COLLECTED BY THE SCOTTISH NATIONAL ANTAKCT1C EXPEDITION. 45 



is dull purplish-brown like the head. In the other the body is practically unpigmented, 

 although the head agrees with the above description (v. fig. 3). 



The proboscis (figs. 4, 5) was in both cases retracted, but owing to the good 



preservation of the specimens, examination by dissection gave very satisfactory results. 



The two were found to be identical as to the form and arrangement of the paragnaths. 



These, numerous, black and conical, and of very diverse size, are arranged as follows : — 



I. An irregular area of numerous very minute black points, with a few larger 



ones situated medio -anteriorly. 



II. A closely-packed triangular group of about fifteen large paragnaths. 



III. A small close-set transverse group of about ten, of fairly large size. 



IV. About twenty-five, of varying size, forming a transversely-elongate group. 

 V. One large median paragnath. 



VI. One large paragnath, slightly elongate transversely. 



VI I. -VIII. A wide band of very numerous cones, smallest and most numerous in 



the mid- ventral region, becoming fewer and larger towards the dorsum and 



also towards the anterior margin of the belt, and extending dorsalwards 



nearly to VI. 



The jaws are nearly black, opaque, with one big " tooth " or notch near the tip, the 



remainder of the cutting edge being only slightly crenate (fig. 6). 



In the anterior region of the body the lobes of the parapods are short, stout, 

 rounded, and of more or less even size. Proceeding towards the posterior end, a 

 gradual transition of form takes place ; the base of the dorsal ligule becomes enlarged 

 and more enlarged, assuming an oblong form and carrying the cirrus with it ; the 

 rounded tip of the ligule projecting below the cirrus becomes less prominent. At the 

 same time the lower lobes of the parapod are reduced in size, especially the ventral 

 ligule (figs. 8-9). Thus the outline of the parapods changes gradually from a quad- 

 rangular to a triangular one. 



The setse, numerous, short, closely-packed, and of a horny yellow colour, are thus 

 distributed :■ — 



A. Notopodial bundle : homogomph spinigers. 



B. Upper neuropodial bundle : homogomph spinigers (above). 



,, ,, heterogomph falcigers (below). 



C. Lower neuropodial bundle : heterogomph falcigers. 



The heterogomph spinigers which appear on the upper margin of C in most species 

 of Nereis have apparently been eliminated. The bristles do not vary appreciably in 

 form from the 1st parapod to the 70th at least. The falcigers have stout shafts, and 

 short stout appendages (fig. 10). 



In the general external form, and in the characters of the parapodia, setae, and the 

 prostomium and its appendages, the present species closely resembles N. variegata Gru., 

 and others of the same group : N. marionii A. et E. (11, p. 295), N. melanocephala 

 Mint. (10, p. 216), N. (Pseudonereis) anomala Grav. (7), N. ruficeps Ehl. (6), 



