GLOSSARY. 461 



AQUATIC, belonging to or inhabiting the water. Lat. aqua, 

 water. 



ARACII'NIDA, a class of articulated animals, including Spiders, 

 Scorpions, and Mites. Gr. arachne, a spider, eidos, form. 



ARBOREAL, belonging to or connected with trees. Lat. arbor, 

 a tree. 



ARBORESCENT, growing like a tree. Lat. arborescens, same 

 meaning. 



ARTICULA'TA, one of the great groups into which the animal 

 kingdom is divided. It includes all those orders which are 

 distinguished by their jointed or articulated structure, such 

 as Worms, Crabs, Insects, and Spiders. Lat. articulus, a 

 joint. 



ASCIDIOI'DA, an order of Zoophytes, so named from their resem- 

 blance in some points of structure to the " ascidia" a genus 

 of molluscous animals with a horny covering or tunic. 



ASSIMILATED, converted into the same nature as another thing. 

 Lat. assimilare, to become like. 



ASTEROI'DA, an order of Zoophytes. The polypes, when ex- 

 panded, exhibit a star-like figure. Gr. aster, a star, and 

 eidos, form. 



A'TROPHY, wasting from starvation. 



AURICLES, two of the muscular cavities of the heart of man 

 and other mammalia. Their form bears some resemblance 

 to an ear; hence the name, from the Latin auris, an ear. 



AVES, birds; they constitute one of the classes of the vertebrate 

 animals. 



BALEEN, the substance commonly known as " whalebone." 

 Lat. balcena, a whale. 



BARNACLE, a common name for one tribe of the articulated 

 animals, termed cirripeda, which are found adhering to 

 floating timber and the bottoms of ships. The common 

 name is derived from the Saxon, bearn a child, and aac, an 

 oak, " child of the oak," thus expressing the belief as to their 

 origin. 



" BASIN " of Paris, " Basin " of London. " Deposits lying in a 

 hollow or trough, formed of older rocks, and sometimes used 

 in geology almost synonymously with ' formations,' to 

 express the deposits lying in a certain cavity or depression 

 in older rocks." LYELL. 



BATRACHIA, an order of reptiles, including the Toad and Frog. 

 Gr. batrachos, a frog. 



BILIARY DUCT, in anatomy, a canal or vessel through which 

 the bile flows. 



BI'MANA, the order of mammalia of which man is the sole 

 representative. Lat. bis, twice, and manus, the hand, mean- 

 ing two-handed. 



BIVALVE SHELLS are those, like the Oyster and Cockle, which 

 are formed of two parts. Lat. bis, twice, valvce, doors. 



BRACHIO'PODA, "arm-footed," a class of bivalve molluscous 

 animals, with long ciliated arms. Gr. brachion, an arm, and 

 pous, a foot. 

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