CHARACTERISTIC DEEP-SEA TYPES. RHIZOPODS. 165 



501, 501 a), with its smooth surface covered with fine pores. 



Fig. 501. Textularia trochus. f . (Goes.) Fig. 501 a. 



Valvulina triangularis (Figs. 502, 502 a), a North Atlantic 



Fig. 502. Valvulina triangularis. .|. (Goes.) 



Fig. 502 a. 



foraminifer, is also one of the typical West Indian rhizopods ; 

 it is characterized by its loosely constructed test. 



The Lagenidse are a most widely distributed type ; accord- 

 ing 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 

 2 i' common species, Lagena distoma, is 



.here figured. (Fig. 503.) 



