Foraminifera of the Gault of Folkestone. By F. Chapman. 585 
examples from the Cretaceous and the Jurassic series. Berthelin * 
also mentions some specimens from the Gault of France, possibly 
identical with B. cervieornis, which he compares with Terquem’s 
figures ; and he refers to them under the name of Wehbina irregularis 
d’Orbigny. 
In connection with the above species, it is also interesting to note 
that Dr. Perner has figured f a specimen from the Cenomanian strata 
of Bohemia, under the name of Trochammina irregularis ( = Vitri- 
webbina tuberculata Sollas sp.) which shows a curious bifurcation of 
the terminal chamber, resulting in an antler-like ending, and remind- 
ing us of the extremities of the branches in B. cervieornis. 
The specimens of B. cervieornis are somewhat difficult to obtain 
from the Gault washings in anything like completeness, so that a 
large quantity of the clay was carefully washed, beyond the standard- 
sized piece from which all the other specimens were obtained, for the 
purpose of this present inquiry. 
Usually the test is much injured, but its outline can generally be 
traced on the object to which it was attached. The cavity of the 
test is often filled with pyrites, a common feature with many other 
species of the Foraminifera found in the Gault. 
B. cervieornis was found in zone iii., very rare ; zone vii., fre- 
quent ; zone x., frequent ; zone xi., 20 ft. from tho top, very rare. 
Vitriwebbina Chapman [1892]. 
For comparative notes on this genus and Webbina, see Ann. and 
Mag. Nat. Hist., ser. vi., vol. xviii. October 1896, pp. 326-33. 
Test adherent, consisting of a series of hemispherical or elliptical 
chambers, gradually increasing in size and usually arranged in a 
curve. The commencing segment sometimes exhibits a polymorphine 
septation. Shell finely perforate, translucent or dull. Surface of 
test smooth, dull, or tuberculate. Aperture, a simple crescentic slit 
at the termination of the last chamber at its junction with the surface 
of attachment. 
Yitriwebbina Isevis Sollas sp., plate XII. fig. 12. 
Webbina Isevis Sollas, 1877, Geol. Mag., Dec. II. vol. iv. pp. 103 
and 104, plate vi. figs. 1-3. Yitriwebbina Isevis Chapman, 1892, 
Geol. Mag., Dec. III. vol. viii. p. 53, plate ii. fig. 4. Bagg, 1895, 
Johns-Hopkins Univ. Circ., xv. No. 121, p. 12. Chapman, 1896, 
Ann. and Mag. Nat. Hist., vol. xviii. p. 332, fig. 3. 
The test is smooth, transparent, and glassy in texture. Segments 
usually hemispherical and closely conjoined ; numbering usually about 
three or four, but sometimes five in specimens from the Chalk for- 
mation. This species sometimes shows the polymorphine septation of 
the initial segment, as in the example herein figured. 
* Mem. Soc. Ge'ol. France, ser. 3, vol. i. No. 5, 1880, p. 20. 
t Oeska Ak. Cfsare Frantiska Josefa, Prague (Palceont. Bohemia)), No. 1, 1892, 
p. 53, pi. ix. fig. la. 
