206 PROF. W. B. BEXHAM OX AQUATIC [Nov. 3, 



Analysis of the Oligochcete Fauna of each of the Lakes. 



Lake Wakatipu, South Island. 



Greatest depth, 1242 feet. 



Number of stations at which worms wei'e obtained, 10. 



Total nvxmber of specimens, 37. 



The commonest worm appears to be Plutellus lacustris, which 

 was obtained from 7 stations at different parts of the lake, so that 

 it is evidently widespread throughout ; but it appears to be 

 limited to this lake, as none were obtained elsewhere. 



Phreodrilus lacustris also occurred at three stations, and appears 

 to be somewhat less widely distributed, though living at the same 

 depth. Haplotaxis heterogyne was obtained only at one station, 

 and a single undetermined immature specimen of Livinodrilns. 



Lake Manapouri, South Island. 



Greatest depth, 1458 feet. 



Number of stations, 6. 



Number of sjjecimens, 16. 



This, the deepest lake, so far as this sui'vey is concerned, 

 contained a greater variety of Oligochaetes than any of the other 

 lakes, for it yielded 6 genera. 



Phreodrilus lacustris and Taupodrilus simplex account for 

 twelve out of the sixteen specimens ; the former was obtained once 

 only, the latter at two stations. At two other stations Diporo- 

 chceta aquatica and at another Achmta nnaorica wei'e captured, 

 while an immature Limnodrilus completed the list. 



Lake Taupo, North Island. 



Greatest depth, 534 feet. 



Number of stations, 4. 



Total number of specimens, 32. 



Taupodrilus simplex and Limuodrilus lucasi account for more 

 than two-thirds of the total, the former occurring in two hauls, the 

 latter in one only. With the former, Phreodrilus mauianus was 

 obtained, while at another spot Enchytrceus shnulans occurred, and 

 an undetermined species of Tubifex completes the list. 



Lake Rotoiti, North Island. 



Greatest depth, 228 feet. 



Number of stations, 2. 



Number of specimens, many. 



This lake is characterised by Limnodrilus lucasi, of which 3 or 

 4 dozen were obtained at one spot ; while at the other station 

 immature specimens of Tubifex occurred. 



Lake Waikaremoana, North Island. 

 Greatest depth, 846 feet. 

 Number of stations, 3. 

 Number of specimens, 16. 

 Unfortunately these Avere very poorly preserved, inucli broken 



