on such conspicuous ridges as in the other 

 two species. Segments setigerous except the first and the last. 



Male pores two, conspicuous transverse slit-like apertures in the 

 line of setae ; with about 14 setae on the ventral surface between 

 them ; in one specimen only were they on papillae, but probably 

 in the breeding season such are developed. Apertures of oviducts 

 two, close together on xiv. Apertures of spermathecae four pairs, 

 between segments v and vi, vi and vn, vn and viii, and viii and 

 ix, in a line with about the seventh row of setae on each side. 

 Dorsal pores after xi. 



The pharnyx occupies about four segments ; the oesophagus 

 occupies v, vi and vn ; the gizzard occupies two or two and a half 

 segments (viii and ix and part of x) the first two of these segments 

 also containing the posterior two pairs of spermathecae ; the 

 mesentery between viii and ix as also that between ix and x 

 -entirely absent, the first complete one behind the gizzard being the 



