56 Transactions, — Zoology. 



entire length of the shell ; peristome simple, the inner lip slightly reflexed, 

 not covering the umbilicus ; columella plait small. Length # 18 ; diameter 

 •07; aperture, long '07, broad -05 inch. 



Hab. Eiver Heathcote, Christchurch. 



Animal yellowish white, semi-transparent, the head between the eyes 

 and tbe centre of the rostrum yellowish brown. Foot emarginate in front ; 

 tentacles triangular, flattish, very short. Eyes triangular. 



Dentition 20-1-20, of which about 6 or 8 are laterals. PI. xii., fig. 11. 



Central tooth quadrate, the length more than twice the breadth ; 

 reflected portion about two-fifths of the base. Inner laterals with the 

 reflected portion deeply excavated on the outer side, bicuspid, the inner 

 cusp with its point being the larger; cutting points not reaching to the 

 posterior margin of the base. Outer laterals with the reflected portion not 

 excavated, the outer point small ; the inner large, projecting beyond the 

 base, often bidenticulate. Marginals normal. 



This species has the habit of leaving the water like L. truncatula, but 

 from that species it differs in the shell, in the animal, and in the dentition. 



LiMNiEA pucilla, sp. nov. PI. xii., fig. 5. 



Shell small, oblong, glossy, translucent, finely longitudinally striated. 

 Whorls 4, rounded, aperture oval, half the length of the shell ; peristome 

 simple, the inner lip reflexed, covering the umbilicus ; columellar plait 

 obsolete. Length -16; diameter -10; aperture '08 inch. 



Hab. Auckland. 



I have only seen two dead specimens of this species, and have not been 

 able to examine the dentition. The shell somewhat resembles that of 

 L. truncatula, but is, I think, quite distinct ; and this is also the opinion of 

 Professor A. P. Thomas, to whom I showed the specimens before venturing 

 to describe them. 



Bulinus antipodeus, Sowerby in Eeeve's Conch. Icon., Physa, f. 37 

 (1873). 



Hab. In lakes from Auckland to Otago. This is our largest species ; 

 the whorls are never keeled. The animal and dentition are unknown. 

 Apparently allied to P. auriculata, Gassies, from New Caledonia. 



Bulinus variabilis, Gray in Dieffenbach's New Zealand, ii., p. 248 

 (1843). Bulinus gibbosus, Hutton, Trans. N.Z. Inst., xiv., p. 155, pi. iv., f. 

 c, q. and v. (not of Gould). Physa nova-zealandia, Sowb. Conch. Icon., 

 f. 29 (1884). Physa guyonensis, Tenison- Woods, Pro. Lin. Soc. of 

 N.S.W., hi., p. 138, pi. 13, f. 4. (1878). 



Hab. Throughout New Zealand. 



This species is smaller than the last. The whorls are rounded, but 

 sometimes show traces of a keel. The shell is figured in pi. xii., f. 7, the 

 dentition in Trans. N.Z. Inst., vol. xiv., pi. 4, 



