GENERAL AND GLOSSARIAL INDEX. 



Note. The Arabic figures refer, not to the pages, but to the numbered sections ; 

 the Roman numerals indicate the pages of the Introduction. 



A, a Greek prefix, signifying gene- 

 rally " without," as in Abran- 

 chiata (without gills, /3payx*a), 

 which see. 



Abdo x men (Lat. abdo, I conceal), the 

 posterior and principal cavity of 

 the animal, containing the bowels 

 and many other viscera. The 

 abdomen is distinct from the 

 thorax in crustaceans, spiders and 

 insects, 60. 



Abranchia'ta (Gr. a, without; 

 /8payx ta > gills)* mollusks devoid 

 of gills, xxii. 



Acale'pha (Gr. aKaX^rj, a nettle), 

 radiates with soft skins, which 

 have the property of stinging like 

 a nettle, xxiii. 



Acale^phae, digestion in the, 315. 



Ac'arus (Gr. dicapi, a mite), arach- 

 nides, as the cheese-mite and 

 allied species. 



Aceph'ala, Aceph'alous (Gr. a, with- 

 out ; KttiaXri, head), headless ; 

 animals in which a distinct head 

 is never developed, xxii. 662. 



Acetab'ula (Lat. acetabulum, a shal- 

 low cup), fleshy sucking cups, 

 with which many of the inverte- 

 brate animals are provided. 



Acetab'ulum, the, in man, 263. 



Ac'ini (Lat. acinum, a berry), the 

 secreting parts of glands, which 

 are suspended like grains or small 

 berries to a slender stem. 



Acotyl'edons, plants without a dis- 

 tinct cotyledon, 69. 



Acous'tic (Gr. afcouo, I hear), ap- 

 pertaining to sound, or the organ 

 of hearing. 



Ac'rita (Gr. dxpiroQ, confused), a 

 term applied to the lowest ani- 

 mals, in which the organs, and 

 especially the nervous system, 

 were supposed to be confusedly 

 blended with the other tissues. 



Actin'ia (Gr. IIKTIV, a ray), polyps 

 with many arms radiating from 

 around the mouth. 



Actino'ceras (Gr. CIKTIV, a ray ; 

 icepag, a horn), a generic term 

 signifying the radiated disposition 

 of the horns or feelers. 



Actin'oids", polyps, as the coral- 

 polyps, xxiii. 



Adipose x (Lat. adeps, fat), fatty. 



Affinities and analogies, 16. 



Ages of nature, 656690. 



Air, changes effected in, by respir- 

 ation, 393. 



A'lar (Lat. ala, a wing), belonging 

 to a wing. 



Albumen (Latin), the white of an 

 egg, 446. 



Albuminous, consisting of albumen. 



Al'iform (Lat. aliformis), shaped like 

 a wing. 



Alimentary canal, the, 312. 



Alimentation, or nutrition, 62. 



Allan'tois (Greek), a vesicular organ 



