Brackishewater Foraminifera. 293 
fossil. It is described and figured in the ‘ Monograph of the 
Crag F inifera,’ p. 45, pl. 1. figs. 36, 37, where a suc- 
cinct account of its peculiarities and distribution may be 
fo tis, morphologically speaking, the distomatous va- 
riety of Lagena levis. 
Lagena gracillima is frequently met with in Northumbrian 
estuaries. In the Fen district it has only been noticed at one 
point, Breydon Water. It also occurs in two localities far 
apart, but similar in tidal relations, viz. Montrose Basin and 
Westport, Ireland, 
Lagena globosa, Montagu, sp. . 
Vermiculum globosum, Montagu (1803), Testacea Britannica, p. 523. 
Not uncommon in river-estuaries where there is sufficient 
admixture of sea-water; sparingly found in most of the Fen 
gatherings. 
Lagena striata, D'Orbigny, sp. 
icu ines, D'Orbigny (1859), Foram. Amér. Mérid. p. 21, pl. 5. 
g. 12. 
In the Northumbrian estuaries and Montrose Basin ; one or 
two specimens also from the mouth of the Ribble. 
Lagena semistriata, Williamson. 
Lagena striata, var. B. semistriata, Williamson (1848), Ann. & Mag. Nat. 
Hist. ser. 2. vol. i. p. 14, pl. 1. figs. 9, 10. 
Less frequent than Z. striata in estuaries, but found in 
some Fen localities, where the latter species has not been ob- 
served at all, viz. dykes on the site of Whittlesea Mere, 
Somerton Broad, and Breydon Water. 
Lagena distoma, Parker & Jones. 
Lagena sulcata, var. distoma, Parker & Jones (1864), Phil. Trans. vol. cly. 
p 356, pl. 13. fig. 20, i 
Somewhat common in the Northumbrian estuaries and in 
the Montrose Basin. i 
This is one of the species that seems to have died out of the 
fen-waters as the proportion of saline constituents has dimi- 
nished; for it is of frequent occurrence, amongst other scarcely 
fossilized Foraminifera, in the clay underlying the peat as far 
inland as Peterboro’ (Parker). 
Lagena marginata, Walker & Jacob, sp. 
—— (Lagena) marginata, Walker & Jacob (1784), Test. Min. p. 3, pl. 1. 
g. 7. 
Found in exactly the same gatherings as L. distoma, Con- 
