276 Transactions. — Zoology. 



A. In line with chaeta a : A pair of small tubercles on 

 17 and 19, near the anterior margin, and mediad of the poro- 

 phores ; a pair of similar tubercles on the 18th, near the 

 hinder margin. 



B. In line with chaeta b : A pair of larger tubercles on 

 segment 20, around chaeta b (and, in one case, also on the 

 21st segment) ; a pair of similar tubercles on the 16th seg- 

 ment ; and a pair on the 10th segment. 



The spermathecal pores in the usual position, in line with 

 chaeta b. The nephridiopores in line with chaeta c. 



Dorsal pores are present, at any rate, behind the clitellunu 



Internal Anatomy. 



The dorsal vessel is single ; the last heart is in the 

 12th segment. 



Alimentary System. — There is no gizzard perceptible on 

 dissection. The oesophagus bears two pairs of distinct glands, 

 in segments 13 and 14 respectively. The intestine commences 

 in the 16th segment, and is without a typhlosole. 



Reproductive System. — ■ The testes, sperm-ducts, ovaries, 

 and oviducts occupy the usual positions. There are two 

 pairs of botryoidal sperm-sacs, in the 11th and 12th seg- 

 ments. The spermiducal glands are long, folded, and tubular, 

 but apparently of rather looser texture than is usual in 

 Acanthodrilids. Each is provided with a narrow and long 

 muscular duct, which is distinctly swollen where it penetrates 

 the body-wall. Each gland passes through four to six seg- 

 ments, and even the duct passes backwards into the segment 

 following the pore. 



Penial chaetae are present. Each sac contains a couple, a 

 longer and shorter, of functional chaetae, together with their 

 replacers. Both have the same general form. The tip is 

 somewhat spoon-shaped, while the shaft is ornamented by 

 numerous fine transverse and serrated ridges. 



The spermathecae are in the usual segments. Each is a 

 globular sac, with distinct narrow duct about half as long as 

 the sac itself. This duct receives, as it passes through the 

 body-wall, two sausage-shaped diverticula, which thus seem to 

 be independent of the sac. 



Remarks. 



This worm differs from N. macquariensis , F.E.B., in 

 several respects, as a comparison with the account* published 



* "On some Earthworms from the Islands around New Zealand" 

 (Trans. N.Z. Inst., xxxiii , p. 132). In that article I stated that the 

 penial chsetse are " hooked " at the tip. This I now find, from observation 

 of several specimens, to have been an accidental bending of the soft tip. 

 The hook exists in the preparation I then made, but I have not observed 

 it in other cases. 



