GLOSSARY Si9 



Asymmetrical. — Having the two sides unlike. 

 Atrophied. — Arrested in development at a very early stage. 



Balanus. — The genus including the common Acorn-shells 

 which live in abundance on the rocks of the sea-coast. 



Batrachians. — A class of animals allied to the Reptiles, 

 but undergoing a peculiar metamorphosis, in which the 

 young animal is generally aquatic and breathes by gills. 

 {Examples^ Frogs, Toads, and Newts.) 



Bowlders. — Large transported blocks of stone generally 

 imbedded in clays or gravels. 



Brachiopoda. — A class of marine Mollusca, or soft-bodied 

 animals, furnished with a bivalve shell, attached to 

 submarine objects by a stalk which passes through an 

 aperture in one of the valves, and furnished with fringed 

 arms, by the action of which food is carried to the 

 mouth. 



Branchi^. — ^Gills or organs for respiration in water. 



Branchial. — 'Pertaining to gills or branchiae. 



Cambrian System, — A Series of very ancient Paleozoic 

 rocks, between the Laurentian and the Silurian. Until 

 recently these were regarded as the oldest fossiliferous 

 rocks. 



Canid^. — The Dog-family, including the Dog, Wolf, Fox, 

 Jackal, etc. 



Carapace. — The shell enveloping the anterior part of the 

 body in Crustaceans generally ; applied also to the hard 

 shelly pieces of the Cirripeds. 



Carboniferous. — ^This term is applied to the great for- 

 mation which includes, among other rocks, the coal- 

 measures. It belongs to the oldest, or Paleozoic, 

 system of formations. 



Caudal. — Of or belonging to the tail. 



Cephalopods. — The highest class of the Mollusca, or soft- 

 bodied animals, characterized by having the mouth 

 surrounded by a "greater or less number of fleshy arms 



