GLOSSARY. 331 



EC'DY-SIS (Gr. ekdusis. a stripping off). A shedding or moulting of the skin. 



E-CHI-NO-COC'CI (Gr. echinos, a hedgehog ; kokkos,& berry). The larval forms 

 (scolices) of the tapeworm of the dog (Tania echinococcus), commonly 

 known as " hydatids." 



E-CHI-NO-DER'MA-TA (Gr. echinos ; and derma, skin). A class of animals com- 

 prising the Sea-urchins, Star-fishes, and others, most of which have spiny 

 skins. 



E-CHI-NOI'DE-A (Gr. echinos ; and eidos, form). An order of Echinodermata, 

 comprising the Sea-urchins. 



E-CHIN'U-LATE. Possessing spines. 



EC'TO-CYST (Gr. ektos, outside ; kustis, a bladder). The external investment 

 of the coenoecium of a Polyzocn. 



EC'TO-DERM (Gr. ektos / and derma, skin). The external integumentary layer 

 of the Coelenterata. 



EC'TO-SARC (Gr. ektos; sarx, flesh). The outer transparent sarcode-layer of 

 certain Rhizopods, such as the Amoeba. 



E-DEN-TA'TA (Lat. e, without ; dens, tooth). An order of Mammalia often 

 called Bruta. 



E-DEN'TU-LOUS. Toothless ; without any dental apparatus. Applied to the 

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



E-DRI-OPH-THAI/MA-TA (Gr. hedraios, sitting ; ophthalmos, eye). The division of 

 Crustacea in which the eyes are sessile, and are not supported upon 

 stalks. 



E-LAS-MO-BRANCH'I-I (Gr. elasma, a plate ; bragchia, gills). An order of 

 Fishes, including the Sharks and Rays. 



EL'Y-TRA (Gr. elutron, a sheath). The chitinous 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, in; oruo, I swell). The earliest stage at wnich the young 

 animal is recognizable in the impregnated ovum. 



EN-CEPH'A-LON (Gr. egkephalos, brain). The portion of the cerebro-spinal 

 nervous axis contained within the cranium. 



EN-CEPH'A-LOUS (Gr. en, in ; kephale, the head). Possessing a distinct head. 

 Usually applied to all the Mollusca proper, except the Lamellibranchiata. 



EN-CYS-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 ; deros, skin). The inner plane of growth of the outer 

 integumentary layer (viz., the ectoderm, or epidermis). 



EN'DO-CYST (Gr. endon. within ; Icustis, a bag). The inner membrane or in- 

 tegumentary layer or a Polyzoon. In Crutatella, 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 Ccelenterata. 



EN-DOP'O-DITE (Gr. endon ; andpous, foot). The inner of the two secondary 

 joints into which the typical limb of a Crustacean is divided. 



EN'DO-SARC (Gr. endon; and sarx, flesh). The inner molecular layer of sarcode 

 in the Amoeba and other allied Rhizopods. 



EN-DO -SKEL'E-TON (Gr. endon; and skeletos, dry). The internal hard struc- 

 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. ensis, a sword; forma, shape). Sword- shaped. 



EN-TO-MOPH A-GA (Gr. entoma, insects ; phago, 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 ; zoon, animal). Animals which are parasitic in 

 the interior of other animals. 



E'O-CENB (Gr. eos, dawn ; kainos, new or recent). The lowest division of the 

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

 represented. 



