Transactions of the Society. 
deposits ; and it appears worthy of being retained, under the above 
name, for its value as a Cretaceous form. 
Examples have been figured by Berthelin under the name of 
G. ingenua, which are apparently inseparable from Beuss’ type, 
although the earlier figure given by Beuss is not quite so typical 
as might be desired. 
The specimens from the French Gault are more compressed than 
that figured by Reuss, but the difference is not sufficiently marked 
amongst a number of specimens to warrant the retention of both 
names. 
The example here figured from the Gault of Folkestone does not 
show the slight umbilical depression usually seen, but that feature is 
not wanting in many of the Folkestone-Gault specimens. 
As regards the Lower Cretaceous of Germany, G. turgidula has 
been recorded from the Milletianus-d&y near Peine, and in the 
Minimus-day near Sohlde between Peine and Salzgitter (Beuss). In 
France it was found in the Gault of Montcley (Berthelin). 
G. turgidula was found at Folkestone in zone iii., very rare ; 
zone iv., very rare; zone xi., 40 ft. from the top, very rare; 6 ft., 
frequent. 
Gristellaria circumcidanea Berthelin, plate I. fig. 2 a, b. 
G. circumcidanea Berthelin, 1880, Mem. Soc. geol. France, ser. 3, 
vol. i. No. 5, p. 52, plate iii. fig 1 a, b. 
The peripheral edge of the test of G. circumcidanea is sub- 
angulate, and flattened into a narrow but tolerably sharp keel. The 
sutural margin of each chamber in succession slightly overlaps the 
preceding, thus giving an illusive appearance of sutural limbation or 
shell thickening. This latter feature may cause it to be confounded 
at first sight with G. subalata, in which the sutures are actually 
Plate II. 
Fig. 1. — Gristellaria sternalis Berthelin : a, lateral aspect ; b, front peripheral aspect 
X 23. 
„ 2. — C. diademata Berthelin : a, lateral aspect ; b , front peripheral aspect, 
x 20. 
„ 3 . — Polymorpliina lactea Walker and Jacob sp. : b, aboral end. x 30. 
„ 4. — P. lactea, fistulose form, x 45. 
„ 5. — P. gibba d’Orbiguy : b, transverse sectional view, x 60. 
„ 6. — P. gibba , , fistulose form ; b, oral aspect, x 45. 
„ 7. — P. gutta d’Orbigny : 6, transverse sectional view, x 60. 
„ 8. — P. gutta , fistulose form, x 45. 
,, 9. — P.fusiformis Roeraer sp. : b, transverse sectional view, x 45. 
„ 10. — P. fusiformis, fistulose form, x 45. 
„ 11. — P. sororia Reuss : b, oral aspect, x 60. 
„ 12. — P. sororia , fistulose form x 50. 
„ 13. — P. sororia var. cuspidatci Brady. X 45. 
„ 14. — P. angusta Egger. X 60. 
„ 15. — P. communis d’Orbigny. x 45. 
„ 1 6. — P. compressa d’Orbigny : b , transverse sectional view, x 45. 
