58 



Mr. F. Chapman on Foraminifera 



Tritaxia pyramidata, Reuss, 1862, Sitzungsb. d. k. Ak. Wish. Wien, 

 vol. xlvi. p. 32, pi. i. figs. 9 a-c ; Chapman, 1892, Journ. R. Micr. 

 Soc. p. 750, pi. x. figs. 2 a & b. 



This form in the South of England is chiefly confined to 

 the Upper Gault and Chalk-marl. It has also been found in 

 the Gault of France and Germany. 



At Swaffham this species is somewhat frequent. 



Spiroplecta, Ehrenberg [1844]. 



Spiroplecta annectens (Parker and Jones). (Fig. 4.) 



Textularia annectens, Parker and Jones, 1863, Ann. & Mag. Nat. Hist, 



ser. 3, vol. xi. p. 92, woodcut, fig. 1. 

 Spiroplecta annectens (P. & J.), Chapman, 1892, Journ. R. Micr. Soc. 



pp. 750, 751, pi. xi. figs. Sa &b. 



Four specimens of this interesting foraminiferon were 

 found in the Cambridge Greensand of Swaffham, two of 



Kar. 4. 



Spiroplecta annectens (P. & J.). Specimen with uuiserial 

 outgrowth. X 30. 



which (see fig. 4) show the trimorphous development of the 

 test, being at first spiral, then biserial, and finally uniserial. 



GAUDRYINA, d'Orbigny [1840]. 

 Gaudri/ina Jiliformis, Berthelin. 



Gavdryina jiliformis, Bertheliu, 1880, Mem. Soc. geol. France, ser. 3, 

 vol. i. no. 5, p. 25, pi. i. fig. 8; Chapman, 1892, Journ. R. Micr. Soc. 

 p. 752, pi. xi. fig. 7. 



This species is well developed and frequent at Swaffham. 



