308 NATURAL SCIENCE [November 
In this clay there is a fair quantity of minute glauconite grains, 
found only in the finest washings. The foraminifera yield evidence 
of slightly shallower conditions than the preceding, which, however, 
is probably placed at too great an estimation, since the foraminifera 
obtained from the green-sand seam, as previously pointed out, are not 
numerous enough to be representative, 
The depth for this deposit is 700 fathoms. For comparison, one 
may refer, as a typical green mud of similar depth, to ‘ Challenger, 
Station No. 163 F., off Sydney, depth 650 fathoms. 
Zone II,—The samples taken from this zone were clays of a 
dark green colour. 
The residua yielded a fair quantity of glauconite, and the pre- 
sumably pelagic Globigerina cretacea was met with in some frequency. 
In their general character these clays are comparable with the green 
muds. 
The depth of these samples works out at 820 fathoms. 
Zone III—The clay of this zone is of a pale brown or fawn 
colour, and is quite distinct in appearance from the rest of the Gault. 
Glauconite is extremely rare, and appears to be entirely absent in 
the modern red muds, with which this clay may perhaps be com- 
pared. The comparison, however, is not much more than one of 
similarity of colouration in its present condition, for much of the 
colour in modern red muds is due to ochreous matter, whilst that of 
the Gault of this zone is due to carbonate of iron with some ochre- 
ous staining. It is, however, not very probable that it could have 
originally been a blue mud, since this would have resulted, as with 
some other samples of the Gault, in the infilling of the foraminiferal 
shells with pyrites instead of carbonate of iron, of which we here 
have evidence. This carbonate of iron is found in some quantity 
disseminated through the clay as minute casts of organisms; and 
there are alsc concretionary bands of the same material running 
through the bed. This concretionary iron band is perforated 
throughout with what are apparently annelid borings, and this has 
been noticed by Mr Hilton Price (5), who drew attention to it in 
1876 in connection with a similar annelid bed which Professor 
Rupert Jones had described (3) from Westwell Leacon in Kent, and 
locally known as ‘ Harper. This bed Professor Jones found in the 
“upper part of the lowest third of the Gault” at that locality ; and 
he compared it with a bluish-grey mud with annelids found forty 
miles S.E. of No-Sima Lighthouse, Japan, at a depth of 1875 
fathoms. Professor Jones has been good enough to give me a speci- 
men of the annelid rock from Westwell Leacon, and I find it com- 
parable with a similar bed which I found some years ago in the 
Gault at Godstone. All three specimens probably occur at about 
the same horizon of the Gault and are equivalent to Zone III. at 
