APPENDIX. 367 



plete separation of the South-eastern marine fauna of 

 Australia from that of the North-eastern or Indo-Pacifie 

 portion, may be explained hy 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. 



During this voyage notes of the habitats of considerably 

 more than a thousand species of MoUusca and Echinoder- 

 mata were carefully registered. 



II. Enumeration or 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, announced 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 locaUties of not a few have to be determined; a 

 precise record was kept of the place and circumstances 

 imder which each was found during the voyage of the 

 Rattlesnake. From aU we yet know the genus Helix is 

 fairly represented in New Holland, and presents some 

 very remarkable and peculiar forms j Bulimus has but few, 

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

 remarkable Australian members; a single Pupa, closely 

 resembling one of our commonest European species, is the 

 only recorded Australian one; and a very remarkable 

 addition to the terrestrial conchology of the southern 

 hemisphere has been made in a Balea of a type imlike 

 any other member of the genus. 



