260 Transactions. — Zoology. 



The largest specimen measures, in spirit, 20mm. in length 

 by 7mm. in breadth. Another specimen measures, in spirit, 

 15mm. by 5mm., while in life when crawling it measured 

 about 34mm. by 3mm. 



The peripharyngeal aperture, in spirit, is situated slightly 

 in front of the junction of the middle and posterior thirds of 

 the body, and the genital aperture is about half-way between 

 it and the posterior end. 



The eyes are very distinct, but arranged only in single 

 series, or approximately so, around the anterior margin, and 

 continued sparingly backwards along the lateral margins. 



Dorsal surface in life brownish-yellow minutely speckled 

 with warm brown, with paler narrow margins and a very 

 narrow, ill-defined, pale median line. Ventral surface nearly 

 white, faintly and minutely speckled with pale brown, except 

 at the anterior end. Anterior tip very pale yellow or brownish 

 yellow. 



This remarkable species is certainly nearly related to 

 Geoi^lana latissivia, described in Part II. of these notes, from 

 Springburn, but is distinguished by the narrower body, the 

 more pronounced hood, and especially the colour markings ; 

 perhaps also by the absence of the median notch in the pos- 

 terior margin. 



I collected six specimens near Lake Mahinapua, under 

 fallen logs. 



Geoplana graffii var. occidentalis, nov. 



Body at rest flattened above and below, tapering gradually 

 in front, more suddenly behind. Dorsal surface with a narrow 

 median stripe of dull oi-ange or buff, very minutely speckled 

 with brown, or even with a median very narrow brown line 

 almost defined in the middle of the orange. The orange band 

 is followed on each side by a broad band of dark-purplish 

 tint thickly dusted with minute specks of bluish lustre, and 

 first fading and then intensified on its outer edge to form 

 a narrow band of nearly black colour, followed by the pale 

 grey or buff margin of the body speckled minutely with 

 dai'ker grey or brown. Anterior tip brownish red. Ventral 

 surface light brown, sometimes with an ill-defined lighter 

 median band, and minutely speckled all over with darker 

 brown. Size of average specimen about 53mm. by 4mm. 

 when crawling, and 36mm. by 6mm. in spirit ; genital aperture 

 11mm. and peripharyngeal aperture 16ram. from the posterior 

 end in the same specimen in spirit. 



This western variety is distinguished from the eastern 

 types of the species by its larger average size, more speckled 

 character, and more strongly developed dark band above the 

 light marginal band. Though difficult to express in writing,. 



