36 ADDITIONAL OBSERVATIONS ON 



The opening of the peripharyngeal chamber (in spirit) is somewhat behind the 

 middle of the ventral surface and the genital aperture about one-third of the way 

 between it and the posterior end of the body. The protruded pharynx (in spirit) is 

 cylindrical. 



The ground colour of the dorsal surface is really nearly white, but almost entirely 

 obscured by the al)undant markings, which are arranged as follows: — (1) A rather 

 narrow, nearly black median stripe with irregular margins. (2) On each side of the 

 black stripe and extending to the lateral margin of the body are a great number of 

 small, closely set, irregular longitudinal streaks of various shades of brown, in some 

 specimens a good deal lighter than in others. Each side of the body, between the 

 dorsal and ventral surfaces, is occupied by an irregular stripe of very dark brown, 

 made up of a series of splotches of pigment more or less run together. The anterior 

 extremity is dark brown. 



The ventral surface is white, very beautifully spotted all over with small, distinct 

 and isolated specks of dark brown. 



When the animal is alive the lateral stripe is visible from the ventral surface 

 but not from the dorsal ; in spirit it is just visible from the ventral surface. 



■ In general appearance and size this species closely resembles Geoplana 

 qnadrangulata var. ii'ellingtoni, but we may note the following points of distinction: — 

 (1) The body is not so distinctly quadrangular in section and the sides do not slope 

 inwards nearly so much, so that the ventral surface is much wider. (2) There is a 

 distinct, though irregular lateral stripe of a very dark colour, instead of the sides of 

 the body l)eing lighter in appearance than the dorsal surface as in G. qitadrangiilata 

 and its variety. (3) The ventral surface is, in all specimens which I have seen (a 

 considerable number), very distinctly spotted with brown; while in all specimens of 

 G. quadrangtUata which I have seen it has no spots at all. 



It a curious fact that while this species was found abundantly at Fern Tree 

 Gully in March, in company with large numbers of Geonemertes aiistraliensis, 

 yet we could not find a single specimen of either of these worms when we visited the 

 spot a few weeks later in May. 



IG. Geoplana mnnda, Fletcher and Hamilton. 



This species has proved to be one of the commonest and most easily recognisable 

 of our land Planarians. Since writing my last memoir on the subject I have had 

 specimens from Croydon, Fern Tree Gully, Heidelberg, Creswick and Ballarat. At 



