198 IIOUN EXPEDITION — SUBIMAKY. 



Cl.ux'iKc. lli\fr, ;iii(l also Tasiuania. iJii tlic inaiiilaiicl it luitunilly lui'i'm'.s to a 

 coitaiu L'xtfiit, wliLuo tlio J)ivicling lianges falls away at its vvestuni vud, witli the' 

 fauna of the interior Init in the main it is strikingly dissimilar to this. 



It is characterised by such forms as Acrobates, Gymiiolielideus, Petauroides, 

 Phaseolarctos, Phaseolomys, Tiiylaeinus and vSarcophilus (the two latter now con- 

 tined to Tasmania) amongst mammals ; Amaurodi-yas amongst Ijirds ; Myxopliyes, 

 Pliilocryj)hus, Phanerotis and the stiong de\(^lopment (tf Lymnodynastes amongst 

 Amphibia; Lates, Mierofierea, CHrella,, Aphritis, Agonostoma, C!ad(_)})sis, Proto- 

 troctes, (JaJaxias, j\]oi'da,eia, tleotria amongst tishes ; (Jundlaehia, Cysto[)elta, 

 llelicarion amongst Mollusca ; Diporochu'ta, Ci'yptodrilus, Digaster, INIegaseolex 

 and Megascolides amongst Earthworms. Tlu; most important feature of the faunti 

 is the South American atiinity. 



The name is adopted from that of IJass Strait, across which, when uplifted, 

 tlie South American contingent must have passed. 



(3). The Eyrean sub-region. This includes the whole of the interior, southern 

 and western part of the continent, the coastal I'anges on the east and south-east 

 separating it from the Toi'resian sub-region in the north-east and the Uassian 

 region in the .soutli-east. 



It is characterised by such forms as ]\Iyrmecobius, Notoryctes, Dasyuroides, 

 ^Vntechinomys, Petrogale, Onychogah:!, Lagoi'chestes, Caloprymnus, Lagostrophus, 

 Tarsipes amongst Marsupialia; Conilurus (llapalotis) amongst Rodents; Mt'gaderma 

 amongst IJats ; Leipoa amongst Birds; Diplodactylus, Nephrurus, Amiihibolurus 

 (most largely), Moloch, Tympanocryptis, Ophidiocephalus, Chelosauria amongst 

 Lizards; Kmydura amongst Chelonians ; Myobatrachus anujngst Amphibia. ; Uli- 

 gorus, Ctenolatcs, Murrayia, Copidoglanis, Plotosus amongst Fishes ; Apus, 

 Eulimnadia and the most distinctive types of Estheria and Limnadopsis amongst 

 Crustacea ; Liparus and the IMiagada grouj) of Helices amongst Molluscs. 



The name Eyreaii is suggested for this region in consecjuence of the fact that 

 Lake Eyre is to be regaided as the centre of the great internal Lacustrine region, 

 which was closely associated with the former development of the now e.xtinct series 

 of gigantic Diprotodont and Stiaitiiious forms, which during Pliocene times formed 

 perhaps the most distincti\e fauna of the continent, whilst it was probably in the 

 area centering around Lake Eyre and during the peiiod of its gradual desiccation 

 that the present fauna of the interior of the continent was developed. 



These three faunal sub-regions are indicated on the accompanying map. 



