HORN KXriCDITION— SUMMARY, 193 



Lako Eyro district sliow th;it it was forniorly iiioro widfly scattorod ovor tlio 

 continent. 



(2). Ostcoglossuin, a- genus rcpi'oscntcd in tropical Australia and South 



Anicn'ica. 



(3). A scries showing a strong atlinity with South America and confined in 

 Australia to tlie soutli-eastern part of tlu; continent and Tasmania (not passing or 

 scarcely at all north of the Dividing Range in Victoria) and including Haplochiton, 

 Apliritis and the species of Galaxias, and amongst Cyclostomata, CJeotria. 



So far as the distribution of forms in the Australian region is concerned the 

 most important point is the clear demarcation of a south-eastern series from an 

 intei'ior series* whii-h is especially cliaracteristic of the Murray River system. Tiie 

 former includes Lates 1\1 icroperca, Aphiitis, Haplochiton, Prototroctes, Galaxias, 

 Ag.-inostoma, Gadopsis, and amongst Cyclostomata Geotria and Mordacia. The 

 latter includes Oligorus, Therapon, Muri-ayia, Ctenulates, Chatocssus, Copidoglanis. 



Vermes. — {a) Olii^ochie/a.y Amongst Earthwor'ms three families are represented 

 in Australia, \"iz., Pericha'tidic, Cryptodrilida' and Acanthodrilida'. At present 

 our knowledge^ with regard to the Earthworm fauna is limited almost entirely to 

 the eastern side of the continent, tiiough we may feel sure that it will be found to 

 l)e nuich more abundant here than in the diiei' west. 



Certain forms of Lund)rici(Ue are very common (Allolobophora and Allurus), 

 but as theii' range is restricted to the neighbourhood of settlement, in which they 

 have almost completely ousted the indigenous fauna, they may safely be regarded 

 as introduced foims. 



(^n tlie eastern side the following are the more important points in regard to 

 distribution : — 



Acanthodrilus is entirely confined to the north, not reaching further south 

 tiian Queensland and having one species, doubtless derived from the nortli-east, in 

 the Centre. True Pericha'tes are also confined to the noith. 



Diporocha'ta is represented by two species in North Queensland, but is other- 

 wise restricted to the soutli-east (six species). Fletcherodrilus has one species in 

 Queensland and one in New South Wales. 



* Dut.iils with ivnanl to this .ire j,'ivcn in .a paper by -Mr. A. II. S. Lueas "On the Vcitebratc F.mna of Victoria," 

 read before the Royal Society of Victoria, in .July, ISOO, and now in course of publication in Proe. R.K. Vict., vol. ix.; 

 and also in the Presidential Address of the author to the l)iolo;,'y Section of the Austr.alasian Association, Ilobart, 

 1S112, "On the Fauna and Zoolog-ic.al Relationships of T.asniania." 



t The classification followed is th.at uiven bv Bcddard in his Monograph of the order OliuocliMta, \'ri'Xi. 



