APPENDIX. 3G7 



plete separation of tlie South-eastern marine fauna of 

 Australia from tliat of the North-eastern or Indo-Pacific 

 portion, may be explained by reference to the distribution 

 of currents along the Australian shores. In both, as in 

 the Bathymetrical regions of the South Atlantic, the 

 Testacea of the depths are generally smaller and less 

 brightly coloured than those inhabiting the shallows. 



Dui'ing this voyage notes of the habitats of considerably 

 more than a thousand species of Mollusca and Echinoder- 

 mata were carefully registered. 



II. Enumeration of Terrestrial Pulmoniferous Mol- 

 lusca AS YET noticed IN AUSTRALIA. 



The following Catalogue is founded on the Monograph 

 of Helicidse by Dr. PfeifFer. To the species therein de- 

 scribed are added certain new ones, annomiced by Pfeiffer 

 since the publication of his work, and others, recorded for 

 the first time in this volume. It wiU be seen that a great 

 part of the Australian land-shells is as yet unfigured. The 

 exact localities of not a few have to be determined; a 

 precise record was kept of the place and circumstances 

 under which each was found during the voyage of the 

 Rattlesnake. From all we yet know the genus Helix is 

 fairly represented in New Holland, and presents some 

 very remarkable and peculiar forms; Bulimus has but few, 

 and those (mth the sole exception of B. atomatus) not 

 remarkable Australian members; a single Pupa, closely 

 resembling one of oiu- commonest European species, is the 

 only recorded Australian one; and a very remarkable 

 addition to the terrestrial conch ology of the southern 

 hemisphere has been made in a Balea of a type unhke 

 any other member of the genus. 



