from the " Cambridge Cfreensand." 61 



A few specimens were found at Swaffham. It also 

 occurred in Gr. R. Vine's washings from Cambridge. 



Bulimina brevis, d'Orbigny. 



Bulimina brevis, d'Orbigny, 1840, Mem. Soc. ge*ol. France, vol. iv. p. 41, 

 pi. iv. figs. 13, 14; Chapman, 1892, Journ. R. Micr. Soc. p. 756, 

 pi. xii. fig. 8. 



A fairly common species at Swaffham. 



Bulimina affinis, d'Orbigny. 



Bulimina affinis, d'Orbigny, 1839, Foram. Cuba, p. 109, pi. ii. figs. 25, 

 26 ; Chapman, 1892, Journ. R. Micr. Soc. p. 756, pi. xii. figs. 10 a 

 &b. 



This form appears, from the series obtained, to graduate by 

 the elongation of the test into B. Orbignyi. 

 Common at Swaffham. 



Pleurostomella, Reuss [1860] . 



Pleurostomella obtusa, Berthelin. 



Pleurostomella obtasa, Berthelin, 1880, Me"m. Soc. geol. France, s6r. 3, 

 vol. i. no. 5, p. 29, pi. i. figs. 9 a & b ; Chapman, 1892, Journ. R. 

 Micr. Soc. p. 757, pi. xii. figs. 13 a & b. 



This species is well developed and very common in the 

 Cambridge Greensand of Swaffham. 



Pleurostomella alternans, Schwager. 



Pleitrosto?neUa alterna?is, Schwager, 1866, Novara-Exped. geol. Theil, 

 vol. ii. p. 238, pi. vi. figs. 79, 80 ; Chapman, 1892, Journ. R. Micr. 

 Soc. p. 758, pi. xii. figs. 14 a & b. 



By the fact of the association of the preceding form with 

 P. alternans, and also that the former has a megalospheric 

 commencement succeeded by few chambers, whilst the latter 

 is microspheric with numerous chambers, one is disposed to 

 think that we have in these two so-called species the two 

 generations of a single species. 



P. alternans is frequent at Swaffham. 



Family Lagenidae. 



Subfamily Laqeninm. 



Lagena, Walker and Boys [1784]. 



Lagena apiculata, Reuss. 



Lagena apiculata, Reuss, 1862, Sitzungsb. d. k. Ak. Wiss. Wien, 

 vol, xlvi. p. 319, pi. i. figs. 4-8,10,11; Burrows, Sherborn, and 



