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of Dr Brady ^ four of these have, however, been found in still older 
formations : viz. Psammophcera fusca, Hyperammina ramosa, Thuram- 
mina papillata occur in the Jurassic rocks of Switzerland, and Poly- 
morphina compressa in the Lias of England. 
Of the remaining forty-two species all but five occur in the Gault as 
well as in the Chalk, and all except six are living at the present day. 
Reophax guttifera is recorded by Dr Brady as an exceedingly rare 
species ; he describes the test as closely arenaceous : in the two specimens 
found in B 4 the test is built mainly of sponge spicules. Another species, 
which unfortunately cannot be identified, has used minute spicules felted 
together to form a smooth, nearly spherical test. Mr Earland tells me that 
Reophax guttifera is not uncommon in certain parts of the cold area of the 
Faroe Channel. He further remarks, “The Ammodisci are very large and 
fine, larger than any I have seen in the living state. They are like some 
specimens I have from Oceanic beds of Naparima, Trinidad.” The Lagena 
Orhignyana “is a typical deep-water specimen; such a wide delicate wing 
is never seen in those from shallow water.” With regard to Nonionina, 
Dr Brady f in a footnote refers to the memoir by Reuss on the classifica- 
tion of the Foraminifera. Reuss states the geological range of this genus 
as the Silurian formation (?), the Carboniferous limestone, and from the 
Chalk forwards. Dr Brady remarks that those from the Chalk were 
probably Pullenia which were included by D’Orbigny, and at that time by 
Reuss also in the genus Nonionina. At my request, Mr Earland re- 
examined these specimens and is quite satisfied that his determination 
is correct. 
The species recorded in the list have a deep-water facies. Trochammina 
trullissata, met with in twenty-five localities during the Challenger Expedi- 
tion, only five of which have depths less than 1500 fathoms. T. ringens, 
a rarer form, four times met with at depths not less than 1600 fathoms. 
Verneuilina g>ygnicea, met with in forty-two localities, fourteen of which 
were above 2000 fathoms, and only eight at less than 1000 fathoms. 
Pleurostomella subnodosa, nowhere less than 1375 fathoms. Truncatulina 
pygmea, nowhere less than 1450 fathoms. Rotalia Soldanii, out of 
sixty localities, six only have a depth of 300 fathoms, thirty-nine above 
1000 fathoms, and twelve over 2000 fathoms. Of Nonionina pompilioides 
Dr Brady remarks, “It is an exclusively deep-water Foraminifer; it occurs 
in all oceans at depths varying from 1000 to 2750 fathoms.” Truncatulina 
wuellerstorfi, “ a common constituent of deep-water ooze.” Seven other 
* “ Challenger ” Reports, vol. ix. 
t Ihid., vol. ix, p. 725. 
