Oligochaeta.] SUBANTARCTlC ISLANDS OF NEW ZEALAND. 277 



the return of the expedition. Some two or three dozen were collected by Mr. 

 Chambers, who lived on the island for some months in the early part of 1908. I 

 will, therefore, add a few notes to my original account. 



Colour. — The anterior, preclitellar, region is whitish, or very pale grey ; there 

 is no pigment, but the thick wall is opaque ; posteriorly, where the wall is thin, the 

 intestinal contents are visible through it, so that a grey colour results (in formol), 

 as in life. The clitellum is pale orange-brown, the colour being retained in formol 

 better than in alcohol, in which the type was preserved. 



The dimensions of the mature worm vary from 50 mm. by 2-75 mm. to 85 mm. 

 by 2 mm. ; the number of segments from 45 to 122 ; but, as in other cases, the 

 longest worm has not necessarily the most segments, partly, no doubt, owing to 

 differences in the method of killing and preservation. Thus: Length 80mm., 90 seg- 

 ments ; length 75 ram., 122 segments (and this is soft, so that it is really shorter) ; 

 length 65 mm., 118 segments. 



Of the internal anatomy, the only organ to which I will draw attention is the 

 spermatheca, the diverticulum of which is, in several individuals, roughened at its 

 apex, from the number of chamberlets which beset it ; this is especially well seen 

 in empty spermathecae. 



Localities. — Auckland Islands : (a.) Bush soil ; North Arm of Carnley Harbour ; 

 (W. B. B.). (6.) 300 ft. above sea-level ; (W. B. B.). (c.) Adams Island ; Fair- 

 child's Garden ; (Aston), (d.) Adams Island ; 2,000 ft. above sea-level ; (Speight), 

 (e.) Enderby Island ; near shore; (W. B. B.). — Campbell Island: (W. K. Chambers). 



Leptodrilus magneticus, sp. nov. (Plate XI, fig. 22.) 



A solitary individual was collected, with several other species, at the magnetic 

 station No. 1, at Camp Cove. It differs from the preceding in the following points : — 



The dimensions are greater, the length being 133 mm. by 2 mm., with 130 seg- 

 ments. 



Chaetal formula : be = 2 ab < aa ; be slightly greater than cd. 



The clitellum occupies segments 13 to J 16. 



Small paired tubercula pubertatis on the 13th and 14th segments, post-chaetal 

 in position ; and a median one on the 19th. 



There is but one pair of spermathecae, in the 8th segment. 



The penial chaetae are more strongly bent than in the preceding, and resemble 

 those of Rhododrilus cockayni. 



Rhododrilus, Beddard, 1889. 



Rhododrilus cockayni, Benham. 



1905. Trans. N.Z. Inst., xxxvii, p. 289. 



The distribution of this species, which occurs both on the Auckland and Camp- 

 bell Islands, is of interest owing to its " euryhaline " nature, which, being inter- 

 preted, means that it can withstand considerable changes in the salinity of the 

 water, and thus may occur on or in the immediate neighbourhood of the sea-shore. 

 I found it in great numbers at the head of the North Arm of Carnley Harbour, 

 below high-water mark ; on the other hand, it also occurs on hills, as on Mount 

 Honey, on Campbell Island. 



