58 Mr. F. Chapman on Foraminifera 



Tritaxia pi/ramidata, Reuss. 



Tritaxin pi/ramidafa, Reuss, 1862, Sitzungsb. d. k. Ak. Wiss. Wien, 

 vol. xlvi'. p. 32, pi. i. fif^3. 9rt-c; Chapman, 1892, Journ. R. .Micr. 

 Soc. p. 750, pi. X. figs. '2 a & b. 



This form in the Soutli of England i.s cliiefly 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 [1841]. 



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



Textularia annectens, Parker and Jones, 1803, Ann. & 5lag. Xat. 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. 3 rt & 6. 



Four specimens of this interesting foraminiferon were 

 found in the Cambridge Greensand of Swaffham, two of 



FJff. 4. 



Spiroplecta anneitemf (P. & J.). Specimen with uniserial 

 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'Orbigiiy [1840]. 



Qaudryina Jiliformis^ Berthelin. 



Gaudryina Jiiiformis, Berthelin, 1880, M^m. Soc. geol. France, S(5r. 3, 

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

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



This species is well developed and frequent at fSwafi'liam. 



