Gillies. — On New Zealand Mollusca. 169 



Genus Unio. 



Unio waikakense. Shell, oblong, or oblong-ovate, concentrically and 

 irregularly sulcated, sub-diaphanous, inflated ; anterior side produced, 

 obtuse, slightly compressed ; posterior slope, keeled, sharp : base, slightly 

 depressed ; umbunes, decorticated, flattish, much worn ; primary tooth, large 

 crested; epidermis, strong, overlapping at margin, wrinkled on anterior 

 slope ; colour, brownish-yellow on posterior side, shading into dusky-green 

 on the anterior, with alternate light- coloured lateral stripes ; 3^ inches 

 broad, 2J inches long. 



Hab. Waikare Lake, mountains, interior of the North Island of New 

 Zealand. 



The largest and handsomest of all the known New Zealand species of 

 the genus. 



Art XXIII. — Notes on New Zealand Mollusca. 



By Mr. Justice Gillies, Auckland. 

 [Read before the Auckland Institute, 11th July, 1881.] 

 During my recent trip to England I took with me the late Dr. Sinclair's 

 collection of New Zealand shells, mostly collected in the North Island, and 

 had them named according to the specimens in the British Museum by the 

 aid of Mr. G. B. Sowerby, junr., and Mr. E. A. Smith, of the British Museum, 

 to both of whom my best thanks are due for their kindness. On my return to 

 the colony I have compared these with Professor Hutton's type specimens, 

 in the Colonial Museum, Wellington, and in the Dunedin Museum. The 

 following is the result of my researches, which may probably prove useful 

 to those interested in New Zealand conchology. The pages given refer to 

 the new edition of the " Catalogue of New Zealand Mollusca,'" by Professor 

 Button ; Wellington, 1880. 



PAGE 



16. Helix reinga — Doubtful if ever found in New Zealand. 



41. Conus apliistre — Add to catalogue. I have a single specimen 



from the Bay of Islands, but it is doubtful whether either this 

 or Conus zealandicus really belong to New Zealand. They 

 may have been dropped from some South Sea whaler, of 

 which many visit the Bay of Islands. 



42. Acus Jdrki is Terebra tristis of Deshayes and T. antarctica of 



Smith. 

 14 



