Brackish-water Foraminifera. 297 
Cristellaria crepidula, Fichtel & Moll, sp. 
Nautilus crepidula, Fichtel & Moll (1803), Testacea Microscopica, p. 107, 
pl. 19. figs. g, i. , 
Very rare; represented only by isolated specimens from the 
Wansbeck and Blyth respectively. 
Polymorphina lactea, Walker & Jacob, sp. 
Serpula lactea, Walker & Jacob (Jide Kanmacher) (1798)  Adams's 
Essays, 2nd ed. p. 634, pl. 24. fig. 4. 
_ Each of these three species has been collected in two loca- 
lities ; but the occurrence of solitary specimens at a few points 
widely separated yields only the general indication of rarity. 
Polymorphina communis, D'Orbigny. 
Polymorphina (Guttulina) communis, D'Orbigny (1826), Ann. Sci. Nat. 
vol. vii. p. 226. no. 15, pl. 12. figs. 1-4, Modéle no. 62. 
Very rare. 
Polymorphina oblonga, Williamson. 
Polymorphina lactea, var. oblonga, Williamson (1858), Rec. For. Gt. Br. 
P- 71, pl. 6. figs. 149, 149a. : 
Very rare, 
Polymorphina compressa, D’Orbigny. 
Polymorphina compressa, D'Orbigny (1846), For. Foss. Vienne, p. 243, 
pl. 12. figs. 32-34, 
. The least-rare variety of the genus; yet even P. compressa 
1s almost confined to the more marine localities of the Table. 
n the Fen gatherings specimens referable to Polymorphina 
are almost completely absent, and but for a solitary instance 
supplied by the dykes on the site of Whittlesea Mere, Breydon 
ater would stand alone as a Fen habitat ; even here the 
Specimens found have been few and small. 
It is worthy of note that the closely allied group Nodosarina, 
which is found in one variety or other at every point on our 
Coast, is, so far as appears, entirely wanting amongst the re- 
cent microzoa of the fen-waters. 
Uvigerina irregularis, Brady. 
Uvigerina irregularis, H. B. Brady (1865), Nat. Hist. Trans. North. & 
Durham, vol. i. p. 100, pl. 12. fig. 5. 
The irregular Uvigerina with thin, smooth, porous shell is 
