Polychaeta.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 239 



The length of the worm is 200 mm. ; diameter of the body at about one- 

 quarter of its length, 5*5 mm. ; and over the parapodia, 9 mm. There are 150 

 segments. 



The extenal anatomy and form of the chaetae agree precisely with Ehlers' ac- 

 count (1904) of this species. The pharynx, however, has the structure described by 

 Mcintosh for N. eatoni. In the maxillary ring, as seen when the organ is slit up 

 along the ventral mid-line and spread out (Plate IX, fig. 1 ), there is, on the right 

 and left, a more or less triangular patch of quite small paragnaths, apex forwards ; 

 this consists of 6 or 7 transverse rows of minute denticles, very closely set, so that 

 each row almost appears as a continuous line. The most anterior line is short, but 

 the lines gradually increase in length till the 7th, which is situated just behind 

 the spot from which the jaw protrudes. Behind this are 3 pairs of short lines, the 

 outer ends, as it were, of long lines which are imperfect in the middle. The extent 

 of the imperfection increases, so that the short lines decrease in length backwards. 

 This triangular patch occupies area IV ; areas I and II are naked ; but in the 

 median ventral area (III) are 4 or 5 transverse lines of still smaller denticles, each 

 line being interrupted at two points by two furrows traversing the area longi- 

 tudinally. 



In the buccal ring the dorsal area (V) is naked ; it is limited on either side by 

 a prominent rounded ridge (VI), on which is a small patch of 3 or 4 imperfect lines 

 of much smaller denticles than those in IV. On the ventral surface, which is divided 

 by several furrows lengthwise, there are 5 little groups of minute denticles ; the 3 

 central groups (probably belonging to area VII) consists of 3 lines, the hinder line 

 being imperfect ; while the lateral group on each side (part of VIII, right and left) 

 present only a single line. 



All these denticles are very small, pale brown in colour, and, with the exceptions 

 of III and IV, require a magnification of 16 diameters for their clear study. 



Localities.— CsLTtiTpheW Island ; (T. J. Parker, 1895 ; H. B. Kirk, 1907). Auck- 

 land Island ; 2 fathoms : Carnley Harbour ; (W. B. B., 1907). Macquarie Island ; 

 (A. Hamilton, 1894). 



Distribution. — Shores of the North and South Islands of New Zealand ; also 

 Magellan Strait, south coast of ChiH, Falkland Islands, Kerguelen, Marion Island, 

 and Femandho Noronha. 



Remarks. — The only member of the genus Nereis found on our shores which 

 exhibits the habit of forming a tube such as that described above is one that has 

 been identified by Ehlers from specimens sent to him by Mr. Suter, and later by 

 myself, collected at several stations, as N. australis, Schmarda. Ehlers, from a com- 

 parison of our specimens with Schmarda's type, was able to add considerably to the 

 short account of the epitokous condition given by Schmarda, and for the first time 

 to describe and illustrate the structure of the atokous phase. 



This Campbell Island individual exceeds considerably the dimensions of the 

 specimens sent to Ehlers ; but it agrees precisely with the descriptions of N. magal- 

 haensis, Kinberg, so far as Mcintosh's account of N. eatoni allow me to judge, not 

 only in the dentition, but in all the other features referred to by him, and Ehlers 

 recognises this species as synonymous with Kinberg's. I therefore proceeded to 

 look through my stock of australis, for in my MS. account of the worms which I had 



