138 THE PBOCEEDINGS OF THE LINNEAN SOCIETY 



species. The diflferences are the color, the double angle on the 

 whorls above and below the flattened portion ; but I do not deny 

 that they may be only varieties of one type of which P. tahulata 

 is the extreme. 



Physa guyonensis, n. s. Plate 13, fig. 4 



P. t. suhumhilicata, ovata, ienue striata lineis incrementi tantum, 

 parum nitente, opaca, superne corrosa, luteo-cornea vel olwacea, 

 plus mimcsve sordide atro nehulosa ; anfr. J/., valde declivibus, 

 rapide decrescentibus, ultimo valde superanti, medio late ylanato, 

 2 carinis ohsoletis insignito ; spira hrevi, acuta ; apertura late 

 ovata. Peristoma acutum rotundatum, Lahio refiexo, columella 

 crassiuscula. Long. 13, lat. 7J long, apert 9, lat. 5, long, spire 4. 



Lake Guyon, 'New Zealand. 



Shell subumbilicate, ovate, slightly striate with the lines of 

 growth only, somewhat shining, opaque, corroded above, 

 yellowish horn or olive, more or less sordidly clouded with 

 black ; four whorls rapidly decreasing and very much sloping ; 

 last much larger than the rest, and broadly flattened in the 

 middle, with two obsolete keels in the midst, short, acute, 

 aperture broadly ovate. Peristome acute, rounded, lip reflected, 

 columella rather thick. 



This species seems especially distinguished by the short spire, 

 the sloping form, the flattened last whorl which has a faintly 

 rounded keel above and below it. The thickening of the 

 columella and the subumbilication are also peculiar. It is an 

 approach to some of the North Australian forms, but not very 



near, and there is no congener like it in Southern Australia or 

 Tasmania. 



Physa lirata, n. s. Plate 13, fig. 6. 

 P.t. parua, imperforata, elongaio-ovata, suh-diaphana, luteo-cornea^ 

 periostraca fuliginosa plus minusve induta ; anfr. 4, declivibus, spi- 

 raliter punctatis regulariter liratis, superne conspicue carinatis, lineis 

 incrementi confertis, tenuissimis ; spira eu^serta, acuta ; apertura 

 elliplica, peristomate acuto, tenuissimo, labio contorto, haud reflexo, 

 exacte definito, antice valde producto. Long. 9 1^, lat. 5, long, apert. 

 5, lat. 3, long spire 3, millim. Taireri River. Capt. F. W. 

 Hutton. 



