Iked ale. — Mollusca of the Kermadecs and Norfolk Island. 501 



Phillip Esland Records. 



Belloconcha phillipii (Gray). Advena catnpbe Hi campbellii (Gray). 

 grayi (Sykes). Quintalia stoddarti stoddarti (Gray). 



I N D BT ERM I N ATE K ECORDS. 



Charopa exagitans (Cox). Charopa ? quintali (Cox). 

 — ? depsta (Cox). ? patescens (Cox). 



Introduced Species Living ox .Main Island and Nepeax Island. 

 Vallonia excentrica Sterki (recorded by Sykes as V. pulchella). 



As a key to Sykes's records the following generic identities must be 

 carefully noted : — 



Microcystis Sykes = Greenwoodo- Charopa — intermediate spp. 



concha. Endodonta = A 1 ' orfolcioconcha . 



Trochonanina = Roybellia. Succinea = Succinea. 



Fretum = Belloconcha . Vertigo = Nesopupa. 



Rotula = Advena. Ompkalotrojris = Otnphalotropis. 



Medyla = Fanvlum. Diplommatina = Palaina. 



Sitala = Sitala. Paludestrina = " Paludestrina." 

 Carthaea = Quintalia. 



I have had the pleasure of critically examining the whole of the material 

 Mr. Roy Bell collected, and I here propose to discuss the affinities of the 

 molluscs. 



Like my own Kermadec list, the Norfolk Island list abounds in new 

 generic names, and it is remarkable how extraordinary the difference is 

 between the two lists : in the former " Endodonts " predominate, in the 

 latter they are almost a negligible feature. Zonitoids practically do not 

 exist in New Zealand ; two species occurred at the Kermadecs, while they 

 are omnipresent in the Norfolk Island fauna. 



IV. Digest of the Kermadec Land Mollusca. 



A digest of my Kermadec collection must be first made, then a similar 

 one of the Norfolk Island one, and the results compared. Thus, at the 

 Kermadecs the largest snail-shell was that of Helicarion kermadecensis 

 (Smith). As the animal in that genus is large, it was obviously the largest 

 snail. It only occurred to me in one patch at the highest point of the 

 island, though both to Macgillivray and Graeffe it appeared commonly. 

 The shell agrees quite closely in character with that of H. cuvieri (Ferussac), 

 the Australian shell, which is the type of the genus, and the generic location 

 seems correct. This is mentioned as the genus-name. Helicarion has been 

 used to include any glassy, loosely coiled shell, and these have been recent! y 

 found to cover many diverse genera of snails. I do not admit the occur- 

 rence of Helicarion kermadecensis (Smith) at Hobson's Glen, Auckland, as 

 there are too many doubtful factors in this record. It would therefore 

 appear that Helicarion. kermadecensis (Smith) arrived at the Kermadecs 

 from the north. It was the only member of the family Helicarionidae which 

 I consider absent otherwise from the New Zealand zoological region. 



The next two largest species are referable to the family Zonitidae, as 

 used at the presenl time. Tins is a wide group, and future .systematic work 



o 



