442 On the Land-Mollusca of Tasmania and New Zealand. 



L. — Note on the lielati'on of the Land-Mollusca of 

 Tasmania and of Neiv Zealand. By C IIedley, F.L.IS. 



The number of this ]\ragazine for January last contained an 

 article in wliicli my friend Mr. Suter discusses the relation 

 between [inter alia) the snails of New Zealand and of Tas- 

 mania, eoncludinj^ that they are closely allied. Vv'^hile 

 assenting to the statements made in the body of the j)aper, 

 from this deduction I must differ. 



We are told that Pihytida^ Rhenea, Paryphanta^ Laoma, 

 Flammidinaj and Endodonta are common to either fauna. 

 To these may be added JJelicarion ; and the interesting fossil 

 Bh/tida Simsoniana, Johnston (Proc. Koy. Soc. Tasmania, 

 1880, p. 24), a near ally of R. Dunnia;, Gray, may be 

 quoted to reinforce the argument. 



]5ut to grasp the situation the whole fauna must be 

 reviewed ; and in doing so we find that, on the one hand, 

 Tasmania contains, besides the above genera, Liparus, 

 Caryodes, Anoy/ypta, Cystopelta, Pupa, and Succlnea, while, 

 on the other. New Zealand possesses Placostylus, Schizo- 

 fflossa, OtocoJicha, Torjiatellina, AthoracopJiorus, and the 

 opcrculates Lagocheilus, Reah'a, and Hydrocena. 



The fact that Tasmania possesses no real land-operculates, 

 the Truncatella included in Tasmanian lists being more a 

 marine than a terrestrial animal, alone constitutes a profound 

 gulf between the faunas. The widespread Succinea and 

 Pupa have reached Tasmania from a source that did not 

 communicate with New Zealand, while the reverse is true of 

 TornatelUna. 



Examining the common element we note that this includes 

 about half the genera of each country, that all tliese range 

 beyond, and some far beyond, the two countries, and tiiat 

 this element is chiefly composed of the smallest shells. Of 

 all, Paryphanta has the most limited range, extending to 

 Victoria {atravientaria) ; this genus is, however, vaguely 

 defined, and its characters require a definition wliich may 

 alter the supposed geogra))hical range : Rhenea extends to 

 Queensland [splendidula) and to New Caledonia {hifcolina) ; 

 Rhytida to liritish New Guinea [glohosa) and to the Solomons 

 []'il/andrei) ; Laonia to South Australia [pictilis] ; Flammu- 

 Una, or something very like it, is shown by Mr. Suter to 

 reach Africa {Pel/a Burnuj)i) ; Endodonta ranges to the 

 Philippines and to the Society Islands, and Jlvlicarion 

 through j\lalaysia and India to Africa. 



