142 THE FOEAMINIFEEA 



secondary septa. Sometimes measures as much as 

 y'o inch (7 "5 mm.) 



This striking form is frequently found in dredgings 

 from the West Indies and the Pacific, among other 

 locahties. It ranges in depth from about 40 to 

 435 fathoms. As a fossil it first occurs in the Mio- 

 cene. Miocene to Becent. (Plate 7, figs. H, li.) 



Genus Litiiola, Lamaeck. 



Test free, partially or entirely spiral ; nautiloid or 

 crozier-shaped. Garhoniferous to Becent. 



Example. — L. placentulci, Chapman, ' Ann. Mag. 

 Nat. Hist.' ser. 7, vol. iii. 1899, p. 54, figs. 2a, h. 



Test complanate, irregularly suhoval ; composed 

 of coarse arenaceous particles with much cement of 

 a finer sandy nature. Interior labyrinthic. The 

 general aspect of the test shows this form to have 

 had a spiral, but the separate segments are obscure. 

 Cretaceous (Camhridge Greensand). (Plate 7, fig. I.) 



Genus BdeUoidina, Cartee. 



Test adherent ; chambers linear, vermiform, ap- 

 proximated, intercommunicating by a row of pores 

 seen on each septal face. Gretaceous, Becent. 



Example. — B. aggregata, Carter, ' Ann. Mag. Nat. 

 Hist.' ser. 4, vol. xix. 1877, p. 201, pi. xiii. figs. 1-8. 



This is apparently the only species of the above 

 genus. The test is generally constructed of coarse 

 calcareous sand, the exterior of the shell being rough, 

 the internal surface smooth. With the exception of 

 •one fine example met with in the Chalk this form is 



