164 ZOOLOGY. 



Endoderm (Gr. endon; derma, skin) The inner layer of the 



Coelenterata. 

 Endosarc (Gr. endon; sarx, flesh) The inner sarcode of the 



Amoeba. 

 Entomostraca (Gr. entoma, insects; ostrakon, a shell) A group of 



minute fresh- water Crustacea. 



Entozoa (Gr. entos, within ; zoon, an animal) Intestinal worms. 

 ^Epidermis (Gr. epi, upon ; derma, the skin) The cuticle or outer 



layer of the skin. 

 Equilateral (Lat. cequus, equal; latus, a side) Equal-sided; applied 



to the shells of the Bracliiopoda. 

 Equivalve Having equal valves, as in most of the shells of the 



Lamellibranchiata. 

 Exoskeleton (Gr. exo, without) The outer skeleton of insects, &c., 



formed by a hardening of the integument. 



Fauna (Lat. fauni, rural gods) The native animals of a country 



or district. 



! Femur The thigh bone, placed between the pelvis and the tibia in 

 the higher Vertebrates. 



Fibula (Lat. a brooch) The smaller bone of the leg, correspond- 

 ing to the ulna of the fore-arm. 



Fission (Lat. findo, I cleave) A method of reproduction by self- 

 division, found in the Infusoria and other animals. 



Flora (Lat. the goddess of flowers) The plants of a country or 

 district. 



Foot- Jaws Certain limbs of the Crustacea which serve as masticat- 

 ing organs. 



Foot-Tubercles The unjointed limbs of the Annelida. 



Foraminifera (Lat. foramen, a hole ; fero, I bear) A group of 

 Rhizopoda which possess minute, calcareous shells. These 

 shells are perforated by minute apertures, through which 

 pseudopodia are protruded. 



. Furculum (Lat. furca, a fork) The V-shaped bone in birds, 

 formed by the union of the clavicles. It is commonly called 

 the * ' merry- thought. " 



Ganglion (Gr. a knot) A mass or centre of nervous matter, con- 

 taining nerve cells, from which nerve fibres proceed. 

 ^Ganoid (Gr. ganos, splendour) A term applied to fish scales, 

 which are composed of an inner layer of bone, and an outer 

 layer of shining enamel. 



Gasteropoda (Gr. gaster, the belly; pous, foot) A class of Mollusca 

 usually furnished with univalve shells. They are so called 

 because the locomotive organ consists of a broad muscular 

 disc, occupying the lower surface of the body. 



