GLOSSARY. 135 



CRINOIDEA (Kplvov, a lily), an order of EcMnofarmata, also called Piimigrada. 



CRUSTACEA (crusta, a shell), a class of Annulosa. 



CTEXOPHORA (xrefs, a comb ; <pfp<a, to bear), an order of Actinozoa. 



CUTIS (skin), applied to the vascular layer, or true skin, which is also called 



corium and derma, as distinguished from the scarf-skin, cuticle, or epidermis. 

 CYCLOBRANCHIATA (KVK\OS, & ring ; ftpdyx 1 *, gills), a family of Gasteropoda. 

 CvsTicERcrs (KVO-TIS, bladder ; KfpKos, tail), the wandered scolex of Tsenia soUum, 



in its hydatid form. 

 DECIUUA (sc. membrana, de and cado), the modified mucous membrane of the 



pregnant uterus, when it falls off at birth. 

 DEMODEX (Si)fj.6s, fat ; 5^|, a worm), a minute Arachnid allied to the Pentastomida, 



and inhabiting the sebaceous follicles of Man. 

 DERMA TOPTERA (Se'pjta, skin; irrp6v, wing , a family of insects with membranous 



wings. 

 DIAPHRAGM (Sia'tppa-y/ua, otherwise called fyp-hv, whence the adj. phrenic), the 



muscle which in Mammalia separates the abdomen from the thorax. 

 DIASTEMA (Sid, apart ; TO-TTJ/XJ, to place), an interval, especially between teeth. 

 DiATOiiACEA (5iaTf/j.vw, to cut through), the silictous coverings of a large group of 



microscopic low vegetable organisms. 

 DiCYNoroN (5i-, two; KVUV, a dog; otiovs, tooth), an extinct reptile with two 



canine-like teeth. 



DIDELPHIA (5(-, two; 8eA<pus, the womb', the subclass of Marsupial Mammals. 

 DIGITIGRADA (digitus, a finger; gradere, to walk), a term applied to those mammals 



which walk on the phalanges of their fore and hind feet. 

 DINOSAURIA (Seiv6s, terrible ; vavpa, lizard), an extinct order of reptiles. 

 DKECIOUS (5j-, two ; olicos, a house), with distinct sexes. 

 DIPNOI (Si-, double; irvoii, breath), an order of Fishes which breathe both by 



lungs and gills, otherwise known as Diplopnoi or Protopteri. 

 DtcoPHORA (SiffKos, a quoit or disk ; <pepo>, bear), an order of Annelida, also called 



Suctoria, corresponding with the family of Leeches (Hirudinea). 

 ECDYSIS (e/cSuo-is, fr. (ic8v<a, to put oft ), casting the skin, or moulting. 

 ECHINOOOCCUS (e'x'i'os, an urchin ; K^KKOS, a berry), the wandered scolex of Tsenia 



echinococcus, in its hydatid form, with deuto-scolices. or daughter cysts formed 



by gemmation. 

 ECHINODERMATA (ex^os, a hedgehog or urchin, hence applied to the Sea-urchin, 



and Septet, skin), a class represented by the Sea-urchin. 



ECHINOEHTNCHUS (e'x""", a hedgehog; pvyx s > snout;, a genus of Acanthncepliala. 

 EDENTATA (e and den*), without teeth, an order of Mammalia in which the teeth 



are wholly or partially absent. 

 EDKIOPHTHALMIA, or Hedrxophthalmia (ISpcuos, sessile ; 6<pda\fj.6s, eye), an order 



of Crustacea, including the Isopoda, Amphipoda, and Lxmodipoda. 

 ELASMOBRANCHII (eAa<r^o, a thin plate or lamina; /Spcfyxm, gills), an order of 



Fishes, including the Desmiobranchii Plagiostoma or Pentabranchii of Cuvier, 



or Placoidei of Agassiz), and Holocephali. 

 ELYTBUM (eAurpoj', fr. t\vw, to roll round Arist. H. A. iv., vii. 8), the hard first 



pair of wings which in Beetles cover the second pair. 

 EMBRYO (Z^frpvov, fr. eV and Ppvov, fr. fipvca, swell), the earliest stage in which an 



animal appears in impregnated ovum : later, especially among Vertebrata, it 



is called foetus. 

 ENDO-PODITE (ft>8ov, within ; irovs, foot), the internal distal segment of the typical 



limb of Crustacea. 



