Plate I. 



Fig. 1. Typical manganese nodule from Station 4658, November 14, 1904, lat. 8° 29.5' S., 

 long. 85° 35.6' W., depth, 2370 fathoms. All the nodules dredged from this sta- 

 tion may be referred to this type. The photograph shows well the symmetrical 

 shape round an axis, and the two surfaces, one smooth, the otlier roughly mam- 

 millated. 



Fig. 2. Section of another nodule from Station 4658. The apex is occupied by a well- 

 preserved ear-bone. The structure in alternate layers is well displayed, sliowiiig 

 how the internal layers espouse the contours of the dome-shaped smooth surface. 



