LAND-PLAXAKIAKS FROM WEST AUSTRALIA. 695 



arranged as follows : — There is a narrow median stripe of brown 

 and ou each side of it a band of clear yellow ground-colour of 

 about twice the width. This is followed by a band of brown, 

 less sharply defined than the median stripe and of about twice 

 the width. "VVe may call this the inner paired stripe ; it is 

 followed by a somewhat wider band of ground-colour mottled 

 with minute brown specks, and then conies an outer paired stripe 

 similar to the inner one. In life there is a fairly wide band of 

 clear ground-colour visible on the dorsal surface outside each 

 outer paired stripe, but in spii'it this tends to be turned in by 

 contraction, so that the outer paiied stripe comes to lie at the 

 margin of the dorsal surface. The degree of distinctness of 

 the paired stripes varies considerably, and they sometimes tend 

 to merge into the mottling that lies between them. 



Ther-e are thus five narrow longitudinal dark sti-ipes on the 

 dorsal surface, and in this respect the species resembles the 

 common G. quinquelineata of Eastern Australia, to which it is 

 probably closely related. It differs from that species, however, 

 in that the dark stripes are not placed at equal distances apart, 

 and in this respect it agrees with G. mediolineata Dendy, 

 var. siinularis Steel [1901 ], from South and Western Australia.. 

 It difFei'S from both these species, however, in the presence of 

 the mottling between the inner and outer lateral stripes. 



This species was common in the neighbourhood of the 

 Mundaxing \^ eir, near Perth, W.A., upwards of a dozen 

 specimens having been collected by our party. I have much 

 pleasure in naming it after my friend Professor W. J. Dakin, 

 D.Sc, who did so much to bring about the striking success of 

 our zoological expeditions in Western Australia. 



Geoplana flavilineata sp. n. 



When crawling, the dorsal surface is convex, the ventral flat; 

 there are no longitudinal ridges. In spirit the ventro-lateral 

 maigins are i-ather prominent and the ventral surface may be 

 concave. The larger of the two specimens in spirit measures 

 40 mm. in length by 3 "5 mm. in width in the middle. The eyes 

 a,re numerous, but it is difficult to make out their arrangement 

 in spirit specimens. Tlie peripharyngeal aperture is situated 

 somewhat in front of the middle of the ventral surface, the 

 genital a little nearer to the peripharyngeal than to the posterior 

 extremity of the body. 



In life the dorsal surface is dark olive-grey, or purplish, with 

 five very narrow longitudinal stripes of pale yellow, not at all 

 conspicuous. The ventral surface is yellowish white, without 

 maikings ; a.nd the horseshoe-shaped anterior tip is pink. 



The colour-markings on the dorsal surface are seen, under a 

 lens, to be arranged as follows in the most strongly marked 

 specimen : — The veiy narrow median yellow stripe is edged on 

 either side by a very nai'row dark grey band ; this is followed by 

 a very narrow yellow strij'ie (the inner paired stripe), narrower 



