Hutton. — On some Freshwater Shells of New Zealand. 57 



Bulinus tabulatus, Gould, U.S. Explo. Expedition, xii., p. 116, f. 130 

 (1848) ; Sow. Conch. Icon., Physa, f. 17. 



Hah. Bay of Islands in mountain streams. Whorls flattened above, 

 but the angle rounded. I have not seen this species, unless it is the same 

 as the last. The dentition is unknown. 



Bulinus jvlesta, Adams, Pro. Zool. Soc, 1861, p. 144; Sowb. Conch. 

 Icon., Physa, f. 32. Physa lirata, Tenison-Woods, Pro. Lin. Soc. of 

 N.S.W., hi., p. 138, pi. 13, f. 6 (1878), not of Tristram. 



Hab. Throughout New Zealand. 



Distinguished by the angular shoulder to the shell. 



Dentition, 30-1-30, of which 6 or 8 are laterals. PI. xii., f. 12. 



Central tooth broader behind, the length about the same as the breadth ; 

 reflected portion covering more than half the base, and carrying two small 

 cutting points. Inner laterals with three moderately large cutting points, 

 the inner one of which is bidenticulate at the point ; outer laterals with 

 the inner cutting point broad and with three denticles at the apex. 

 Marginals normal. 



Planoebis corinna, Gray (1849). PI. xii., fig. 6. Eeeve, Conch. Icon., 

 Planorbis, f. 122. 



Hab. Auckland, Christchurch, Lake Wakatipu. 



Animal semitransparent ; greyish, minutely speckled with smoke brown. 

 Foot short, tapering posteriorly, rounded behind and in front. Bostrum 

 emarginate. Tentacles cylindrical, rounded at the tip, widely separated at 

 the base. Eyes large, round, situated at the inner bases of the tentacles. 



The teeth are arranged in broken transverse bands, but they are too 

 minute to be made out with a j^tli objective. There appear to be eleven 

 laterals and a large number of marginals on each side, the difference 

 between the two being well marked. 



The following species has been introduced :— 

 Limn-ea stagnalis, Linne. 

 Hab. Biver Avon, Christchurch. 

 Introduced intentionally as food for trout. 



The following are omitted as not really inhabiting New Zealand : — 



Limnaa witeoni, Tryon (1866). 



Like Physa pyramidata, Sowb., from Australia. 



Physa gibbosa, Gould (1847). 



Inhabits New South Wales. 



Physa cumingi, Adams (1861). 



Inhabits Queensland, 



