BRA 



[ 60] 



B R I 



incisor teeth; others want the 

 incisors and cuspidati; in others, 

 the jaws are destitute of teeth. 

 Placed by Linnaeus in the class 

 Mammalia, and composing the 

 third order. The order Bradypoda 

 includes the genera Bradypus, or 

 Sloth, Mermecophaga, Ant-eaters, 

 Manis, Scaly Lizard or Pangolin, 

 Dasypus, Armadillo, and Ornithor- 

 rhynchus. Duck-billed animal. 



BRA'DYPUS. (ppaSinrovs, Gr.) The 

 sloth, a genus of the order Brady- 

 poda, class Mammalia. These 

 animals have no fore-teeth ; they 

 have six grinders in either jaw; 

 and their bodies are covered with 

 hair. There are several species. 



BRA'NCHIA. (from ppdy%ia, Gr.) 

 This word is rarely used substan- 

 tively ; it makes branchiae in the 

 plural. Branchiae are filamentous 

 organs for breathing in water ; 

 gills. Respiration is effected by 

 the transmission of water through 

 the mouth, over the surface of the 

 fringe-like branchiae; and the 

 blood is transmitted to the gills 

 from the ventricle, whence, instead 

 of returning immediately to the 

 heart, it is conveyed by the bran- 

 chial veins to the body ; these 

 veins after giving branches to the 

 anterior parts, unite to form the 

 aorta, which sends the arterialized 

 blood through the rest of the 

 system, without the aid of a sys- 

 temic heart. 



BRANCHIO'PODA. (from ppd^x ta > an< ^ 

 TTOVS, Gr.) The third order of the 

 class Crustacea. 



BBANCHTO'PODOTJS. Gill-footed ; be- 

 longing to the order Branchiopoda. 



BBANCHIO'STEGI. (from ppd^^ia, gills, 

 and ffre'ryos, or <rre'ryi/, a covering.) 

 A term used to express one of the 

 orders of fishes, the characters of 

 which are, that the rays of the 

 fins are of a bony substance. 



BBANCHIO'STEGOTTS. Having the cha- 

 racters of the branchiostegi ; be- 

 longing to the order Branchiostegi ; 

 having the gills covered. 



BRA'NCHIPTJS. The cancer stagnalis 

 of Linnaeus ; an animal belonging 

 to the crustaceans, having the legs 

 reduced to soft paddles, and com- 

 bining the functions of respiration 

 with those of locomotion. In the 

 branchipus, we find antennae, but 

 no crustaceous legs. The soft 

 branchiae of branchipus perform 

 the double office of lungs and feet. 



BRAU'NITE. (The Brachytypes man- 

 ganerz of Mohs.) A mineral of a 

 brownish black colour, occurring 

 massive and crystallized, consisting 

 of protoxide of manganese 87 per 

 cent. ; oxygen 10 per cent. ; baryta 

 2.26 per cent. ; and water nearly 

 1 . It has been thus named after 

 Mr. Braun of Gotha. 



BRE'CCIA. (Ital.) Any rock com- 

 posed of angular fragments ce- 

 mented together. 



BRE'CCTATED. Composed of angular 

 fragments united into a mass by 

 .cement. 



BRE'CCTATED AGATE. A beautiful 

 variety of agate, consisting of frag- 

 ments of ribbon agate united by a 

 base of amethyst, it is found in 



BEEI'SLAZITE. A Yesuvian mineral, 

 thus named after Breislak. 



BBE'WSTEETTE. An earthy mineral, 

 so named after Sir D. Brewster. 

 It occurs in small white, or yel- 

 lowish coloured crystals, and con- 

 sists of silica 53 -65, alumina 17'4, 

 strontia 8'32, baryta 6'75, lime 

 1-34, water 12-58, oxide of iron 

 0-29. Sp.gr. 2'1, hardness 5 to 5-5. 



BEI'LLIANT. (Irillant, Fr. Irillante, 

 It.) A diamond cut into angles, 

 by which the rays of light are 

 refracted, and a greater brilliancy 

 is obtained. 



] Rock-crystal, 

 , j or crystallized 



BBI'STOL-STONE. 



BRISTOL-DIAMOND, 



quartz. Very fine specimens are 

 found in the rocks near Bristol, and 

 these have thence obtained the 

 name of Bristol diamonds. They 



