CHARACTERISTIC DEEP-SEA TYPES. KH1ZOPODS. 



169 



walls, the greatest variety of forms and of deviation from the 

 parent type results. 



Pulmnulina auricula (Figs. 515, 515 a) is a handsome hya- 



Fig-. 515. 



Fig. 515 a. 



Pulviuulina auricula. 1 T 5 . (Goes.) 



Fig. 516. 

 Pulvinulina Menardii. 



Fig. 517. 

 2. (Goes. 



line species, and its ally, P. Menardii (Figs. 516, 517), is one 



of the most common deep-water species. It is also pelagic. 

 Another deep-water form is Truncatulina Un- 

 yeriana. (Fig. 518.) The little Potytrema 

 miniaceum (Fig. 519) is a delicate red parasitic 

 foraminifer, occurring 

 everywhere in the 

 West Indies, which 

 resembles certain mi- 

 nute corals. It has a 



long geological history, dating back 



to the devonian. Of the Nummuli- 



nidae, Polystomella crispa is one of 



the most abundant West Indian types p . g 519 _ Polytoniia 



of moderate depths. ceum. y 



Fig. 518. Trun- 

 catuliiia Ungeri- 

 (Goes.) 



ana. 



