428 



IKDEX. 



Crusta'cea, or Crustaceans, digestive 

 organs of the, 325; jaws, 337 ; cir- 

 culation, 369; respiration,38 1,405. 



Crypts, or follicles, 415. 



CrysHalline-lens, a transparent len- 

 ticular body, situated behind the 

 pupil of the eye, 126. 



Cte v noids (Gr. Krt vig, a tooth), fishes 

 which have the edge of the scales 

 toothed, xxi. 



Cte v nophori, soft radiated animals 

 moving by cilia, xxiii. 



Cuttle-fish, jaws of, 321 ; metamor- 

 phosis of, 563 ; mode of escape, 

 321 ; mode of swimming, 305. 



Cu'tis (Lat.), the true skin, the part 

 which is tanned to form leather. 



Cy t clobranchia v ta(Gr.KUKXoc:, round ; 

 flpayxia, gills), molluscous ani- 

 mals which have the gills disposed 

 in a circle. 



Cy v cloids, fishes with smooth scales, 



DEC'APODA (Gr. deica, ten ; TTOUC;, a 

 foot), crustaceous and molluscous 

 animals which have ten feet. 



Decid'uous, parts which are shed, or 

 do not last the lifetime of the animal. 



Deflect'ed, bent down. 



Deglutition, 345 



Dendrit'ic (Gr. devdpov, a tree), 

 branched like a tree. 



Departments, primary divisions of 

 the animal kingdom, xxi ; sub- 

 divided into classes, xxi. 



Der'mal (Gr. dtp^a, skin), belonging 

 to the skin. 



Development of the chick, 482 499. 



Devonian formation, 650. 



Diaphragm, the partition between 

 the chest and abdomen, 209. 



Diastole, the dilatation of the heart, 

 363. 



Di'branchiaHa (Gr. foe, twice; /Spay- 

 Xia, gills), cephalopods having 

 two gills. 



Dicotyl'edons, plants with two seed- 

 lobes, 74. 



Di'dactyle CGr. &g, twice ; and 



SctKTvXoc, a finger), a limb termi- 

 nated by two fingers. 

 Digestion, 312, 349 , in the infuso- 

 ria, 314 ; acalepha, 315 ; echino- 

 derma,316 ; polypifera, 317 ; mol- 

 lusca, 318 321 ; annelida, 322 

 324 ; crustacea, 325 ; arachnida, 

 326; insects, 327; vertebrata, 



328 ; microscopic examination, 



329 ; the stomach, 330 ; chymi- 

 fication, 331 334; mastication, 

 335 341 ; harmony of organs, 

 342 344 ; insalivation, 345 ; de- 

 glutition, 346 349. 



Digestive organs ; see Digestion. 



Digitate* (Lat. digitus, a finger), 

 when a part supports processes 

 like fingers. 



Dilu\ium (Latin), a deposit from the 

 water of a flood or deluge. 



Dimidiate (Lat. dimidium, half), 

 divided into two halves. 



Dimy'ary (Gr. t, twice ; fjivov, a 

 muscle), a bivalve whose shell is 

 closed by two muscles. 



Dip'tera (Gr. dig, twice ; Trrtpov, a 

 wing), insects which have two 

 wings. 



Dis'coid (Lat. discus, a quoit), quoit- 

 shaped. 



Discopho x ri, soft radiates, or jelly- 

 fishes, xxiii. 



Disk (Lat. discus, a quoit), a more 

 or less circular flattened body. 



Disto'ma (Gr. Sic,, two; ord/ua, 

 mouth), the intestinal w r orms with 

 two pores. 



Dist'oma, alternate generation ex- 

 emplified in the, 521. 



Distribution, geographical, of ani- 

 mals, 578641. 



Distribution in time of animals, 642 



Di v verticulum (from the Latin for a 

 bye-road), applied to a blind tube 

 branching out from the course of 

 a longer one. 



Do'do, an extinct bird, 629. 



Dor'sal (Lat. dorsum, the back), to- 

 wards the back. 



Dor'sal cord, in the germ, 459. 



