304 Mr. F. Chapman on Foraminifera 



end. F. Cordai, Reuss *, is near to F. striga in its general 

 outline, but it bears no double riblet on the shell-surface. 

 These vertical costula? are comparable with the same struc- 

 tures forming a marked feature in F. Fritschi, Perner f- 

 The latter species, however, belongs to the group with much 

 elongated tests, and I have never met with any intermediate 

 and broader specimens of F. Fritschi than those figured in 

 the paper dealing with the Frondicularke from the Gault of 

 Folkestone under the name of F. pinnceformis {=F. Fritschi, 

 Perner \) . 



The specimens recorded by G. R. Vine from the Cambridge 

 Greensand as " Frondicularia, var. with two parallel longi- 

 tudinal ribs/' may either belong to this present species or to 

 F. Fritschi. 



Three specimens of F. striga with fairly constant characters, 

 but all slightly broken, were found in the Cambridge Green- 

 sand of Svvaff ham. 



Frondicularia Archiaciana, d'Orbigny. 



Frondicularia Archiaciana, d'Orbigny, 1840, Mem. Soc. geol. France, 

 vol. iv. p. 20, pi. i. figs. 34-36; Reuss, 1845, Verstein. buhm. 

 Kreidef. pt. i. p. 31, pi. xiii. fig. 29 ; Chapman, 1894, Journ. R. 

 Micr. Soc. p. 155, pi. iii. fig. 0. 



A broken specimen was found at Swaffham which bears 

 vertical stria? on its lateral surfaces similar to those found in 

 the Gault of Folkestone and the Chalk of Bohemia. 



Flabellina, d'Orbigny [1826]. 

 Flabellina didyma (Berthelin). 



Frondicularia didyma, Berthelin, 1880, M<5m. Soc. geol. France, ser. 3, 



vol. i. no. 5, p. 61, pi. ii. figs. 18 a, b. 

 Flabellina didyma (Berthelin), Chapman, 1894, Jonrn. B. Micr. Soc. 



p. 159, pi. iv. fig. 7. 



One specimen from Swaffham. 



Rhabdogonium, Reuss [I860]. 



Rhabdogonium excavatum, Reuss. 



Bhabdogonium excavatum, Reuss, 1862, Sitzungsb. d. k. Ak Wiss. 

 "Wien, vol. xlvi. p. 91, pi. xii. fig. 8 ; Chapman, 1894, Journ. R. Micr. 

 Soc. p. 160, pi. iv. figs. 9 a, b. 



* Verstein. bohm. Kreidef. 1845, pt. i. p. 31, pi. viii. figs. 26-28, 

 pi. xiii. fig. 41. 



t " Foraminifery Ceskeho Cenomanu " (Pal. Bohemia?, no. 1), 1892, 

 p. 58, pi. vii. figs. 1 a-d. 



% Journ. R. Micr. Soc. 1894, p. 156, pi. iii. figs. 9-11. 



