GLOSSARY. 45 



En'dostyle (Gr. endon, within; stulos, a column, style). A 

 fold of the endoderm in the Ascidioida, which projects 

 into the blood cavity. 



Endothe'lium (Gr. endon, within; thallo, I bloom). The 

 delicate layer of epithelium which lines the blood and 

 lymph capillaries. 



En'siform (L. ensis, a sword ; forma, form). Sword-shaped. 

 Applied to the cartilaginous process of the sternum. 



En'teroccele (Gr. enteron, intestine; koile, a hollow). In the 

 Invertebrata, a perivisceral cavity, or series of cavities, 

 formed from a diverticulum of the digestive cavity. 



Enteropneu'sta (Gr. enteron, an intestine ; pneuso, I breathe). 

 A group of the Invertebrata having only one known 

 representative. The branchial apertures open from bran- 

 chial sacs, which are dilatations of the alimentary canal. 



Entogas'tric (Gr. entos, within ; gaster, the stomach). Applied 

 to a mode of reproduction by gemmation which exists in 

 some Hydrozoa, in which the bud grows out from the wall 

 of the gastric cavity, and passes by it to the exterior. 



Entoglos'sal (Gr. 'entos, within ; glossa, the tongue). An ossi- 

 fication of the hyoidean arch which in the Teleostei 

 supports the tongue. 



Entomo'phaga (Gr. entoma, insects ; pJiago, I eat). A group of 

 the Edentata which feeds upon vegetable food only. 



Entomos'traca (Gr. entoma, insects ; ostrakon, a shell). A 

 group of minute fresh-water Crustaceans. 



Entoplas'tron (Gr. entos, within ; plastos, formed, moulded). 

 The median piece of the plastron in the Chelonia. 



Entoproc'ta (Gr. entos, within ; proktos, the seat or anus). A 

 group of Polyzoa in which the anus lies within the circle 

 of tentacles. 



Ento/ter'ygoid (Gr. entos, within ; pteryx, awing; eidos, shape). 

 A bone of the skull in the Teleostean fishes. 



Entop'tic (Gr. entos, within ; optikos, optical). A term applied 

 to certain phenomena of vision produced by absorption and 

 refraction within the eye. 



Entozo'a (Gr. entos, within; zoon, an animal). Animals which 

 are parasitic in the interior of other animals. 



Ipence'phalon (Gr. epi, upon ; enkephalon, the brain). The 

 hind brain, comprising the Cerebellum, Pons Varolii, and 

 anterior part of the Fourth Ventricle. 



Epen'dyma (Gr. epi, on ; enduma, clothing). The lining mem- 

 brane of the cerebral hemispheres. 



