202 THE FOEAMINIFERA 



chambers connected by long stoloniferous tubes. 

 Jurassic to B event. 



Example. — li. (jlohiilifera, Brady. 



This species, which may be taken as typical of 

 the free-gro^Ying forms, is distinguished by its 

 branching test, composed of irregular subgiobular 

 chambers, connected by slender curved or straight 

 stoloniferous tubes, and which radiate from the 

 chambers. Segments internally septate, but only in 

 an imperfect manner. Texture hyaline, finely per- 

 forate. Surface of test hispid or aculeate, but not 

 so coarsely as in the cretaceous species B. aciileata. 



B. glohiiliferd has been recorded as a fossil under 

 various names from the Middle Jurassic of Poland 

 and Switzerland, the Aptian beds of Surrey, the 

 Gault of France and England, and from various 

 Tertiary beds, as the London Clay, and the Pliocene 

 of Italy. It occurs at moderate depths in the seas 

 of the present day. Jurassic to Becent. (Plate 11, 

 fig. E.) 



Genus Vitritvebbina, Chapman. 



Test adherent, consisting of a series of hemi- 

 spherical or elliptical chambers, gradually increasing 

 in size and usually arranged in a curvilinear manner. 

 The commencing segment sometimes exhibits a poly- 

 morphine septation. Shell finely perforate, translu- 

 cent or dull. Surface of the test smooth or minutely 

 tuberculate. Aperture a simple crescentic space 

 situated between the inferior margin of the shell 



