Adams. — Land Mollusca of the Thames Goldfielda. 179 



such as Psyra i^lmiulata, Phriivgnathus eiiffone, Patula bucmiella, 

 Therasia celinde, and Amphidoxa chiron. 



The handsome hairy shell, Thalassia portia, is very local, and 

 though four or five may be found in one place, the vicinity may 

 be searched in vain for any more. 



Many laud-shells are found under the bark of dead trees, 

 especially in damp places. The rimu {Dacrydium ciq^ressinum) is 

 best for several kinds of Patula, and under the loose bark of the 

 taua {Beelschmeidia taua), PhrLv<j)iathus conella, Elaa jeffreysiana 

 and Endodonta pcecilosticta are not uncommon. 



On cushions of moss growing on dead trees, or on patches 

 of Hymenophyllum, Endodonta lehiionias can be found, but this 

 minute shell is very inconspicuous. 



The fleshy tubers of Earina aiitumnalis may harbour Oto- 

 concha dimidiata ; but this shell is more likely to be found under 

 the outer decaying fronds of the nikau [Areca sayida) in damp 

 situations. 



The eggs of land-shells are found chiefly under the fronds 

 of the nikau, or within the leaves of kiekie or of Astelia 

 solandri. That the land mollusca and their eggs have many 

 enemies, appears evident to me, but to write on this subject 

 would require much closer observation than I have been able 

 to devote to it. 



Freshwateb Mollusca. 



The freshwater mollusca are represented in every stream 

 and in every swamp, and though very plentiful, there are very 

 few species. In the Kaueranga Eiver, about half a mile fr'om 

 its mouth, there is an abundance of a Mytilus which resembles 

 M. ater, but it may be a new species. In the upper course, 

 Melanopsis bifasciata is not uncommon on pieces of dead wood, 

 and some tributary rivulets abound in Potamopyrgus corolla. 



Planorhis corinna, and Pisidium neozelanica, appear to occur 

 in only one place, but they are both inconspicuous and easily 

 overlooked. The one is found on Azolla rubra, and the other 

 on the muddy bottom at the roots of Cyperus ustulatas. I 

 append a list of the Mollusca found in the district, which may 

 probably be increased by the addition of a few more species. 



Catalogue of the Land and Freshwater Mollusca observed 

 IN THE Thames District. 



I.— LAND MOLLUSCA. 



1. Carthcea kivi. Gray. On leaves of nikau, kiekie, and kawa- 



kawa. 



2. Tornatellina neozelanica, Pfeiffer. On fronds of ferns. 



