T. V. HODGSON. 



The remainder of the collection falls into well-known genera, and does not call for 

 any special comment. A list is appended below of all the species now known from the 

 Antarctic and sub- Antarctic regions, those taken by the ' Discovery ' being marked with 

 an asterisk. The numerous islands scattered about the southern seas have long been 

 considered to pertain to the sub-Antarctic region, and for this reason I have made the 

 mean annual isotherm of 45° ¥., as indicated by Sir John Murray in the concluding 

 volume of the " Challenger Reports," its northern limit. This includes all that can 

 reasonably be considered as belonging to this region, and coincides very closely with 

 the opinion expressed by Professor P. Pelseneer in his Report on the Mollusca of the 

 ' Belgica ' Expedition. For the Antarctic proper the latitude 60° S. seems sufficient 

 as it includes all the glaciated lands of Antarctica, and the shallower waters less than 

 lOOOfm., connected therewith. 



Antarctic. Sub-Antarotio. 



