BY ^•. A. HASWELL. 99 



In the living- condition the eolouring of thi.s species renders it readily capable 

 of recognition. In preserved specimens in which the colour is lost, the most 

 striking features are: — (1) the presence in the anterior region of the body of an 

 impressed line or narrow groove running transversely across the dorsal surface of 

 each segment; (2) the deeply bi-lobed character of the parapodia; (3) the imper- 

 fect segmentation of the dorsal cirri. 



In the living condition the body is greenish-yellow or light yellow with 

 greenish transverse lines. On the doi-sal surface just behind the head is a patch 

 of white, and on each segment is a pair of very light yellowish- or greenish-white 

 dots. The head and the palpi are red, the eyes crimson. 



The length of the largest specimens is 6 cm., the breadth in the uncontracted 

 state only 2-3 mm. In all the anterior part of the body, as far back as the be- 

 ginning <.)f the intestine, are tlie transversa grooves above refen-ed to, appearing 

 in contracted specimens as notches in the lateral edges of the segments (Plate 

 sdi., flg. 1). 



Sensory cilia are present on the tentacles and cirri and the ends of the 

 palpi . Vibratile cilia occur on the palpi and on the sides of the segments. The 

 ■whole integument is full of small oval glands. 



The peristomium is bilobed, the lobes ,-ounded on the dorsal aspect. The 

 eyes are rather small, the posterior much the smaller. The palpi are twice the 

 length of the prostomium when fully extended; they are fused together at the 

 base for a short distance. The prostomial tentacles are usually sub-equal, a 

 little longer than the palpi, segmented, but not very distinctly. 



The parapodia (Plate sii., fig. 2) are very deeply divided into anterior and 

 posterior lobes. There are about 20 compound setae (Plate xi., figs. 23 to 26), 

 all with long and rather narrow falees which are bidentate and have extremely 

 minute teeth along the cutting eclge. On the posterior segments there is a very 

 tine, truncate, simple seta on each parapodium dorsal to the compound setae. 

 Theie are two, sometimes three, acieula of which one, the most anterior (tig. 27), 

 is sharply bent foi-wards at the end and the others are obliquely truncate or 

 obliquely pointed. No capillary setae have been seen. The dorsal cirri are 

 rather short, very imperfectly segmented. 



The pharynx runs through only three to six segments, the proventriculus 

 usually only through three or four. 



Stilis (Typosyllis) coru.scans Haswell. (Plate xi., figs. 28-31). 



Syllis corruscans, Haswell, (25), p. 734, PL 1., fig. 1-3. and Iv., fig. 5. 



? Syllis corruscans Hasw., Augener, (1), p. 208. 



This is the largest of the Australian Syllids, attaining a lengih of as much as 

 14 em. with a maximum breadth of about 5 mm. There are 150 to 200 segments. 

 The colour of the dorsal surface is usually dark green, sometimes dark brown; 

 that of the ventral surface and of the parapodia and cirri light red or orange. 

 The prostomium is bright crimson. On the dorsal surface of the peristomium ap- 

 pears a bright green spot or band. 



The integ-umentary glands are so arranged and developed as to give a corru- 

 gated appearance to the darkly-pigmented dorsal surface, the eoiTugations being 

 sometimes arranged in transverse rows, two or three on each segment with narrow 

 furrows between. 



The breadth of the prostomium is nearly twice the length. It becomes partly 

 withdrawn under the prostomium when the animal is touched or irritated. The 



