ARCHEAN AND PALEOZOIC LIFE 419 
Carboniferous Life. — Nothing new is noticed, in a 
large way, concerning the marine invertebrate life of 
the Carboniferous time, though the trilobites and 
brachiopods continued to decrease. A rather remark- 
able development of those beautiful creatures, the 
Fic. 240. 
A group of Carboniferous fossils. 1, 3, 4, 6, 7, and 8, brachiopods; 2, bivalve 
mollusk; 5, cephalopod. 
(1, Spirifer neglectus; 2, Inoceramus pseudomytiloides; 3, Spirifer forbesi; 
4, Spirifer grimesi; 5, Nautilus; 6, Productus semireticulatus; 7, Spirifer 
logani; 8, Rhynchonella acuminata.) 
sea-lilies, or crinoids, is noticed in the earlier part of 
this period (Fig. 241 and Plate 19). After this time 
they began to decline, until at present very few species 
are left in the ocean. The fishes were similar to those 
of the Devonian time. 
