192 Transactions. — Zoology. 



EXPLANATION OF PLATE VIII. 



Fig. 1. Outline of Hirudo antipodiwi (x 2) taken from a small specimen^ 

 which was not curved. (It appears desirable to insert this 

 figure, as so few people in New Zealand seem to know a 

 "leech"; the land-planarian is commonly referred to by this 

 name.) 



„ 2. View of the dorsal surface of the head (enlarged), showing the 

 arrangement of eyes and sensillse and pigmentation. 



„ 3. View of a short portion of another individual, dorsal surface, in 

 which the median black band is broken up into three narrow 

 streaks. ( x 2.) 



„ 4. Under-surface of the head; a, b, the peculiar fleshy lips. (En- 

 larged.) 



„ 5. The same, still more magnified, after a median incision through 

 the body-wall and ventral lip has been made ; the lips are turned 

 aside so as to expose the three jaws (j). m, the muscles thereof. 



„ 6. One of the jaws (camera, Oct. 1, obj. 3, Leitz), showing the 

 feeble development of the denticular ridges. 



„ 7. A cocoon (enlarged), the surface only partly filled in. In the 

 middle is seen the external surface of the basal membrane ; and, 

 marginally, the felt-work. A, shows a piece of the surface, still 

 more enlarged. B, the cut edge of the wall, showing the rela- 

 tion of the felt-work to the basal membrane. 



Aet. XXII. — A Note on the Oligochaeta of the Neiu Zealand 



Lakes. 



By W. B. Benham, D.Sc, M.A., F.Z.S., Professor of 

 Biology in the University of Otago. 



[Read before the' Otago Institute, 11th Augicst, 1908.'] 

 During the year 1902 two young naturahsts from the Old 

 Country — Messrs. Keith Lucas and Hodson — visited this 

 colony for the purpose of making a biological and topo- 

 graphical survey of the principal lakes. Mr. Lucas was good 

 enough to hand over to me for identification all the Oligo- 

 chceta, or annelids, which were collected by him. Naturally, 

 I was delighted to have the opportunity of investigating the 

 character of the deep-water fauna of our lakes, especially as, 

 in the first place, such an opportunity is, in all probability, 

 not likely to recur for several years ; and, secondly, because 

 our knowledge of the fresh-water annelids of the colony can 

 be compressed into a very small compass. I propose to-night 

 to give merely a brief summary of my results, a full and illus- 

 trated account of which I have sent to the Zoological Society. 

 The material upon which this paper is based consisted of 

 thirty-three small tubes, containing about a hundred and 

 fifty specimens, which, after examination, I find represent 

 about a dozen species, all new to science, referable to nine 

 genera (of which one is new), belonging to five families. 



