274 



SUBANTARCTIC ISLANDS OP NEW ZEALAND. 



[OKgochaeta. 



phagus is dilated in 11 and 12. with lamellate walls; in 13, which is constricted 

 from the last, the wall has the same structure, but the tube is much compressed ; 

 it narrows in the 14th ; and in the next segment, the 15th, the tube widens to become 

 the intestine. 



As in the preceding species, there is a small sperm- 

 sac in the 9th segment, as well as in the 11th and 12th. 



The penial chaetne differ from those of N. aucklandi- 

 cus. The two chaetae of a bundle are about equal in 

 length and thickness, but exhibit a difference in curva- 

 ture, one being more sharply bent than the other. Both 

 are finely pointed, and herein I was in error in my original 

 account, where I stated that " the tip is blunt." I find 

 that I had mistaken a chaeta from a specimen of N. 

 aucMandicus, collected on the Campbell Island, for that 

 of the present species. A re-examination of the type and 

 of other individuals shows that both are finely pointed, 

 and the ornamentation extends nearly to the tip, but, 

 being much finer than in the preceding species, is easily 

 overlooked in a worn bristle 



In my original account of this species (1904, p. 289) 

 I indicated the slight amount of difference between it and 

 N. aucJdandieus and N. macqiiariensis. After a renewed 

 study of each of them I am convinced that they are dis- 

 tinct, as indicated by differences (slight perhaps, yet con- 

 stant) in chaetal formula, penial chaetae, &c. Apparently 



N. campbeUianus is more nearly allied to N. macquariensis than to N. aucMandicus, 

 as seen in the size of the worm, the chaetal formula, penial chaetae, and spermatheca. 



A comparison of the chaetal formula of N. aucMandicus and N. campbeUianus 

 can be made by reducing the interchaetal spaces to some common term. These 

 spaces were measured on the flattened skin by means of an eye-piece micrometer in 

 a number of specimens of each species. Taking dd equal to 24, the spaces are, — 



NoTIonillLDS CAMPBELLIANUS. 



The pair of |)cniil cliaetae. The 

 fiirved transverse hue represents 

 the surface of the body (XlOO); 

 also the tip of tlic chaetae further 

 enlarged ( X 2oO). 



There is no doubt that N. macquariensis differs from both the others in having 

 the nephridiopore in the same line as chaeta c — not below it, as in the other two ; also, 

 the dorsal vessel is double up to the 11th; the oesophagus is dilated in the 16th 

 segment. 



Localities. — Campbell Island ; (W. B. B. ; February, 1907). Auckland Island; 

 in logs ; and bush soil on shore of Carnley Harbour ; (W. B. B. ; November, 1907). 

 Enderby Island ; in logs ; (W. B. B.). 



