210 Proceedings of the Boijcd Physical Society. 



The species whicli have been reported from the Oceanic 

 areas are distributed thus : 



Q& species are recorded from only one Oceanic area. 

 15 ,, ,, two Oceanic areas. 



3 ,, ,, three ,, 



These numbers show that about 75 per cent, of the oceanic 

 forms are confined to one ocean, and that cosmopolitan forms 

 must be regarded as exceptional. 



The species accurring in the seventeen Littoral regions 

 may be arranged thus : 



199 species are recorded from only one Littoral area. 

 27 ,, ,, two Littoral areas. 



12 ,, ,, three 



4 „ ■ ,, four ,, 



1 ,, ,, five ,, 



2 „ ,, six ,, 

 1 „ ,, ten 



About 80 per cent, therefore of these forms are confined 

 to one region — a striking confirmation of the proposition that 

 littoral forms in general belong to many species, each of 

 which is confined within narrow limits. 



Thirty-five species are recorded from both Oceanic and 

 Littoral regions, but the majority of these are typically 

 pelagic, and hence their occurrence in the latter areas must 

 be regarded as accidental ; furthermore it will be seen that 

 almost without exception the Littoral regions where a species 

 has been found are those bordering upon its proper ocean, 

 which is precisely what would have been expected. 



In publishing this Catalogue, I must not omit to place on 

 record my thanks to friends who have helped me in various 

 ways. Drs Fischer, Pfeffer, and de Eochebrune, and Mr Edgar 

 A. Smith have courteously answered queries relating to the 

 specimens under their care ; while my good friend. Professor 

 Steenstrup, not only gave me great assistance in my work 

 upon the " Challenger " Cephalopoda during my visit to 

 Copenhagen, but has also been kind enough to look over the 

 present list, and to furnish me with many valuable sugges- 

 tions during its preparation. 



