. Transactions and proceedings of the New Zealand Institute . ncatula, but is, I think, quite distinct; and this is also the opinion ofProfessor A. P. Thomas, to whom I showed the specimens before venturingto describe them. Bulinus antipodeus, Sowerby in Eeeves 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 allied to P. auriculata, Gassies, from New Caledonia. Bulinus variabilis, Gray in Dieffenbachs New Zealand, ii., p. 248(1843). Bulinus gibbosus, Hutton, Trans.

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. Transactions and proceedings of the New Zealand Institute . ncatula, but is, I think, quite distinct; and this is also the opinion ofProfessor A. P. Thomas, to whom I showed the specimens before venturingto describe them. Bulinus antipodeus, Sowerby in Eeeves 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 allied to P. auriculata, Gassies, from New Caledonia. Bulinus variabilis, Gray in Dieffenbachs New Zealand, ii., p. 248(1843). Bulinus gibbosus, Hutton, Trans. Inst., xiv., p. 155, pi. iv., , q. and v. (not of Gould). Physa nova-zealandia, Sowb. Conch. Icon.,f. 29 (1884). Physa guyonensis, Tenison-Woods, Pro. Lin. Soc. , hi., p. 138, pi. 13, f. 4. (1878). Hab. Throughout New Zealand. This species is smaller than the last. The whorls are rounded, butsometimes show traces of a keel. The shell is figured in pi. xii., f. 7, thedentition in Trans. Inst., vol. xiv., pi. 4, ,

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