GEOGKAPHICAL DISTRIBUTION, ETC. 279 



some of the larger Nodosa rice, which are found in the 

 West Indies ; Alveolina, recorded from the equatorial 

 parts of the Indian and Pacific Ocean ; or Cydo- 

 clypeus, which is fouiid in a few widely separated 

 localities, off Borneo, Solomon Islands, the Fijis, and 

 Funafuti. 



In studying the question of distribution we shall 

 find that each distinct kind of sea-bottom contains its 

 own group of organisms, microscopic and otherwise. 

 To take the well-known example of the Glohigeriiui 

 Ooze, this for the most part, in typical samples, is 

 composed of the shells of the pelagic or surface- 

 living Foraminifera, viz. Globigerina, accompanied by 

 other pelagic genera, as S'plicEroidina and Pulvui/iIiiKt, 

 associated frequently with an admixture of bottom- 

 living forms, such as Beopliax, CristeUaria, Truncatu- 

 li)ia, and Botalia. In order to gain a clear idea of the 

 association of Foraminifera in the various kinds of 

 deposits now being formed either in deep oceanic 

 areas or on the shallower continental slopes, we shall 

 now proceed to select typical examples of such de- 

 posits from high and low latitudes. 



The two principal types of foraminiferal deposits 

 are the Pelagic Dejjosits, formed in deep water, far 

 removed from land, and the Terrigenous Deposits, 

 formed in moderately deep and shallow water closer 

 to land masses. 



The bottom areas of deep-sea deposits have a tem- 

 perature below 40° F., but little subject to variation, 

 and then only when in proximity to the 100-fathom 

 line. An idea of the range of temperature in the 



