14 Transactions of the Society. 
Sherborn, and Bailey, 1890, Journ. Boy. Micr. Soc., p. 561, plate xi. 
fig. 13. 
This well-known form has keen recorded from the Lias of York- 
shire (Blake) ; from the Neocomian beds of Guildford (Chapman) ; 
from the Gault of Montcley (as P. cretacea Berthelin) ; from the 
Bed Chalk of Speeton (as P. gibba Burrows, Sherborn, and Bailey) ; 
and from many beds of Upper Cretaceous and Tertiary ages. The 
greatest depths for its occurrence in recent deposits is 155 fathoms. 
P. communis occurs in the Gault in zone xi., 45 ft., from the top, 
very rare ; 6 ft., frequent. 
Polymorphina compressa d’Orbigny, plate II. fig. 16. 
Polymorphina compressa d’Orbigny, 1846, Foram. Foss. Vien., 
p. 233, plate xii. figs. 32-4. Brady, Parker, and Jones, 1870, 
Trans. Linn. Soc. Lond., vol. xxvii. p. 227, plate xl. fig. 12 a-f. 
Brady, 1884, Chall. Bep., vol. ix. p. 565, plate lxxii. figs. 9-11. 
P. communis Burrows, Sherborn, and Bailey, 1890, Journ. Roy. 
Micr. Soc., p. 561, plate xi. fig. 11. 
This species somewhat resembles the longer forms of P< lactea , 
but is easily distinguished by the compressed form of its test. 
Its geological range is extensive, it being recorded from the Lias 
and occurring in all of the more important fossiliferous strata of 
the Cretaceous and Tertiary systems. It is found in shallow- water 
deposits at the present day. 
P. compressa was found at Folkestone in zone xi., 50 ft. from the 
top, rare : 45 ft., very rare. 
