GLOSSARY. 47 



Epi'meron (Gr. epi, upon; meros, a part). In the Crustacea, 

 that part of the lateral wall of a somite which is situated 

 external to the articulation of the appendage. 



Epio'tic (Gr. epi, upon ; ous, otos, the ear). A bone of the skull 

 above the ear, occurring as a separate ossification in some 

 of the Vertebrata. 



Epipharynge'al (Gr. epi, upon ; pharynx, the throat). The 

 uppermost articulations of the anterior four pair of bran- 

 chial arches in the osseous fishes. 



Epiphar'ynx (Gr. epi, upon ; pharynx, the throat). A struc- 

 ture which in some Insecta overlaps the mouth. 



Epiphloe'um (Gr. epi, upon; pillows, bark). The outer cellular 

 layer of the bark in exogenous trees. 



Epi'physis (Gr. epi, upon; phusis, growth). A part of a bone 

 ossified from a separate supplementary centre, as found at 

 the extremities of many long bones. 



Epi'physis ce'rebri (Gr. epi, upon ; phusis, growth ; L. cerebri, 

 of the brain). Another name for the pineal gland. 



Epiplas'tron (Gr. epi, upon ; plastos, formed, moulded). The 

 first lateral piece of the plastron in the Chelonia. 



Epipo'dia (Gr. epi, upon; pous, podos, a foot). Lateral appen- 

 dages of the foot in some Mollusca, 



Epi'podite (Gr. epi, upon; pous, podos, a foot). An appendage 

 of the four anterior ambulatory limbs in some Crustaceans. 



Episke'letal (Gr. epi, upon). A term applied to those muscles 

 which are upon or outside the endoskeleton. 



Epister'num (Gr. epi, upon ; sternon, the breast). A median 

 membrane bone, which in many Vertebrata is connected 

 with the sternum, and is also called the interclavicle. 



Episto'ma (Gr. epi, upon; stoma, a mouth). The antennary 

 sternum in some Crustacea. 



Epithe'lioid (epithelium ; Gr. eidos, form) . A term applied 

 to the flattened cells which line the serous membranes, 

 the heart, and blood-vessels. 



Epithelium (Gr. epi, upon; thallo, I grow). A term applied 

 generally to one or more layers of cells coating any of the 

 free surfaces of the body. 



Epizo'a (Gr. epi, upon ; zoon, an animal). A group of Crusta- 

 ceans which are parasitic upon other aquatic animals. 



Epoo'phoron (Gr. epi, upon; don, an egg; phoreo, I bear). In 

 the human subject, a group of tubules lying between 

 the Fallopian tube and ovary, and sometimes called the 

 parovarium. 



