. The testimony of the rocks; . MUREX ALVEOLATCS. ASTAETE OMALII. (Bed Crag.) group which still exists in our seas. Save in a few localdeposits, fishes do not form the prevailing organisms in theformations of the age of fishes; nor reptiles in the forma-tions of the age of reptiles; nor yet mammals in the for-mations of the age of mammals. Nay, it is not improbablethat the recent or human period may be marked mostprominently in the future, Avhen it comes to exist simply asa geologic system, by a still humbler organism than mostof these molluscs. On almost all rocky shores a line ofpale gray ma
. The testimony of the rocks; . MUREX ALVEOLATCS. ASTAETE OMALII. (Bed Crag.) group which still exists in our seas. Save in a few localdeposits, fishes do not form the prevailing organisms in theformations of the age of fishes; nor reptiles in the forma-tions of the age of reptiles; nor yet mammals in the for-mations of the age of mammals. Nay, it is not improbablethat the recent or human period may be marked mostprominently in the future, Avhen it comes to exist simply asa geologic system, by a still humbler organism than mostof these molluscs. On almost all rocky shores a line ofpale gray may be seen at low water, running for mile aftermile along the belt that has been laid bare at the bases ofthe cliffs by the fall of the tide. It owes its pale colorto millions of millions of a small balanus {B. balanoides),produced in such amazing abundance in the littoral zone asto cover with a rough crust every minute portion of rockand every sedentary shell. Other species of the samegenus {B. crenatus and B. 2)orcatus) occupy
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