796 UASTKOPODA. [Pulmonata. 



animal. ;S /;/*' grooves 12 on each side, some of them bifurcating, 6 

 or 7 are post-pallial. In well-preserved specimens the notum is finely 

 granular, and each lateral area contains 2 to 3 small roundish papillae, 

 which, however, are mostly inconspicuous. The triangular head-shield 

 is rather short, and does not quite reach to the middle between the 

 head and renal orifice. Mantle-area bounded on the left by the median 

 groove, in front by a lateral groove which curves backward for a short 

 distance and then runs down to the perinotum parallel to the other 

 lateral grooves ; posteriorly there is a simple oblique groove, so that 

 the mantle-area is quite open towards this side groove ; sometimes a 

 fine short transverse groove arises from the posterior groove, either 

 a,t its origin or a little further down, imperfectly and inconspicuously 

 closing t'ie mantle-area. The renal orifice is in the median groove in 

 front of the mantle-area, and in most specimens distinctly separated 

 from it by a groove. The pulmonary orifice is subcentral in the anterior 

 part of the mantle-area. The anus is below the renal orifice on the 

 right side, close to the perinotum, and the preanal groove is the same 

 that separates the renal opening from the mantle-area. Genital orifice 

 close to the right tentacle. Hyponotum fairly distinct, broad ; the peri- 

 notum usually not very conspicuous, consisting of a low of elongated 

 tubercles. The side grooves are continued over the hyponotum and 

 part of the aulacopod sole, the latter characters being the result of 

 contraction in alcohol. Sole separated from the head by a deep 

 groove, pointed behind. Tail rounded or tapering to a point. Twelve 

 to sixteen minute calcareous plates form the rudimentary shell. 



Measurements of a specimen from Dunedin : Length over back 

 from head to tip, 30mm. Width of back to perinotum, 15mm. 

 Sole Length, 23mm.; breadth, 4-5 mm. Breadth of hyponotum, 

 2 mm. Distance of anus from right tentacle, 6 mm. Distance of anus 

 from pulmonary orifice. 5J mm. Distance of pulmonary orifice from 

 head, 8 mm. 



Dimensions of a large specimen from Great Barrier Island : Length, 

 5 1 mm. ; width, 22 mm. 



Anatomy. Button, T.N.Z.I., xiv, ]<>, pi. 5, f. 3-9. 



Radula having the formula 130x255 + 1+255. Central tooth 

 emarginate above, rounded below, with 7 denticles. 



Reproductive organs without spermoviduct and prostate, but with 

 accessory bulbose and glomerate glands. The receptaculum seminis is 

 y.lobular, with a short neck, proximal. Male organ long, narrow, and 

 tapering, and the vas deferens enters it at its posterior extremity, 

 where the retractor muscle is also att;icl.od. The spermatozoa are 

 gradually thickened at one end, which is spirally twisted. 



Type in the Otago Museum, Dunedin. 



Hob. Dunedin ; Resolution Island ; Ashburton ; Great Barrier 

 Island; Mount Hut, Tongariro district, at 3,700ft. altitude (E. 

 Phillips Turner). 



