of the Lower Malm of Aargau. 535) 
irregularly arranged convolutions, and in being almost invari- 
ably filled up with a black ferruginous compound, which is often 
found also in 7. gordialis (Pl. III. fig. 18), while the shells 
of T. incerta reg., in spite of the wider aperture, are, as a rule, 
empty. ‘The presence of this substance seems to be charac- 
teristic, as specimens from the Randen (Canton Schaffhausen), 
and even from older formations, contain it. It is perhaps 
due to a different chemical composition of the sarcode. 
In a few instances the convolutions are partly embracing ; 
but in others they hardly touch each other. According to the 
different mode of growth, the aperture is rounded, sometimes 
margined or crescentic. Forms resembling those figured pl. ii. 
figs. 10-14 in Brady’s monograph of Carboniferous and Per- 
mian Foraminifera may be considered typical. 
Distribution. In the lower and middle beds of the trans- 
versartus-zone with TJ. incerta yeg., but also in the upper 
strata of the Argovian and in the Sequanian. 
Trochammina gordialis, J. & P.* 
(Pls. IIL. & IV. figs. 8-20.) 
This species comprises a large number of different forms, 
consisting of a free, irregularly convoluted test, forming in 
its earlier stage a regular elevated conical spiral, to which 
the younger part, chiefly the last convolution, is attached in 
various manners. Width of the tube almost invariable; con- 
volutions few, occasionally partly embracing ; aperture large, 
sometimes margined, in other cases small, at the constricted 
end of the chamber. 
Shell composed of numerous minute grains of sand imbedded 
in a colourless or brownish cement. 
Specimens with septate tubes, as described by Jones and 
Parker, from the Indian and Arctic seas, appear to be wanting 
in the Upper Jurassic formation. As a rule this variety 
differs little from the TZ. gordialis of other formations; for 
instance, the 7. proteus, Karrert, fig. 3, from the Vienna 
basin, or those from the Permian f. 
Kiibler and Zwingli§ describe as Cornuspira variabilis speci- 
mens from the Argovian II. (zone of Terebratula impressa), 
* Jones & Parker, Quart. Journ. Geol. Soc. vol. xvi. p. 804; Carpenter, 
Introd. Foram. p. 141, pl. xi. fig. 4. 
+ Karrer, “Ueber das Auftreten &c.,” Sitzungsber. k. Akad. Wien, 
vol. lii. p. 494, fig, 4. 
t Jones, Parker, & Kirkby, Ann. & Mag. Nat. Hist. ser. 4, vol. iy. 
p. 390, pl. xiii. 
§ Kubler & Zwingli, /, c. p. 33, pl. iy. fig. 4. 
