CUARACTERISTIC DEEP-SEA TYPES. KHIZOPODS. 



169 



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

 parent type results. 



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



Fig-. 515. Fig. 515 a. 



Pulvinulina auricula. \^. (Goes.) 



Fig. 516. Fig. 517. 



Pulvinulina Menardii. \^. (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- 

 (jeriana. (Fig. 518.) The little PoJytrema 

 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 crisj^a is one of 



the most abundant West Indian types 



of moderate depths. 



Fig. 518. — Trun- 

 catulina Ungeri- 

 ana. ^^. (Goes.) 



Fig. 519. — Polytrema minia- 

 ceum. 



10 



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