THREE CRUISES OF THE “BLAKE.” 
162 
species of Pelosina, a flask -shaped rhizopod with thick walls 
composed of globigerina ooze. Another type of the same group 
resembles a long-necked flask with branching caleareous pro- 
jections, but thickly covered outside with fragments of sponge 
spicules. Large fragments of a mammillary mass of loosely 
Fig. 490. — Sorosphiera confusa. 49. (Brady.) 
crumbling character, Sorosphera confusa (Fig. 490), are not 
uncommon from the Caribbean globigerina ooze. 
Hyperammina elongata (Figs. 491, 491 a), almost a cosmo- 
Fig. 491. Fig. 491 a. 
Hyperammina elongata. T.  (Goés.) 
politan speciés, builds a long, slender tube which attains a length 
of 15 mm. Sometimes it is constructed of siliceous sand and 
sponge spieules. It has been dredged 
in the North Atlantic to nearly 1,800 
fathoms. The genus dates back to the 
silurian. Rhabdammina abyssorum 
(Fig. 492), composed entirely of sili- 
ceous sand-grains, is one of the most 
iy) Ge IRAP characteristic forms of the deeper-water 
sorum. 5. (Brady.) rhizopods of the Caribbean, Gulf of 
