NARRATIVE OF THE CRUISE. 
939 
found in the deposits, but tlieir broken down parts, the Rhabdoliths, are very numerous 
in all the Globigerina oozes of the tropics ; Coccospheres are found in the deposits of 
subtropical regions, even at very great depths, and their broken down parts, the 
Goccoliths, frequently make up a considerable percentage of some G-lobigerina oozes. 
There is a considerable variety both in the form and size of Coccospheres and Rhabdo- 
spheres, some varieties having the component parts (Coccoliths and Rhabdoliths), much 
A 
Pig. 340. — Rhabdospheres, from tbe surface. A, 500 times ; B, 2000 times, natural size. 
more compactly united into a sphere than others. The interior of the spheres is 
perfectly clear when examined fresh from the surface, and becomes coloured brown 
with iodine solution, but with iodine and sulphuric acid no blue colour was observed. 
They were never observed to colour with carmine solution. When the calcareous parts 
are removed by dilute acids a small gelatinous sphere remains, in the outer layer 
of which the Coccoliths or Rhabdoliths were embedded. 
Bathybius. — Mr. Murray writes : — “ During the first two and a half years of the 
cruise the muds, oozes, and clays procured by the sounding tube, dredge, and small tow- 
nets were carefully examined for Bathybius. The thin watery surface layer of the 
deposit was carefully removed as soon as it arrived on board ship, placed under the 
microscope, and examined for hours at a time, but no protoplasmic movements were 
observed. On treatment with iodine and carmine solutions the appearances described by 
Huxley and Haeckel were not observed. 
