54 



Mr. F. Chapman on Foraminifera 



Placop&ilina vesicularis, Brady. 



Placopsilina vesicularis, Brady, 1879, Quart. Journ. Micr. Sci. vol. xix. 

 n. s. p. 51, pi. v. fig. 2 ; Chapman, 1892, Journ. R. Micr. Soc. p. 325, 

 pi. vi. tig. 5. 



This rudimentary form was formerly recorded as a fossil 

 from the Gault of Folkestone only. Several examples were 

 found in the Cambridge Greensand of Swaffham, attached to 

 fragments of glauconite. 



\Lahyrinthic forms.] 

 Haplostiche, Reuss [1861], 



Haplostiche Sherbonriana, Chapman. 



Haplostiche Sherborniana, Chapman, 1892, Journ. R. Micr. Soc. p. 325, 

 pi. vi. figs. 6-8. 



This species was originally described from zone xii. of the 

 Gault of Folkestone. 



Several specimens were found at Swaffham. 



Lituola, Lamarck [1804]. 

 Lituola placentulcij sp. n. (Figs. 2 a & b.) 



Test complanate, fairly thin in proportion to its width, 

 composed of coarse arenaceous material. The surface of the 

 test usually bears some slight indication of a spiral plan of 

 growth and a shallow umbilical depression. In section the 

 test has no definite chambered structure, but is perforated 



Fig. 2. 



Lituola placentula, sp. n. 

 i, side view ; b, edge view. X 22. 



irregularly, as is usual in the forms with labyrinthic tests. 

 Any regularity which might exist is obscured by the coarse- 

 ness of the material used in the construction of the test. In 



