ATTSTEALIAN EEGION". 103 



burrowing in floating logs used as landing places, 12 miles from 

 th.e sea, up the Pantai river. The mangrove swamps abound 

 with Cerithidium, Terebralia Telescopium, Potamides palustris, 

 and Quoyia ; Auricula Midae and Polydonta scarabaeus inhabit 

 the damp woods. 



11. Papua A2to New Ibelajstd. 



The land shells of New Guinea are nearly all distinct from 

 those of the Philippines and Moluccas, and include some related 

 to the Polynesian types. The Louisiade Islands to the south- 

 east and New Ireland on the north of New Guinea are included 

 with it. 



Helix 30 Partula 3 Leptopoma 1 



Nanina 7 Pupina 3 Cyclotus 1 



Bulimus 2 Otopoma 1 Helicina 2 



Cyrence are numerous in this region. Cyclostoma australe is 

 common to the Australian Islands and New Ireland ; C. Massence 

 to Australia and New Guinea, and C. Vitreum to New Ireland, 

 New Guinea, the Philippines, and India. 



12. AUSTEALLAN" EeGION. 



Both fauna and flora of Tropical Australia are distinct from 

 those of New South Wales and Tasmania, the principal barrier 

 being the desert character of the interior ; but the localities of 

 the land shells have not been defined with sufficient accuracy to 

 show whether they are equally distinct. The most complete list 

 is given by Prof. E. Porbes, in the Appendix to McGillivray's 

 Narrative of the Yoyage of H.M.S. Eattlesnake (1846-50) ; it 

 specifies 48 Helices (of which H. pomum is the most conspicuous), 

 10 Bulimi, an Achatina, 6 Yitrinas {Helicarion) belonging to the 

 mainland, and one from the Lizard Islands, and a dextral Balea 

 (australis). Pupa and Helicina {Gouldiana) are only found on 

 the islets off the north-east coast, and Pupina {bilinguis) at Cape 

 York and the adjacent islets ; a portion of the province which is 

 densely wooded, and lies within the rain region of the Asiatic 

 Islands. Cyclostoma hilahre of Menke's Catalogue is probably 

 West Indian. The fresh- water shells of Australia are Flanorhis 

 Gilberti, Jridinae? (YictoriaE.), Unio auratus, cucumoides, super- 

 hus [Ryridella), australis, Corhicula 4 species, Cyrena 3, Cyclas 

 egregia (Hunter E.), Pisidium semen and australe, the last common 

 to Timor. 



More recently Cox has described 178 species, belonging prin- 



