THREE CRUISES OF THE “BLAKE.” 
168 
shells, enabling them to float with greater facility by increasing 
their surface immensely. When alive, “the sheaves of these 
spines cross in different directions, and have a very beautiful 
effect.” The inner chambers are filled with a colored sarcode, 
either red or orange. No trace of pseudopodia has as yet been 
observed, or any extension of the sarcode beyond the shell. 
Globigerina bulloides has been found pelagic everywhere in 
the West Indies, as well.as in the bottom dredgings of the Ca- 
ribbean and the Gulf Stream. It is not so abundant after pass- 
ing north of Cape Hatteras. I have not found it pelagie off the 
coast of the Middle States. Hastigerina is eminently a pelagic 
type. It had been known from the coast of South America 
many years previously to its rediscovery by the * Challenger.” 
It is not an uncommon pelagic type off the Tortugas, and was 
found on one occasion, on a very calm day, swarming on the 
surface with Globigerina bulloides. 
A minute scale-like foraminifer, Discorbina orbicularis, is 
commonly found in the coral reefs of the West Indies. An- 
other peculiar form, also found living in the West Indian reefs, 
A 
Fig. 513. — Cymbalopora bulloides. 4°, (Challenger.) 
is Cymbalopora; one of the species of the genus, however, C. 
bulloides (Fig. 513), is also pelagic. 
The most protean of West Indian rhizopods is perhaps Car- 
penteria balaniformis. (Fig. 514.) Its regular structure is 
Fig. 514. — Carpenteria balaniformis. $. (Goüs.) 
rotaline, but, owing to its propensity for developing additional 
chambers from the upper extremity and from the chamber 
