from the " Cambridge Greensand." 305 



In the Gault this species appears to be confined to the 

 uppermost zones. It is somewhat frequent at S waff ham. 



Rhabdogonium excavatum, 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 



Fig. 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]. 

 Marginulina 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 Swaff ham. 



Marginulina hamulus, Chapman. 



Marginulina hamulus, Chapman, 1894, Journ. R. Micr. 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 8 waff ham. 



Marginulina linearis, Reuss. 



Marginulina linearis, Reuss, 1862, Sitzungsb. d. k. Ak. Wiss. Wien, 

 vol. xlvi. p. 60, pi. v. fig. 15 ; Chapman, 1894, Journ. R. Micr. Soc. 

 p. 161, pi. iv. fig. 14. 



Rare at Swaffliam. 



Ann. & Mag. N. Hist. Ser. 7. Vol. iii. 23 



