LAND-PLANARIAIVS FROM WEST AUSTRALIA. 697 



mticli 3^fellower than in G. tasmaniana. The body (in spirit) 

 is thicker, less flattened dovsally, and much moi-e rounded at the 

 margins. Steel [1901 his] has de.scribed a supposed variety of 

 Geoplana tasmaniana which he calls jiavicincta, which seems to 

 come a good deal nearer to G. coniitatis than the typical form. 

 It seems to me hardly likely, however, that the West Australian 

 species is ideally identical with the Tasmanian " variety." 



I have eleven specimens of this species, all collected in the 

 neighbourhood of Mundaring Weir. The specific name comitatis 

 is given in allusion to the British Associatiou. 



B, S'pecies collected in Tasmania, 

 GeoplAnA TASMANIANA (Darwin) *. 



Flanaria tasmaniana Darwin [1844]. 



Geoplana tasmaniana Fletcher &, Hamilton [1887J. 



Geoplana tasmaniana Dendy [1893J. 



Geoflana half our i von Graff [1899J, 



Geoplana tasmaniana Steel [1901 his\ 



This certainly seems to be by far the commonest of the 

 Tasmanian Land-Planarians, and it has been obtained fi'om many 

 Avidely separated localities. In September 1914 Di'. Nicholls 

 collected a number of specimens on Mat-ia Island, and it was also 

 much the commonest species in the neighbourhood of the Great 

 Lake, which some of us subsequently visited. 



The following notes were made on living specimens from 

 Maria Island : — " Eyes as usual. When crawling long and 

 " narrow, but dorsal surface somewhat flattened a,s well as 

 " ventral. Dorsal surface very pale yellow with very narrow 

 " median stripe of dark grey or brown and two wider stripes of 

 " the same colour but less intense. Ground-colour between 

 " median and wide stripes minutely flecked with brown, also 

 " tine marginal mottling of brown separated from wide dorsal 

 " stripe by band of clear yellowish gi'ound-colour, Colour of 

 " stripes varies from olive-brown to reddish." 



The marginal band of mottling may develop into a more or 

 less distinct stripe and in spirit it becomes submarginal, visible 

 from the ventral but not fi-om the doi-sal surface, so that thei'e 

 appear to be only three stripes on the dorsal surface (one narrow 

 and two broad) and a narrow yellow margin. 



Specimens when crawling measure about 45 by 3 mm. The 

 largest specimens in spirit measure about 34 by 3'5 mm. 



The shape of the body in transverse section, in spirit-specimens 

 is somewhat fla,ttened both above and below and with slightly 

 pi-onounced marginal ridges. 



A colour variety, represented by two specimens from the neigh- 

 bourhood of the Great Lake, is characterized by the intensification 



* [The parentheses around the names of authors placed after scientific names in 

 this paper are used in accordance witli Article 23 of tlie International Rules of 

 Nomenclature {Proc. 7th Int. Cong. Boston, 1907, p. -U ( L912)).— Kditou. 



