[TRANSACTIONS OF THE NEW ZEALAND INSTITUTE, 
| VOL. XXVI.| 
3020200000000 

Art. VIII.—Further Contributions to the Knowledge of the 
Molluscan Fauna of New Zealand, with Descriptions of 
Eight new Species. 
By Henry Suter. 
Communicated by Professor Hutton. 
[Read before the Philosophical Institute of Canterbury, 1st November, 
1893. | 
Plates XIV.-XXI. 
1. Large Form of Potamopyrgus cumingiana, Fischer. 
Very large specimens of this shell were kindly presented to 
me by Professor F. W. Hutton. They were collected in Lake 
Te Anau, and are 8mm. high by 4mm. diameter. The 
whorls, of which there are eight, are very strongly and 
broadly angled round the upper part, and the last three show 
traces of the rubbed-off spines, of which there were about 
sixteen on the body-whorl. 
This species is very limited in its distribution on the South 
Island. Ihave much smaller specimens from Pelorus River 
and Collingwood only. 
2. Latia and its Varieties. 
Four species of this genus peculiar to New Zealand 
have been described—viz., L. neritoides, Gray (1849); WL. 
lateralis, Gould (1852); L. petitiana, Fischer (1856); and 
L. gassiesiana, Fischer (1856). Mr. Charles Hedley kindly 
presented me with etchings of these shells, and I am there- 
fore now in a better position to judge whether they are all 
good species or only varieties of L. neritoides, Gray, the first 
described of the lot. Gould himself says that his L. laterals 
might probably be the same as L. neritoides, and Professor 
Hutton (Proc. Linn. Soc. N.S.W., vol. vii., 1883) holds that 
these two form only one species. To judge, however, irom the 
figures, I am of opinion that L. lateralis and L. gassvesiana 
must be considered as varieties of L. neritoides, and very 
likely also L. petitiana, though the figure does not show a 
very marked difference from L. neritoides. 
8. Ancylus dohrnianus, Clessin (1882). od qlee 
The description and figures of this shell, which is said to 
come from New Zealand, were published in Conch. Cab. (2), 
Bd. I., Abth. vi., p. 54; pl. vili., fig. 8 (two). It resembles 
somewhat A. irvine, Petterd, from Tasmania, but the apex 1s 
quite different. Neither Professor Hutton nor myself have 
any knowledge of such an Ancylus ever having been found in 
