THE DEPTH AND MARINE DEPOSITS OF THE l^ACIFIC OCEAN. 143 



(2) Fragments of Corals, the largest 20 by 15 by 10 mm., converted into 

 calcite, and still retaining their original structure. 



(3) Piece of white calcite, 1| by 1 by | inches, probably Coral, but it has 

 lost all original structure ; contains on one side a small Gasteropod shell, 

 half an inch in length. 



(4) Shell ( Cypraca sp.) almost entirely transformed into dolomite, 15 by 

 11 by 7 mm. 



Unlabelled Sample. 



One bottle, on which there was no label or number, contained black, fine- 

 grained material, coherent; consisting of about 50 per cent of mineral 

 particles, angular, mean diameter 0.2 mm., plagioclase, volcanic glass, horn- 

 blende, quartz, augite, magnetite, biotite ; Sponge spicules ; about 20 per 

 cent calcium carbonate, consisting of pelagic and bottom-living Foraminifera 

 in fragments, Mollusc-shell fragments, Echinoid spines, otoliths, and 

 Ostracodes. 



Manganese Nodules. 



We give here descriptions of the manganese nodules obtained at the 

 various stations of this 1899-1900 cruise of the " Albatross" : — 



Station 2, 27th August, 1899. 

 Lat. 28° 23' N. ; long. 126° 57' W. ; depth, 2368 fathoms. 



Besides the rock fragments obtained at this station, described by Dr. 

 Teall, the following were dredged : — 



A large box and a large bag full of lumps of a whitish ashy material 

 (described in detail in the Appendix), and three large bags full of manganese 

 nodules, numbering many thousands of specimens (see PI. 3, figs. 7 and 8), 

 two of which are figured in Dr. Alexander Agassiz's preliminary report.' 

 The ashy material occurs as blocks of irregular shape, probably broken off 

 some larger masses, some of which (PI. 3, fig. 7) represent a term of transi- 

 tion between cakes of ash and manganese nodules, as shown below. 



The nodules collected at this station in immense numbers vary in 

 diameter from 1 to 15 cm., and show an extraordinary variety of shape ; 

 they are never rounded and symmetrical, but are angular with large 

 protuberances. The larger ones have cylindrical holes running through the 

 mass just as in the case of the ash lumps. All the nodules take on a 

 shining lustre when rubbed with the finger-nail. The surface has not 



1 Mem. Mus. Comp. ZooL, vol. XXVI., Plate, Manganese Nodules, figs. 5 and 6. 



