Benham. — Oligochata from the Southern Islands. 291 



the " ampulla," though in the young form and in the anterior 

 sacs it is shorter. 



Hob. Campbell Island; Ewing and Adam Islands of the 

 Lord Auckland Group. 



Rhododrilus leptomerus, n. sp. 



This peculiar species is represented by two mature indivi- 

 duals collected "on moss (? Auckland Islands)." 



Colour. — Pale-yellowish, with a white clitellum. 



Dimensions. — Length, 75 mm. ; breadth, 3 mm ; with 82 

 segments. 



Prostomium epilobic, one-half, with a posterior transverse 

 groove. 



Chcetce in couples, the individuals of the ventral couple 

 being rather near, the other spaces wide : aa = be = cd = 2ab ; 

 dd = lfaa. 



The clitellum, is saddle-shaped, and covers segments 13 to 16 ; 

 it has well-defined margins anteriorly and posteriorly, and ap- 

 pears to be fully developed, as the intersegmental furrows are 

 obliterated except on the ventral surface. 



Genital Pores, &e. — A single pair of porophores occurs on 

 the 16th segment in line with chgeta b : it is only feebly promi- 

 nent, and on it are three pores, as in other species of the genus — 

 viz., one common to the sperm and prostate ducts, the other 

 two for the two penial chsetae. There are no copulatory tubercles. 

 There is a single pair of spermathecal pores between segments 

 7 and 8. Nephricliopores in line with chseta c. 



Internal Anatomy. — There are no thickened septa. The only 

 notes on the vascular system are from longitudinal sections, 

 which show two pairs of hearts, in segments 10 and 11 respec- 

 tively, of which those in the former segment are especially large. 

 But owing to the hard-coagulated blood in the wall of the gut 

 and blood-vessels the sections were somewhat torn, and I was 

 unable to trace the matter further. 



The Alimentary Tract. — There is a short thick-walled gizzard 

 in segment 6, concealed by the muscles of the pharynx. The 

 oesophagus is dilated in segments 12 and 13, but no definite glands 

 are formed. The intestine commences in the 15th segment, where 

 the thick wall of the oesophagus is replaced by a thin wall. The 

 typhlosole is a very low ridge. 



Reproductive Organs. — There are two pairs of testes in seg- 

 ments 9 and 10. The three pairs of sperm-sacs are in segments 

 8, 10, and 11. The first is small and attached to the hinder 

 septum ; the others larger and attached to the anterior septa 

 of their segments. All are " botryoidal " and contain developing 

 spermatozoa. The spermiducal gland on each side is very long, 



