CHARACTERISTIC DEEP-SEA TYPES. — RHIZOPODs. 165 
501, 501 a), with its smooth surface covered with fine pores. 
Fig. 501. Textularia trochus. 8. (Goés.) Fig. 501 a. 
Valvulina triangularis (Figs. 502, 502 a), a North Atlantic 
Fig. 502. Valvulina triangularis. $, (Go8s.) Fig. 502 a. 
foraminifer, is also one of the typical West Indian rhizopods ; 
it is characterized by its loosely constructed test. 
The Lagenide are a most widely distributed type; accord- 
img to Brady, they are found in all 
seas, at all depths from the littoral 
Fig. 503. — Lagena distoma. region to 3,000 fathoms. One of the 
Ara MP common species, Lagena distoma, is 
here figured. (Fig. 503.) 
