FAXJNA OF THE CLYDE SEA-AEEA. 



471 



If the preceding table be summed up in the same manner as the 

 first one the result is fouud to be as follows : — 



Arran Basin. 



Brodick 

 Basin. 



50 

 to 

 92. 



1 



22 



10 

 4 

 3 



40 



75 

 to 

 92. 



Kilbren- 



nan 

 Basin. 



50 

 to 

 85. 



9 

 1 

 7 



26 



70 

 to 

 85. 



Inch- 



marnoch 

 Basin. 



50 

 to 



104. 



5 

 23 



1 

 13 



3 



9 



54 



80 

 to 

 104. 



5 

 21 



1 

 12 



3 



9 



51 



Cura- 

 brae 

 Basin. 



50 

 to 

 62. 



16 



15 



36 



Upper 

 Loch 

 Fyne. 



50 

 to 

 77. 



5 

 15 

 1 

 8 

 4 

 6 



39 



65 

 to 

 77. 



3 

 8 



35 

 to 

 41. 



It is obvious at once that these numbers do not show so 

 clearly as those previously obtained the gradual diminution in 

 the number of species in the different basins. There is a slight 

 tendency in this direction, but the exceptions are rather nume- 

 rous, and if we take the bottom faunas of each basin instead of 

 that below 50 fathoms the series of numbers is : — 



24, 12, 51, 36, 22, 26, 42, 32, 21. 



This result is extremely interesting because it seems to show 

 that the bottoms of the remoter basins have a fauna which 

 approaches the more seaward basins in respect of variety more 

 nearly than do their faunas taken as a whole. It suggests the 

 possibility that we have in these basins, in addition to the fauna 

 derived from the present outer seas, which seems to be gradually 

 making its way into them, a fauna which has been in them for a 

 much longer period. 



Eegarding tlie range of distribution of the species which are 

 confined to these depressions we find : — 



LINN. JOUllN. — ZOOLOGY, VOL. XX. 36 



