OLOSSART. 



691 



vies ; in manj' insects the fore 

 stomach or proventriculus. 

 Cuticle. Tlie outermost layer of 

 the integument. 



Dentate. Furnished with teeth. 



Dldelphi.v (Gr. cUs, two, or dou- 

 ble ; delphus, womb). The sub- 

 class of Marsuj)ials. 



Differentiation. The special- 

 ization or setting apart of special 

 organs for special work, as the 

 specialization of the hand of man 

 from the fore-foot of other mam- 

 mals ; also applied to the special 

 development during embryonic 

 life of parts adapted for peculiar 

 or special functions. 



Dimidiate. Half round. 



Dicecious (Gr. dis, two ; aikos, 

 house). With distinct sexes. 



DrPTBRA (Gr. dis, two ; pteron, 

 wing). Two-winged flies ; an 

 order of insects. 



Diverticulum. An offshoot 

 from a vessel or from the 

 alimentary canal. 



EcDYSis (Gr. ekdusis, casting off). 

 The process of casting the skin ; 

 moulting. 



EcHiNODEKMATA (Gr. ecMnos, a 

 hedgehog or urchin ; hence ap- 

 plied to the sea-urchin ; and 

 derma, skin). The fourth sub- 

 kingdom of animals. 



Elasmobkanchii (Gr. elamui, a 

 strap ; bragcMa, gill). The 

 sharks and rays. 



Elytra (Gr. elutron, a sheath). 

 The fore-wings of beetles, serv- 

 ing to cover or sheathe the hind 

 wings. 



Epistoma. That part of the face 

 of flies situated between the 

 front and the labrum. 



Equilateral. Having the sides 

 equal, as in Brachiopod shells. 



Equivalve. Applied to shells like 

 the clams and most Lamelli- 

 branchs, which are composed 

 of two equal pieces or valves. 



Exserted. Protruded , opposed 

 to enclosed. 



ExuviUM. Cast-off skin. 



FissiPABOUS (Lat. fissus, cleft ; 

 jjario, to brmg forth). Applied 

 to a form of asexual generation 

 where the parent splits into two 

 parts, each part becoming a new 

 individual. 



Gbmmip ARGUS (gemma, bud ; 

 pario, to bring forth). Applied 

 to a form of asexual generation 

 where new individuals arise as 

 buds from the body of the 

 parent. 



Glabrous. Smooth ; opposed to 

 hairy ; downy, villous. 



Glaucous. Bluish green or gray. 



H^mal (Gr. Jiaima, blood). 

 Connected with the blood-ves- 

 sels or heart. 



Haltebes (Gr. halteres, poisers). 

 Balancers ; the rudimentary 

 hind wings of Diptera. 



Haustella-TE. Furnished with a 

 proboscis so as to take food by 

 suction. 



Hemiptbra (Gr. liemi, half; pteron, 

 wing). An order of insects with 

 the fore-wings partly opaque, 

 hence called hemelytra. 



Hermaphrodite (Gr. Hermes, 

 Mercury ; Aphrodite, Venus). 

 Any animal haying the organs of 

 both sexes, usually the ovary 

 and testes, combined in the same 

 individual. 



