460 GLOSSARY. 



ALIMENTARY CANAL, that part of the intestine through which 

 the food passes, yielding its nutritive portions to the action 

 of certain vessels termed "absorbents." Lat. alimentum, 

 nourishment. 



AMBULA'CRA, a term applied to the rows of apertures in the 

 Star-fishes and Sea Urchins, from a fancied resemblance 

 to the straight alleys or avenues to old mansions. Lat. am- 

 bulacrum, an alley, a walk. 



AMMONITES, a group of chambered shells, belonging to the 

 Cuttle-fish tribe, and now extinct. They bear some resem- 

 blance to coiled snakes wanting the head, and take their 

 name from a similarity in their form to that of the horns on 

 the statues of Jupiter Ainmon. 



AMPHI'BIA, an order of Reptiles, which, by the possession of both 

 lungs and gills at the same time, or at different periods, are 

 fitted to live either on land or in water. Gr. amphibios^ 

 having a double manner of life. 



ANALOGOUS, a term used in Zoology to denote a resemblance 

 between two objects, or groups of objects, as distinguished 

 from the real structural relationship denoted by affinity. 



ANALOGUE, a term employed to denote the resemblance that 

 exists between animals in a fossil state and species still 

 living. The recent shell is said to be the analogue of the 

 fossil. 



ANALYSIS, the separation of a compound body into the several 

 parts of which it consists. From a similar Greek word, 

 signifying " unloosing." 



ANATOMIST, one who cuts up or dissects portions of the animal 

 frame, for the purpose of either acquiring, or communicating 

 to others, a knowledge of their structure. 



ANIMAL' GULES, those extremely small animals which are in- 

 visible to the naked eye. See INFUSORIA. 



ANNELLA'TA, a class of articulated animals in which the body, 

 like that of the Earth-worm, is composed of a number of 

 lings. Lat. annulus, a ring. 



AN'NELIDS, the members of the above class. The name has 

 the same origin. 



ANNULOSE ANIMALS, those with the body formed of successive 

 rings. Lat. annulus, a ring. 



ANOMOU'RA, a section of crustaceous animals, distinguished, like 

 the Hermit Crabs, by the irregular form of the tails. Gr. 

 anomos, irregular, and oura, a tail. 



ANTERIOR, Lat. that which goes before. 



ANTEN'N^E, the horns or feelers attached to the heads of insects 

 and Crustacea. 



A'PODA, without feet applied to fishes which, like Eels, have 

 no ventral fins. Gr. a, without, pous, podos, a foot. 



APPARATUS, the means or instruments for effecting a certain 

 end. Lat. apparo, I prepare. 



AP'TERA, an order of insects including all those which, like the 

 Flea, are destitute of wings. Gr. a, without, pteron, a wing. 



