370 PROCEEDINGS OF THE MALACOLOGICAL SOCIETr. 



of this species, to what can it owe its extinction ? As before quoted, 

 Dr. Graeffe termed it "numerous", and I find Macgillivray collected 

 it. There is not the least probability that either of these obtained it 

 from the colony I liave denoted, whicli was the south-west aspect of 

 the highest peak of the island. 



In the spring of the year, under stones on the level, another Para- 

 laoma was obtained, to whicli I attach the designation ambigua. Fair 

 numbers were collected, and it gave rise to much disquietude on my 

 part. After nine months searching, to note a new shell on the well- 

 looked over level was unexpected, while the discovery that Ilelicnrion 

 Kermadecensis was confined to a very small patch, and Tornatellina 

 inconspicua to an even more restricted area, caused me much misgiving. 

 I had anticipated I should be able to confidently state I had collected 

 all the land molluscs of Sunday Island, but such facts as these destroyed 

 my complacency. Ilenewed efforts were made, and other parts of tlie 

 island explored, with no further results. Consequently, though I hope 

 I have made known the whole of the non-marine molluscan fauna, 

 I feel I can make no justifiable claim to have done so. A strange 

 mollusc must here be dealt witli. Shells were dredged in various 

 depths, np to 25 fathoms, which I immediately recognized as non- 

 marine though of Ilissoid appearance. Later, ]\rr. W. L. Wallace 

 discovered them alive crawling over wet moss on the sea-cliff of Dayrell 

 Island, one of the outlying islets. Tlien Mr. W. R. Brook Oliver 

 discovered them on the mainland in a similar situation. I searched 

 very closely, but only found a few well hidden in crevices where 

 water trickled down after heavy rain. From their occurrence in 

 dredgings they would have been collected numerously had their station 

 been discovered. From shell characters they would be referable to 

 Assiminea, but they are inoperculate. Upon examining the Lifu 

 marine Molluscain the Manchester Museum, I recognized my puzzling 

 shell in the type of Barleeia chrysomela, Melv. & Standen. This species 

 was described from dead specimens found among shells and collected 

 at Lifu, and the ty[)e has the mouth badly broken. I cannot discern 

 the least difference between the Lifu shells and my own, but Barleeia 

 is a very bad selection for generic location. 



It seems of interest to note the great distinction between the 

 tree-dwelling species and those found upon the gTound. Owing 

 to falling leaves, some of the former were occasionally noted on 

 the ground, but none of the ground-livers were ever noticed to occur 

 on trees. 



The tree-dwelling molluscs were — 



Helicarion Kermadecensis (Smith). 



PtychodoH Royaniis, Iredale. 



Calyiiina arhoricola, Iredale. 



Flammulina miserahilis, Iredale. 



Charopa pseudanyuicula, Iredale. 



Pronesopupa senex, Iredale. 



Tornatellina sp., a slender form. 



T. sp,, near bilamellata, Anton. 



Masmias inconspicua (Brazier). 



