AND 



Titanite. It is found in Dauphiny, 

 Bavaria, Norway, Switzerland, 

 Spain, and Brazil. It is a pure 

 octahedral oxide of titanium. Its 

 colours are brown and blue ; struc- 

 ture lamellar ; lustre splendent and 

 adamantine ; it scratches glass. 

 Specific gravity 3-80. The Abbe 

 JETaiiy states the primitive crystal 

 of anatase to be an acute octohedron 

 the common base of the pyramids 

 is square: the reflecting goniometer 

 gives the measurement 13647'. 



ANA'TIFA. A cuneiform multivalve, 

 composed of several unequal valves, 

 five or more, united together at the 

 extremity of a cartilaginous tube, 

 fixed at its base. The opening 

 without an operculum. Parkinson. 

 The genus comprises several species. 

 It belongs to the class Cirrhopoda. 

 The anatifaa are often found ad- 

 hering to rocks, pieces of wood, the 

 bottoms of ships, &c. 



ANA'TIFEB. (from anas, a duck, and 

 fero, to bear, Lat.) A name given 

 to the barnacle, or pentelasmis. 

 The same as Anatifa. 



ANATI'NA. A genus of bivalve shells, 

 belonging to the family Myaria ; it 

 is thin, transparent, inequilateral, 

 transverse; hinge with a spoon- 

 shaped process containing the carti- 

 lage, and a small shelly moveable 

 appendage. Sowerly. A single 

 species is recorded fossil in the 

 Oxford clay and great oolite. 

 Lycett. 



A^CI'LLA. \ An oblong subcylin- 



ANCILLA'BIA. j drical univale, with 

 a short spire, not channelled : the 

 aperture effused, and its base slightly 

 notched. Parkinson. The ebuana 

 glabrata, or ivory shell, belongs to 

 the genus Ancilla. It is found both 

 fossil and recent. 



ANDALU'SITE. A massive mineral of 

 a red or grey colour ; it occurs also 

 crystalized. Lustre shining, glis- 

 tening, and vitreous. Fracture 

 uneven ; is easily broken. Feebly 

 translucent. Specific gravity 3-160. 



Constituent parts, alumina 52, silica" 

 32, potash 8, oxide of iron 2. It 

 was first found in Spain ; it occurs 

 in gneiss in England, Ireland, and 

 Scotland. 



A'NDESIN. (from Andes, the mineral 

 having been found in that mountain 

 range.) A variety of feldspar. 



A'NDESITE. "When feldspar is of the 

 variety called Andesin, and the 

 rock contains hornblende, some 

 mica, and a little quartz, it is 

 called Andesite. Jukes. 



ANDBE'OLITE. Thus named from its 

 having been first found at Andre- 

 asberg, in the Hartz; called also 

 Harmotome, and, sometimes, from 

 form of its crystals, cross- stones. 

 Its crystals are two four-sided 

 flattened prisms, terminated by 

 four-sided pyramids, intersecting 

 each other at right angles; the 

 plane of intersection passing lon- 

 gitudinally through the prisms. 

 Texture foliated. Colour milk- 

 white. Constituent parts, silica 

 44, alumina 20, barytes 20, water 

 16. It effervesces with borax and 

 microcosmic salt, and is reduced to 

 a greenish opaque mass. With 

 soda it melts into a frothy white 

 enamel. When its powder is thro wn 

 on a hot coal, it emits a greenish 

 yellow light. Thomson. 



ANDRO'GYNOTJS. | (from avrfp and <yvvij, 



ANDRO'GYNAL. j Gr.) Having two 

 sexes; being both male and female; 

 hermaphroditical. Plants bearing 

 male and female flowers on the 

 same root are thus called. 



ANEMO'METEB. (from aW/^os and 

 peTpov, Gr. anemometre, Fr. anemo- 

 metro, It.) An instrument for 

 measuring the strength or velocity 

 of the wind. 



ANEN'CHELUM. A genus of fossil fish, 

 found in the locality of Glaris, and 

 described by Blainville. 



ANEN'TEKA. The name assigned to a 

 group of monads from their having 

 no intestinal canal. In this the 

 simplest form of animalcules there 



