PRESIDENTIAL ADDRESS. 



21 



TABLE I. 

 General Numerical Results. 



Croups 



Brachiopods . 

 Pelecypods 

 Scaphopods . 

 Gastropods 



Totals . 



No, of Xo. of 

 Genera Species 



2 

 119 



J 3 

 170 



35 

 491 



1 80 709 



Species in the 



Species 

 common to 



LitoralArchib. Abyssal Two ! All 

 Area Area Area Areas Areas 



8 

 98 



17 

 280 



4<>3 



Abyssal I 



Fami- 



12 

 114 



28 

 222 



;76 



In 



5 



49 



(Veil era 



'5 



I 



29 



47 



o 



'9 



2 



4' 

 65 



TABLE II. 

 Genera represented by more than one Species in the Abyssal . Irea. 



Total, 24 Genera and 87 Species. 



For the naturalist of to-day the most interesting feature of 

 abyssal life is not that it furnishes him with singular and 

 archaic forms, useful in his study of extinct genera ; nor the 

 beauty and rarity of the creatures living under such unusual 

 conditions. The most important characteristic of abyssal life is. 

 that it, and it alone, exhibits a fauna in which reciprocal strug- 

 gle is uearlv eliminated from the factors inducing variation and 



