DISTRIBUTION TABLES. 
TABLE I.— COMPARATIVE VIEW OF THE FORAMINIFERA OF 
VARIOUS MARINE DEPOSITS. 
The following Table affords a means of comparison of the general aspects of the 
Foraminiferal fauna of the more important oceanic deposits met with during the Challenger 
cruise. The names employed for the deposits are those made use of by Messrs. Murray 
and Renard in their researches on the chemical and physical characters of the sea-bottom. 
Some of them, such as Globigerina Ooze, Pteropod Ooze, Red Clay, and Diatom Ooze, 
have already been explained (p. 79); of the others, which have been more recently 
introduced, definitions are given below. The fauna of Grey Ooze or Grey Mud is practi- 
cally identical with that of Globigerina Ooze, and Radiolaria Ooze contains as a rule 
the same species of Foraminifera as Red Clay ; these, therefore, have been omitted from 
the Table. 
Green Sand. — A deposit found near continental land, owes its green colour to grains 
of glauconite, isolated or united into concretions. The Foraminifera and other organisms 
are frequently filled with glauconitic substance, and casts of these remain after treatment 
with acid. Mineral particles derived from the neighbouring continents are also present. 
Green Mud. — A deposit found under similar conditions to Green Sand, but in deeper 
water, contains similar mineral particles, but with a larger proportion of argillaceous and 
other amorphous matter. 
Blue Mud. — The most extensive deposit now forming around continents and conti- 
nental islands, and in enclosed and partially enclosed seas. There is generally a thin 
layer of a reddish hue on the surface. The blue colour is due to organic matter in a state 
of decomposition. The principal portion is composed of mineral particles derived from the 
disintegration of the neighbouring lands. 
Red Mud. — A deposit met with by the Challenger only off the coast of Brazil ; differ- 
ing from Blue Mud in the presence of a quantity of ochreous matter which is brought 
down by the rivers and deposited along the coast. 
