Benham. — The Oligochaeta of the New Zealand Lakes. 197 

 Table showing Fauna op the Lakes explored — contimted. 



Species. 



Number 



of 



Individuals. 



Depths, 



in 



Feet. 



Number 



of 

 Stations. 



RoTOiTi: Maximum depth, 228 ft.; number of stations, 2; number of 



specimens, many. 



Limnodrilus lucasi .. .. I Numerous \ 100-228 i 1 



Tubifex, sp. inc. . . . . . . i 2 . . : 1 



Waikare : Maximum depth, Oft. ; number of stations, 1. 



Limnodrilus vejdovskyanus . . 1 30 j 9 I 1 



Taupodrilus simplex . . . . I 1 I 9 | 1 



Waikaremoana : Maximum depth, 8-46 ft. ; number of stations, 3 ; num- 

 ber of specimens, 16. 



Limnodrilus ve]"dovskyanus(?) 

 Limnodrilus, sp. inc. 

 Tubifex, sp. inc. . . 

 Indeterminable fragments . . 



6 

 1 

 1 



8 



800-840 

 200-750 



80 



Eemaeks on the above Table. 



Lake Wakatipu thus yielded, in eleven hauls at different 

 stations, a total of thirty specimens, which fall into four 

 species, belonging to as many genera, and representing four 

 families. Of these Limnodrilus was represented by a single 

 immature individual. But the commonest species is Platellus 

 lacustris, which was obtained at eight stations widely sepa- 

 rated and at depths varying from 300 ft. to 1,200 ft. It 

 occurs both in the North Arm and in the South Arm of the 

 lake. Phreodrilus was obtained at only three stations in the 

 South Arm, in depths from 300 ft. to 1,000 ft. 



Lake Manapouri, whose greatest depth Mr. Lucas found to 

 be 1,458 ft., yielded sixteen specimens for six hauls. These 

 fall into five species, belonging to as many genera, and repre- 

 senting four faiiiilies. But here again a single specimen of 

 Limnodrilus too immature for identification is included. It 

 is possible that the hauls were made in depths beyond that 

 at which the members of this genus dwell, for they are more 

 numerously represented in the shallower lakes of the North 

 Island. The remaining worms, however, are very interesting 

 — firstly, the small worm Achceta maorica, represented, unfor- 

 tunately, by only a single individual, is the fourth species of 

 the genus, and has hitherto only been known in Europe. 

 Then, the new genus Taupodrilus occurs at two stations, 

 ranging from 10 ft. to 1,000 ft. in depth — the only species 

 which is common to the lakes of the two Islands. Phreodrilus 

 is represented by the same species as in Wakatipu. And, 

 finally, Diporochceta aquatica, the first member of the genus 



