Rhetic Foraminifera from Somerset. 319 
original description of the type forms. I have also found this 
form in the Upper Lias_clay of Northampton. 
The species might easily be mistaken for a minute sandy 
Quinqueloculine form ; but the tube is merely constricted at 
each turn by an infolding of the shell-wall, and is not truly 
septate. 
Found in bed no. 2 at Wedmore, common. 
13. Ammodiscus auricula, sp. n. 
(PIPE. figs) 18'a;'oH) 
Test free, ear-shaped, greatly compressed, consisting of a 
coiled tube, which is spuriously septate at intervals. The 
test sometimes exhibits a central inflated kidney-shaped 
pseudo-chamber. ‘The peripheral edge is usually thinner 
than the rest of the test, so that the margin is flange-like. 
Aperture a slit, situated vertically, on the lower edge of the 
termination of the compressed tube, at its junction with the 
previous whorl. ‘Test arenaceous, thin, and delicate. Length 
about 3/5 inch (0°63 millim.). 
This form is not common in the Rhetic washings, but 
several characteristic examples were found. Its nearest 
representative is A. Robertsoni, but it differs from that species 
in the peculiar shape and the extreme compression of the test. 
From the Rheetic, bed no. 2, Wedmore; frequent. 
14. Ammodiscus jurassicus, Heeusler. 
(Pl. XI. fig. 19.) 
Trochammina jurassica, Heeusler, 1882, Ann. & Mag. Nat. Hist. ser. 5, 
vol. x. p. 58, pl. iv. figs. 81-40 ; id. 1882, Neues Jahrb. f. Min. p. 59, 
pl. iv. fig. 4. 
Ammodiscus jurassicus, Heeusler, 1885, Neues Jahrb. f. Min., Beil. 
Bd. iv. p. 26, pl. iii. figs. 33,34; id. 1890, Abhandl. Schweiz. palzeon- 
togr. Gesellsch. vol. xvii. p. G1, pl. ix. figs, 44-47, 
This is not a common foraminifer in the Rheetic washings. 
Fairly typical examples were, however, met with at various 
horizons. Dr. Heeusler records A. jurassicus from the Upper 
Jurassic beds of Switzerland, and he also notes it from the 
Lower Cretaceous. 
This species was found in the Rheetic of Wedmore, in bed 
no. 2, rare; no. 5, frequent; no. 6, very rare. 
15. Ammodiscus fusiformis, sp. n. 
(Pl. XI. figs. 20 a, 0.) 
Test free, spindle-shaped, and sometimes curved; con- 
sisting of a tube sharply bent on itself at each end of the 
