46 GLOSSARY. 



Ephip'pium (Gr. ephippios, belonging to a horse or riding). 

 A structure formed under some circumstances in the 

 Ostracoda, which contains the ova, and which is developed 

 from a " saddle-like " area of the integument. 



Ep'iblast (Gr. epi, upon; blastos, a shoot). The outer layer of 

 the blastoderm. 



Epible'ma (Gr. epiblema, a covering). The integument of the 

 root of a plant. 



Epi'boly (Gr. epibole, throwing on, imposition). A condition 

 in the development of some invertebrate ova in which the 

 epiblast appears to grow over the hypoblast. 



Epibran'chial i^Gr. epi, upon; branchia, a gill). A subdivision 

 of the branchial region of the carapace in the Brachyura. 



Epiclei'dium (Gr. epi, upon ; kleis, kleidos, collar-bone). A 

 separate ossification of the scapular end of the clavicle in 

 most passerine birds. 



E'picoele (Gr. epi, upon ; koile, a hollow, cavity). A term 

 applied to the perivisceral cavity of the Invertebrata when 

 it is formed by invagination of the ectoderm. 



Epico'racoid (Gr. epi, upon; korax, a crow). One of the 

 bones of the pectoral arch in some of the Vertebrata. 



Epicra'nial su'ture (Gr. epi, upon ; kranion, the skull ; L. su- 

 tura, a seam). A suture running the entire length of the 

 epicranium in the cockroach. 



Epicra'nium (Gr. epi, upon ; kranion, the skull) , The dorsal 

 wall of the head of a cockroach. 



Epider'mis (Gr. epi, upon; derma, skin). The outer non- 

 vascular layer of the skin in animals. The external cellular 

 covering of plants. 



Epidi'dymis (Gr. epi, upon ; didumos, a testicle). The convo- 

 luted portion of the efferent duct of the testicle. 



Epigas'tric (Gr. epi, upon ; gaster, the belly). A term applied 

 to two of the lobes of the carapace in the Brachyura. 



Epigas'trium (Gr. epi, upon ; gaster, the belly). The upper 

 region of the abdomen in man, below the sternum, and 

 between the costal cartilages of opposite sides. 



Epiglot'tis (Gr. epi, upon ; glottis, the aperture between the 

 vocal cords). The cartilaginous lid which lies above the 

 glottis. 



Epihy'al (Gr. epi, upon; L. hyoides, hyoid bone). The upper 

 ossification of the cornua of the hyoidean arch in 

 Teleostean fishes, represented in Human Anatomy by the 

 stylo-hyoid ligaments. 



