from the " Cambridge Greensanciy 305 



In the Gault this species appears to be confined to the 

 uppermost zones. It is somewliat frequent at Swaffham. 



Rhahdogonium excavatiim, Reuss, var. exilis, nov. 

 (Fig. 2.) 



This variety is distinguished from the typical R. excavatum 

 by the elongate form and extreme tenuity of its test. The 

 primordial segment is separated from the rest of the shell by 



Fiff. 2. 



V 



Rhabdogonium excavatum, Reuss, var. exilis, nov. X 30. 

 a, lateral view ; b, oral aspect. 



a conspicuous constriction. Length -9 millim. ; breadth at 

 the widest part of the oral extremity -3 millim. 



The figured specimen was obtained from the Cambridge 

 Greensand of S waff ham. 



Marginulina, d'Orbigny [1826]. 



MarginuUna glabra, d'Orbigny. 



Marginulina glabra, d'Orbigny, 1826, Ann. Sci. Nat. vol. vii. p. 259, 

 no. 6 ; Modele, no. 55 ; Chapman, 1894, Journ. R. Micr. Soc. p. 160, 

 pi iv. figs. 11 a, b. 



Two specimens from the Greensand of SwaflPham. 



Marginulina hamulus, Chapman. 



Marginulina kajHulus, Ch.si.T^m.Sin, 1894, Journ. R. 3Iicr. Soc. p. 161, 

 pi. iv. figs. 13 a, b. 



Two specimens, in both of which the test does not so 

 rapidly increase in size as the specimens figured from the 

 Folkestone Gault, were found at SwafFham. 



Marginulina linearis, Reuss. 



Ma}-giniilina linearis, Reuss, 1862, Sitzungsb. d. k. Ak. Wiss. "NVien, 

 vol. xlvi. p. 60, pi V. fig. 15 ; Chapman, 1694, Journ. R. Micr. Soc. 

 p. 161, pi. i v. tig. 14. 



Rare at Swaffham. 

 Ann. JL- Mag. N. Hist. Ser. 7. Vol iii. 23 



