38 
(Dana's Manual series), by a very fine individual. In the Creta- 
ceous of New Jersey, Case p, Sect. I, and in the Tertiary, there 
are very many fine representatives of several genera ; also in the 
European case, under the same formation. 
SUB-KINGDOM MOLLUSCA. 
SECTION MOLLUSCOIDEA. 
The Molluscoids are represented among fossils by two classes, 
Brachiopoda and Bryozoa. The former are shell-bearing, while 
the latter are compound animals of various forms, but secreting a 
calcareous or horny base which supports the colony. 
BRYOZOA (Moss animals). 
These objects are rather inconspicuous as fossils, to the naked 
eye, but under a magnifying glass show features of remarkable 
beauty. They are also compound in structure, forming colonies 
the basis of which are the structures obtained as fossils. They are 
largely parasitic and incrusting, forming thin films of a net-like 
structure on other fossil bodies. Some form expanded frond-like 
structures of a calcareous net work, filled with pores, each of 
which was the home of a separate individual of the colony. Others 
again form branching structures, resembling coral, and have 
usually been considered as such ; the surface being covered with 
the minute pores, often arranged in patterns and rising into 
tubercles. The cuts on the following page will afford some idea 
of some of their forms. 
