6 On the Foraminifera of America and 
to the Atlantic than to the Pacific. This also is to be ex- 
plained by the direction of the currents ; for, as these come 
from the south-west, they must carry the water more easily 
to the east from Cape Horn than to the west, and hence must 
impart more of their peculiar species to the Atlantic than to 
the Pacific. This agrees extremely well with the distribution 
of the five species of Foraminifera. 
Of the eighty-one species observed on the coasts of South 
America, fifty-two occur in the Atlantic Ocean without even 
one of them presenting itself in the Pacific, and thirty are 
peculiar to the Pacific, without a single individual of them 
being found in the Atlantic Ocean. The only species com- 
mon to the two seas (Globigerina bulloides), lives not only on 
both coasts of America, but also in the Canary Islands, in the 
Mediterranean Sea, and even in India. As it occurs every- 
where, it does not alter the well-grounded results. The fol- 
lowing list of the species will exhibit more clearly what I have 
said ;— 
Species. Of the Atlantic. Of the Pacific. 
Oolina compressa ............ Malvinas. 
Teevigatia .c..cccsneeeree Do. 
Vilardeboana......... Do; 
CAUCAUA, Weoceescac esos Do. 
Isabelleana ......... Do. 
ME] Os ges cheewecccssvass Do. 
TAVICOSEaiecccasses-s ea Do. 
SiElabdsreec cares eeoce Do. 
TNOFNAGA css steceosackae Do. 
striaticollis ......... Do. 
Dentalina acutissima ...... Do. 
Marginulina Webbiana...... Do. 
Robulina subcultrata......... Do. 
Nonionina cultrata ......... Do. 
subcarinata.. ... Do. Ss 
pelagica ......... BA in the open sea, 
Polystomella Lessonii...... Malvinas ; Patagonia. 
Owenii ...... Patagonia. 
articulata ... Malvinas; Patagonia. 
Alvarezii ... Do. 
Peneroplis pulchellus .. ... Do. 
carinatus........ Patagonia. tee 
Rotalina Alvarezii ......... { eee 
