ON THE FORAMINIFEEA OF THE FAROE CHANNEL. 169 



Jaculella, Hyperammina, Marsipella, Iiaplophragmium t 

 and Webbina — are conspicuous by their absence from 

 the cold area, and are only very sparingly repre- 

 sented by the smaller varieties of Lituolidse, with 

 one exception, Reophax scorpiurus, which is com- 

 paratively rare in the warm area but is found 

 abundantly and of very large size in the cold area. 



From this we may safely conclude that Cornuspira 

 foliacea and Reophax scorpiurus are natives of the 

 colder waters of the ocean. i^gain, the genus 

 Bidimina is found in its typical condition spread all 

 over the warm area, while only a few starved 

 varieties are found in the cold area. 



The genus Lagena would appear to flourish best 

 in the colder waters of the ocean, as is shown by 

 the results of the Challenger expedition. In the 

 great ocean basins, in depths greater than 1000 

 fathoms, where the temperature is below 30° F., this 

 genus was found most abundantly. It is represented 

 in the cold area by no less than twenty-eight species 

 and varieties ; and by eighteen only in the warm area. 



Eight species of Nodosaria have been taken in the 

 warm area, and but three in the cold. 



The Cristellarice also attain to a very large size in 

 the warm area, where six species were taken, while 

 in the cold area only one has been found. 



With reference to the pelagic forms, these two 

 localities show a peculiarly striking difference as to 

 distribution. The Arctic varieties of Globigerinidse, as 

 Globigerina pachy derma and Globigerina dutertrei> 

 have their home in the cold area ; while Globigerina 

 bulloides (typical form), Globigerina inflata, and 

 Globigerina (Orbidina) universa flourish in the warm 

 area, and are very sparingly found in the cold area. 

 I am inclined to believe that the very minute 

 and young forms of Globigerinidse are carried by 

 the warm currents from the localities where the 

 surface-waters are of a high temperature, into the 

 colder waters of the Arctic and Antarctic Seas ; that 

 they suit themselves to the change of climate for a 



