Benham. — Oligochceta from the Southern Islands. 289 



heart is in the 12th segment, as in N. aucklandicus. There are 

 no distinct oesophageal glands. 



Reproductive System. — The long undulating prostates extend 

 through six and four segments respectively, terminating in seg- 

 ment 22. The duct is thick and muscular, and rather swollen 

 at its entrance to the body-wall. 



The penial chseta is rather strongly curved below the tip, 

 as in the allied species, but is more delicate than in either of 

 these. The tip is blunt, as in N. aucklandicus, and the orna- 

 mentation is in the form of pectinated ridges, as in that species, 

 but are not so close together as in the type, nor do they extend 

 so far towards the tip. 



The spermatheca resembles that of N. macquariensis in its 

 globular form and two divergent diverticula. 



Remarks. — This species is evidently very closely allied to 

 N. aucklandicus, yet it differs in several respects from it, and 

 approaches A 7 , macquariensis in these points — viz., in its small 

 size, in the spacing of the chsetse, absence of distinct oeso- 

 phageal glands, form of the spermatheca. 



Although I have given a new specific name to this worm, it 

 may become desirable to consider these three forms as varieties 

 of one species. 



Hab. Campbell Island. In the bottle containing these speci- 

 mens were also some Enchytrceus albidus, Polychseta, and Nemer- 

 tine. They were all collected near one another close to the sea. 



Rhododrilus cockayni, n. sp. 



Seven individuals were collected, of which the majority are 

 sexually mature. 



Colour. — The general colour is a greyish-purple, darker 

 anteriorly, with brown clitellum. The posterior region is very 

 pale, with a purplish-grey line along the dorsum. The body- 

 wall is thin. 



Dimensions. — The specimens have a length of from 100 to 

 150 mm., with a diameter of 3-5-4 mm. immediately behind the 

 clitellum. The segments number 72 in the shorter and 110 in the 

 larger individuals. 



The prostomium is epilobic, about one-quarter, without a 

 transverse furrow. 



The chcetcB : a and b are nearer together than are c and d, 

 and the formula here is aa = be ; dd = led = 3ab ; or ah < cd < 

 be < dd ; while towards the tail ab widens out so that the four 

 chaetse on each side are nearly equidistant. 



The clitellum is saddle-shaped, extending as far downwards as 

 chaeta b, and covers segments 13-17. 



Genital Pores, &c. — The single pair of porophores on the 17th 



19— Trans. 



