CHARACTEKISTIC DEEP-SEA TYPES. RIIIZOPODS. 165 



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



Fig. 501. 



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



Valmdliia tricmgularis (Figs. 502, 502 a), a North Atlantic 



Valviilina triangularis. 8 (Goes, 



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. .50.3. —Lagena distoma. region to 3,000 fatlioms. One of the 

 Y. (Brady.) commou spccics, Lagenci distoma, is 



here figured. (Fig. 503.) 



