Land Planarians, Tasmania and S. Australia. 179 



The copulatoiy organ may (in spirit) be protruded from the 

 genital aperture in the form of a bladder-like vesicle, covered 

 with numerous very minute, granule-like papillse. 



A good deal of variation occurs in the intensity of the 

 colouration, and the consequent distinctness or otherwise of the 

 stripes. The median stripe appears always to be the darkest and 

 best defined. 



There is a dwarf variety from the north coast of Tasmania, of 

 which I received about twenty specimens collected by Mr. G. W. 

 Officer, in February, 1892, and which differs from the types only 

 in its very much smaller size. 



At first sight this species looks a little like the common 

 Australian G. qiunquelineata., but it differs markedly in the shape 

 of the body in spirit, the ill-defined character of the paired 

 stripes, and the great breadth of the inner ones. 



Localities. — Parattah (Professor Spencer; very common); 

 Mount Wellington (L. J. Balfour, Esq.); near Newtown Falls 

 (A. Morton, Esq.) ; North Coast (G. W. Officer, Esq. ; dwarf 

 variety only). 



Geoplana die/nenensis, n. sp. 



This is a large and remarkably handsome species. The 

 following description is taken from two specimens received alive 

 from Mr. L. J. Balfour, who collected them on Mount Wellington 

 in March, 1892 :— 



Body at rest quite flat on the dorsal surface ; broad ; with narrow, 

 inwardly sloping lateral surfaces. When crawling almost the 

 same shape in section but not quite so much flattened ; tapering 

 very gradually in front and behind ; unusually sharp-pointed 

 behind. Length when crawling about 70 mm. ; breath about 6 

 mm. Eyes as usual in Geoplana, continued all round the horse- 

 shoe-shaped anterior margin. Ground colour of the dorsal surface 

 sepia-brown, with indications of three darker longitudinal stripes, 

 all ill-defined. (In specimens subsequently received in spirit from 

 Mr. Morton these stripes are better marked ; there is one narrow 

 median stripe and a pair of much broader ones close to the 

 margins of the dorsal surface). The dorsal surface is sprinkled 

 all over, stripes and all, with small whitish specks ; while under 

 a low power of the microscope much smaller greenish specks, 



n2 



