Benham. — The Oligochaeta of the New Zealand Lakes. 193 



Family PHEEODRILID^. 



Phreodrilus, Beddard. 



1. P. lacustris, n. sp. Wakatipu and Manapouri. 



2. P. mauiensis, n. sp. Taupo. 



Family TUBIFICID^. 

 Taupodrilus, n. gen. 



3. T. simplex, n. sp. Taupo, Waikare, and Manapouri. 



Limnodrilus, Clapar^de. 



4. L. lucasi, n. sp. Taupo and Eotoiti. 



5. L vejdov sky amis, n. sp. Waikare and Waikaremoana. 



6. L. sp. incert. (immature). Wakatipu and Manapouri. 



Tubifex, Lamarck. 



7. T. sp. incert. (immature). Taupo, Eotoiti, and Waikare- 



moana. 



Family ENCHYTE^ID^. 

 Enchytraeus, Henle. 



8. E. sim^blans, n. sp. Taupo. 



Achseta, Vejdovsky. 



9. A. maorica, n. sp. Manapouri. 



Family HAPLOTAXID^. 

 Haplotaxis, Hoffmeister. 



10. H. heterogyne, n. sp. Wakatipu. 



Family MEGASCOLECID^. 

 Sub-family Megascolecin^. 

 Diporochseta, Beddard. 



11. D. aquatica, n. sp. Manapouri. 



Plutellus, Perrier. 



12. P. lacustris, n. sp. Wakatipu. 



All these worms are -of small size, none exceeding 3 in., 

 the majority but little more than 1 in. in length, while one 

 was only about -J- in. ; and the diameter of the majority does 

 not exceed the thickness of a stout pin. Hence the work of 

 identification was by no means an easy one, necessitating the 

 constant use of higher powers of the microscope, for the 

 external differences between these fresh - water worms lie 

 chiefly in the form and number of the small bristles with 

 which each segment of the body is provided, and these 



13— Trans. 



