GEOGEAPHICAL DISTEIBUTION, ETC. 283 



the comparatively nncominon P. c]-a>;s<i appears to 

 preponderate in this locality. Arenaceous Foraniini- 

 fera are almost entirely wanting. The occurrence of 

 two or three specimens of Clavulina conuniiiijs 

 forms perhaps the most interesting feature in the 

 dredging.' 



As a typical specimen of Glohigerlua ooze from a 

 position nearly under the equator in mid-ocean we 

 may quote the ' Challenger ' soanding. 



' Station 271.— S. Pacitic. Lat. 0° 33' S., long. 

 151° 34' W. Depth, '2,425 fathoms; bottom tem- 

 perature, 1-0° C. (33-8° F.)' 



' This deposit contains a large proportion of 

 Eadiolaria. 



' The larger Foraminifera were chiefly of two 

 species, Pullenia (>h//(piiloculata and Pulvinulina 

 tumidci. All the common varieties of Glohigerina 

 were present, together w4th such genera as Lageiia, 

 Nodosaria, Triuicatu/iiid, and Nojiioiiiiia ; but per- 

 haps the species most characteristic of the locality 

 were PnlviiniUiia favn>i and Elirenhergina serrata.' 



Pteroijod Ooze. — The foraminiferal fauna of a 

 pteropod ooze largely depends upon the position of 

 the deposit, whether in proximity to land or far 

 removed from any coast line. This is shown by the 

 following soundings taken by the ' Challenger,' in 

 which, in the one case, wdiere the deposit was formed 

 at a considerable distance from the land, the fauna 

 was restricted to an almost purely pelagic series, 

 chiefly of Glohigerina', whilst, on the other hand, 

 the series obtained from a rich calcareous, pteropod 



