Plate 2. 



Fig. 3. Typical nodule from Station 4662, November 16, 1904, lat. 11° 13.8' S, 

 long. 89° 35' W., depth, 2439 fathoms. The nodules from this station are, 

 contrary to what obtains at most stations, variable in shape and structure. This 

 photograph represents a typical nodule of the second category as indicated in the 

 text. The one surface is finely mammillated and resembles shagreen, while the 

 other surface is smooth, with broad, flat protuberances. 



Fig. 4. Typical nodule from Station 4711, December 31, 1904, lat. 7° 47.5' S., 

 long. 94° 5.5' W., depth, 2240 fathoms. This large nodule shows the high degree 

 of mammillated structure, the large mammillae being covered by smaller mam- 

 millsB. All the nodules dredged at this station show these characters. 



