CHARACTERISTIC DEEP-SEA TYPES. — CRUSTACEA. 51 
uncommon West Indian type from the globigerina ooze: it be- 
longs to the group having no peduncle. 
As has been noticed by Hoek, the presence of Scalpellum and 
Verruca in the great depths of the ocean coincides in a strik- 
ing manner with the paleontological history of these genera. 
They are found in the secondary deposits, yet the genus Pol- 
licipes, another of the pedunculated cirripeds, dating back to the 
oölite, is only a littoral genus in our seas. 
The ostracods are minute crustaceans, the-dead tests of which 
occur in nearly all the bottom deposits. They are very abundant 
fossils, but the deep-sea dredgings have not as yet revealed 
any type of im- 
portance. Many of 
the ostracods (Fig. 
259) are pelagie; 
only a compara- 
tively small num- 
ber live at any 
considerable depth; they are denizens of shallow water or of 
moderate depths. 
Fig. 259. — Cypris. Greatly magmified. 
