CHAP. III. ] TENERIFFE TO SOMBRERO. 208 
cent pores coalescing into a roughly hexagonal net-work, so that 
the pore appears to lie at the bottom of an hexagonal pit. At 
each angle of this hexagon the crest gives off a delicate flexible 
calcareous spine, which is sometimes four or five times the di- 
ameter of the shell in length. The spines radiate symmetric- 
ally from the direction of the centre of each chamber of the 
shell, and the sheaves of long transparent needles, crossing one 
another in different directions, have a very beautiful effect. 
The smaller inner chambers of the shell are entirely filled with 
an orange-yellow granular sarcode; and the large terminal 
chamber usually contains only a small irregular mass, or two or 
three small masses run together, of the same yellow sarcode 
stuck against one side, the remainder of the chamber being 
empty. No definite arrangement, and no approach to struct- 
ure, was observed in the sarcode; and no differentiation, with 
the exception of bright-yellow oil- globules, very much like 
those found in some of the Radiolarians, which are scattered 
apparently irregularly in the sarcode; and usually one very 
definite patch of a clearer appearance than the general mass, 
colored vividly with a carmine solution; and the presence of 
scattered particles of bioplasm was indicated by minute spots 
here and there throughout the whole substance, which received 
the dye. 
When the living Globigerina is examined under very favora- 
ble cireumstances—that is to say, when it can be at once placed 
under a tolerably high power of the microscope in fresh still 
sea-water—the sarcodie contents of the chambers may be seen 
to exude gradually through the pores of the shell, and spread 
out until they form a kind of flocculent fringe round the shell, 
filling up the spaces among the roots of the spines, and rising 
up a little way along their length. This external coating of 
sarcode is rendered very visible by the oil-globules, which are 
oval and filled with intensely colored secondary globules, and 
are drawn along by the.sarcode, and may be seen with a little 
