GLOSSARY. 377 



Eo'dt-sis (Gr. ckdusis. a stripping off). A sliedding or moulting of the skin. 



E-CHi-NO-ooc'ci ( Gr. echinos^ a hedgehog ; koklcos^ a berrvj. The larval forms 

 (scolices) of the tapeworm of the dog {Tienia ec/imococcus), commonly 

 known as "hydatids." 



E-chi-no-der'ma-ta (Gr. ecJdnos ; and derma, skin). A class of animals com- 

 prising the tSea-urchins, Star-lishes, and others, most of which have spiny 

 skins. 



E-chi-noi'de-a (Gr. ecliinos ; and eidos, form). An order of Efhinodennata^ 

 comprising the Sea-urchins. 



E-chin'u-late. Possessing spines. 



Ec'to-cyst (Gr. ektos, outside ; kusti^^ a bladder). The external investment 

 of the ccenijscium of a Polyzo n. 



Ec'to-debm (Gr. ektos ; and derma^ skin). The external integumentary layer 

 of the (Jcelenterata. 



Eg'to-saro (Gr. ektos ; sarx^ flesh). The outer transparent sarcode-layer of 

 certain RJdzopods^ such as the Artitxha. 



E-den-ta'ta (Lat. e^ without; di)iS^ tootli). An order oi Mainmalia often 

 called Bruta. 



E-dek'tu-locs. Toothless ; without any dental apparatus. Applied to the 

 mouth of any animal, or to the hinge of the bivalve Molluscs. 



E-DRi-OPH-THAL'MA-TA(Gr. hedvaios^ sitting ; ophfhalmos^ eye). The division of 

 Crustacea in. which the eyes are scKsile, and are not supported upon 

 stalks. 



E-las-mo-beanch'i-i (Gr. elasma^ a plate ; bragchia^ giUs)* An order of 

 Fishes, including the Sharks and Rays. 



El'y-tra (Gr. elutron^ a sheath). The chitinou.s anterior pair of wings in 

 Beetles, which form cases for the posterior membranous wings. Also ap- 

 plied to the scales or plates on the back of the Sea-mouse {Aphrodite). 



Em'bry-o (Gr. en-^ iti • hruo^ I swell). The earliest stage at which the young 

 animal is recognizable in the impregnated ovum. 



En-ceph'a-lon (Gr. egUephalos^ brain). The portion of the cerebro-spinal 

 nervous axis contained within the cranium. 



En-ceph'a-lous (Gr. ^w, in; hephale^ the head). Possessing a distinct head. 

 Usually applied to all the MoUusca proper, except the Lamellihranchiata. 



En-cts-ta'tion (Gr. en^ in; kustis^ a bag). The transformation undergone by 

 certain of the Protozoa^ when they become motionless, and surround them- 

 selves by a thick coating or cyst. 



En'de-ron (Gr. en^ in ; dc-ros^ skin). The inner plane of growth of the outer 

 integumentary layer v^^iz., the ectoderm, or epidermis). 



En'do-ctst (Gr. endon within ; kustis^ a bag). The inner membrane or in- 

 tegumentary layer of a Polyzo n. In Cri&tatella., where there is no " ecto- 

 cyst," the endocyst constitutes the entire integument. 



En'^do-derm (Gr. endon; and derma^ skin). The inner integumentary layer 

 of the Cmlenterata. 



En-dop'o-dite (Gr. endon; and ^oi/s, foot). The inner of the two secondary 

 joints into which the typical linib of a Crustacean is divided". 



En'do-saro (Gr. endon ; Imdsarx, flesh). The innermolecular layer of earcode 

 in the Am^ceba and other allied Rhizopods. 



En-do -skel'e-ton (Gr. endon; and skeletos^ dry). The internal hard stmc- 

 tures, such as bones, which serve for the attachment of muscles, or the pro- 

 tection of organs, and which are not a mere hardening of the integument, 



En'si-form (Lat. emU^ a sword; forma^ shape). Sword shaped. 



En-to-moph'a-ga (Gr. entoma^ insects; pliago^ I eat). A section of the Mar- 

 supialia. 



En-to-mos'tra-ka (Gr. entoma., insects; ostrakon^ a shell). Literally, shelled 

 insects — applied to a division of Crustacea. 



En-to-zo'a (Gr. entos^ within ; soj?;., animal). Animals which are parasitic in 

 the interior of other animals. 



E'o GENE (Gr. eos, dawn ; kainos^ new or recent). The lowest division of the 

 Tertiary rocks, in which species of existing shells are to a email extent 

 represented. 



