Biographical Notice of Alcide D’Orbigny. 75 
very suggestive to the paleontologist. Torrid Zone, 375 species; 
Temperate Zone, 350; Frigid Zone, 75: so that, as in Mollusea, 
the seas of hot climates are more productive of species of Foram- 
simultaneously, just as the material deposits n 
Widely different in character at localities by no means very re- 
mote. Unquestionably the reasoning is , and equally ap- 
Plicable to the geological deposits of all — of the world.* 
quiries, that these forms are more complica 
hotter regions, and further, that it is probable the fossil genera 
ned 
po the microscopical Cephalopoda, as he then considered them to be, from the 
é Phoniferous genera with which they had been confounded. De I previ- 
usly proposed such a separation, and founded upon it his Siphonoides and Asipho- 
his a = — D’Orbigny felt that there were other differences, an 
bs wast e term Foraminifera. His ‘ 
4-88 founded upon this view of the subject, and remained 
totally distinct class, to which he gav e plectomeres. Desjardins there- 
fore gav tania pti ae classification of these mi- 
ton 8, have been shown, by the examina- 
of the deep-sea soundings of the Atlantic, to be as active now as in ancient 
*pochs in laying the foundations of future stra 
