468 AUSTRALIAN HIRUDINEA, III., 



a freshwater gastropod, Bythinia australis Tryon, etc. Indeed, 

 wherever I have noticed specimens of these molluscs, I have 

 never yet failed to obtain specimens of Glossiphonia, nor have I 

 ever obtained specimens where these molluscs do not occur. This 

 association between freshwater gastropods and Glossiphonid 

 species is not unusual in many parts of the world, and there can 

 be no doubt that the former form the main host of these leeches. 

 At Wallis's Creek I found specimens in intimate association with 

 the molluscs. 



Grube recorded Clepsine octostriata from Rockhampton (New 

 Holland); and the same genus is represented in the vicinity of 

 Brisbane, according to the evidence of Mr. Henry Tryon, I 

 have found no record of the occurrence of the genus in Victoria,^ 

 but I think there can be no doubt that the genus is extremely 

 abundant throughout Eastern Australia. I am indebted to Mr. 

 Geoffrey Smith, of Oxford, for specimens which he obtained at 

 Great Lake, Tasmania, representing a specially interesting new 

 species. These were obtained under stones, along the margin of 

 the lake, and associated with a species of Ancylus. 



I must also express my thanks to Mr. Tillyard for specimens 

 from Auburn, and to Mr. Thomas Steel for some excellently 

 extended and preserved individuals of Limnohdella, which have 

 been of the greatest use to me in working out that form. 



Glossiphonia intermedia, sp.nov. 



The individuals of this new species were obtained at Orphan 

 School Creek, near Fairfield. Only two specimens were secured^ 

 and these were found attached to submerged pieces of timber in 

 a pond in the bed of the creek, the only other form of life notice- 

 able being Bythinia australis. 



The specimens, on being placed in an aqueous solution of 

 corrosive sublimate, quickly rolled themselves into a ball, afcer 

 the fashion of Oniscus, as do most species of the genu's. This 

 form is a very active species, and, when disturbed, moves fairly 

 rapidly, unlike most species, and after the fashion of Herpobdella 

 and Limnobdella. 



