256 Transactions. — Zoology. 



Bathymetrical Distribution of the Mollusca — ctd. 



Summary. 



The Mollusca collected by Messrs. Lucas and Hodgkin in the 

 six lakes of New Zealand belong to nine genera, and these are 

 represented by twelve species and five subspecies. As new we 

 find one subspecies of Diplodon menziesi, one species of Corneo- 

 cyclas, and one species of Gundlachia. An interesting addition 

 to our fauna is Diplodonta lessoni, Kuster. 



From Lake Rotoiti no specimens of Potamopyrgus badia, 

 Gould, and Melanopsis trifasciata, Gray, were obtained, but it is 

 almost certain that Potamopyrgus corolla, subsp. salleana, was 

 taken for P. badia, and I never have seen an example of Melanop- 

 sis trifasciata from Lake Rotoiti, though I tried hard to get some. 

 In the Lake of Tiberiade, in Palestine, Mrlattopsis has been 

 found at a depth of about 150 ft. 



