696 PEOF. ARTHUR DENDY ON 



nnd less distinct than the median stripe. Then comes a much 

 bi'oadei" band of finely mottled grey, bounded on the outside by 

 another very narrow yellow stripe (the outer paired stripe). The 

 outer paired stripe is much more distinct than the inner one and 

 is accentuated by the presence of a very narrow, almost black 

 edging to the broad band of dark grey, finely mottled ground- 

 colour which lies outside it and extends to the ventro-lateral 

 margin of the body. 



The characteristic feature of the pattern seems to be the 

 presence of five very narrow, pale yellow stripes on a dark 

 ba,ckground of finely mottled grey, the interval between the 

 median stripe and the inner paired stripe being considerably 

 less than that between the two paired stripes. In the specimen 

 described above the inner paired stripe is almost obsolete, while 

 the outer one is quite clearly defined ; in the other specimen botli 

 paired stripes are equally strongly developed, but neither of them 

 is nearly so distinct as the median stripe, and the outer one has 

 only a feebly developed dark edging on the outside. 



This species seems to be closely related to Steel's Geoplana 

 fusco-dorsalis [1901], also found near Perth. 



I have only two specimens, both of which were obtained in 

 the neighbourhood of the Mundaring Weir. 



Geoplana comitatis sp. n. 



Body in life comparatively short and broad. Dorsal svirface in 

 life pale dusky yellow, with olive-brown stripe and mottling ; 

 ventral surface white or grey, without markings ; anterior tip 

 pink. 



The arrangement of the pattern on the dorsal surface is as 

 follows : — There is a narrow median dai-k stripe. The interval 

 between this and the margin of the body is divided into three 

 bands of about equal width, viz., an inner band of clear ground- 

 colour, an outer band of clear ground-colour, and an ill-defined 

 intermediate zone in which the ground-colour is thickly sprinkled 

 with minute dark specks. 



The eyes are arranged as usual. The peripharyngeal aperture 

 is situated about the middle of the body and the genital apertui'e 

 somewhat nearer to it than to the posterior end. There is, 

 however, a good deal of variation in this respect, depending upon 

 the state of contraction. 



The body in spirit is rather short and thick, averaging about 

 25 mm. in length by 4 mm. in width in the middle ; it is approxi- 

 mately oval in transverse section, with no trace of marginal 

 ridges. 



This species bears a strong resemblance to Oeoplana tasmaniana 

 Darwin, but may be distinguished by the following features. 

 Although there is one pair of ill-defined, broad dorsal bands of 

 brown mottling, very much as in G. tasmaiiiana, there never 

 appears to be a marginal (or submarginal) mottling or stripe. 

 The general colour of the dorsal surface in spirit specimens is 



