BY E. J. GODDARD. 475 



shifting backwards of the male pore, until it came to lie between 

 annuli 1 and 2 of somite xii. At this stage the stagvalis-group 

 would seem to have left the main stem. No further moving 

 backwards of the male pore seems to have then resulted in a 

 moving forwards of the female pore in forms situated on the main 

 stem, the examples of these conditions being represented in G. 

 heteroclita. The stagnalis-gvou^. after leaving the main stem, 

 developed the following characters— (1) a single pair of eyes, (2) 

 crop-diverticula simple, never exceeding six pairs, (3) a smooth 

 integument, (4) egg-clusters arranged in two longitudinal rows, 

 and (5) genital apertures separated by one annulus (this character 

 probably having developed much earlier). 



Glossiphonia heteroclitaC?). 



The occurrence of this now universally distributed species in 

 Australia, is not unexpected. In the first examination of G. 

 australieiisis mihi, I was strongly inclined to regard that form as 

 a variety of G. heteroclita^ but ultimately came to the conclusion 

 that I was dealing with quite a different species. That form is 

 very large, when compared with G. heteroclita, and, having now 

 had the opportunity of examining the latter form, I am convinced 

 that G. aitstraliensis is entitled to new specific rank. G. hetero- 

 clita is abundant in Europe and North America. 



The single individual representative of this species was obtained 

 at Narara Creek, in the Gosford district. It was found adhering 

 to a piece of floating timber, and evidently was not abundant in 

 that particular spot, as I failed to obtain other specimens after 

 several hours' search. The creek had been in flood a few weeks 

 before, and the leech may, as a result of this, have been trans- 

 ported on the timber from the upper reaches of the stream. No 

 freshwater mollusca were found, but small native perch were 

 abundant, and very possibly the latter may serve as a host for 

 the species. 



External characters — The body is clear and gelatinous like the 

 substance of a Medusa or jelly-fish, the crop, with its caeca, showing 



