272 



SUBANTARCTIC ISLANDS OP NEW ZEALAND. 



[Oligochaeta. 



The diteUum usually covers segments 14-17, though in one case the 13th segment 

 was glandular, while in others the 17th was not. 



There is a considerable amount of variation in the number and position of the 

 tubercida puhertatis ; though typically they are paired, yet often only one of a pair 

 is present. The typical arrangement seems to be as follows : A pair on each of the 

 segments 17, 18, 19, and 20, sometimes also on 16 and 21 ; these are in the neigh- 

 bourhood of chaeta a, usually prechaetal in 17, 18, 19, and 20, post-chaetal in 16 ; 

 but these positions are not quite constant. In addition, there are preclitellar 

 tubercles on segment 10, and in one case on 8 as well ; these are post-chaetal. 



The dorsal pores commence at 11/12 ; and the nephridial pores, instead of being 

 in line with chaeta c, as I described in 1902, are in reality a little distance below this 

 line, as can be seen both in trans-sections and on the flattened skin. 



Internal Anatomy. 



I must add to the facts recorded in my previous paper the following : — 



A small gizzard is present in the type, which I overlooked till I had noted it in 

 the new specimens. It is situated in the 5th segment, and 

 is concealed by the dorsal wall of the pharynx. Being no 

 broader than the oesophagus, it was only in bisected 

 worms that the thick cuticle and compact musculature 

 became evident ; of course, in longitudinal sectioris it is 

 readily recognisable. 



The oesophageal glands in the 13th and 14th segments 

 are not always definitely rounded, but the tube is here 

 somewhat dilated and the walls lamellate ; it narrows in 

 the loth, and the intestine commences in the 17th segment. 



I have also to note that there is a third sperm-sac in 

 the 9th, of small size. 



The two penial chaetae in each bundle are slightly 

 different from one another — one (a) is broader, of deeper 

 colour, and bluntly pointed (this was figured in 1903, 

 pi. xxvi, fig. 10) ; the second (6) is rather finer, tapering, 

 and more sharply pointed. Both are slightly bent at 

 about the level of the surface of the body. The orna- 

 mentation extends nearly to the apex, though in those 

 which have been worn it ceases some little way below the 

 end. 



Localities. — Adams Island ; on the Pleurophyllum 

 meadow, or Fairchild's Garden, as it is usually termed. 

 Camp Cove magnetic station ; a flat piece of grassy 

 ground just about a foot or so above sea-level. Masked 

 Island ; among the roots of Stilbocarpa pdaris (Aston). Under logs in various parts 

 of Auckland Island. 



NoTIODRir.OS ADCKLAXniCUS. 



The pair of i)eiiial chaetae ; the 

 curved transverse line represents 

 the surface of the body ( X 100) ; 

 and the tip of slender chaeta en- 

 larged ( X 2.50). 



Var. bollonsi, n. v. 



Two worms were collected for me on Disappointment Island by members of the 

 expedition. 



One of them is a variety of N. aucMandicus. It is paler than the majority of the 

 typical individuals, and has a different spacing of the chaetae, in that aa is less than 



