GLOSSARY. 381 
ARCTOCYON (Gr. arctos, bear ; -‘kuon, dog). An extinct genus of Carnivora. 
ARENACEOUS. Sandy, or composed of grains of sand. 
ARENICOLITES (Lat. arena, sand ; colo, I inhabit). A genus founded on bur- 
rows supposed to be formed by worms resembling the living Lobworms 
(Arenicola). 
ARTICULATA (Lat. articulus, a joint). A division of the animal kingdom, com- 
prising Insects, Centipedes, Spiders, and Crustaceans, characterised by the 
possession of jointed bodies or jointed limbs. The term Arthropoda is now 
more usually employed. 
ARTIODACTYLA (Gr. artios, even; daktulos, a finger or toe). A division of the 
hoofed quadrupeds (Ungulata) in which each foot has an even number of 
toes (two or four). 
ASAPHUS (Gr. asaphés, obscure). A genus of Trilobites. 
ASCOCERAS (Gr. askos, a leather bottle ; keras, horn). A genus of Tetrabran- 
chiate Cephalopods. 
ASIPHONATE. Not possessing a respiratory tube or siphon. (Applied to a 
division of the Lamellibranchiate Molluscs.) 
ASTEROID (Gr. aster, a star; and eidos, form). Star-shaped, or possessing 
radiating lobes or rays like a star-fish. 
ASTEROIDEA. An order of Hchinodermata, comprising the Star-fishes, charac- 
terised by their rayed form. 
ASTEROPHYLLITES (Gr. aster, a star; phullon, leaf). A genus of Paleozoic 
plants, with leaves in whorls. 
ASTRAIDE (Gr. Astv@a, a proper name). The family of the Star-corals. 
ASTYLOSPONGIA (Gr. a, without; stulos, a column; spoggos, a sponge). A 
genus of Silurian Sponges. 
ATHyRISs (Gr. a, without ; thura, door). A genus of Brachiopods. 
AtTRYPA (Gr. @, without ; trupa, a hole). A genus of Brachiopods. 
AVES (Lat. avis, a bird). The class of the Birds. 
AVICULA (Lat. a little bird). The genus of Bivalve Molluscs comprising the 
Pearl-oysters. 
aoe (Gr. axon, a pivot; phullon, a leaf), A genus of Rugose 
orals. 
Azoic (Gr. a, without; z0é, life). Destitute of traces of living beings. 
BACULITES (Lat. baculum, a staff). A genus of the Ammonitide. 
BaL2&na (Lat. a whale). The genus of the Whalebone Whales. 
BALANID (Gr. balanos, an acorn). A family of sessile Cirripedes, commonly 
called ‘* Acorn-shells.” 
BaTRACHIA (Gr. batrachos, a frog). Often loosely applied to any of the Am- 
phibia, but sometimes restricted to the Amphibians as a class, or to the 
single order of the Anoura. 
BELEMNITID& (Gr. belemnon, a dart). An extinct group of Dibranchiate Ceph- 
alopods, comprising the Belemnites and their allies. 
BELEMNOTEUTHIS (Gr. belemnon, a dart ; teuthis, a cuttle-fish). A genus allied 
to the Belemnites proper. 
BELINURUS (Gr. belos, a dart; ouwra, tail). A genus of fossil King-crabs. 
BELLEROPHON (Gr. proper name). A genus of oceanic Univalves (Heteropoda), 
BELOTEUTHIS (Gr. belos, a dart ; teuthis, a cuttle-fish). An extinct genus of 
Dibranchiate Cephalopods. : 
BEYRICHIA (named after Prof. Beyrich). A genus of Ostracode Crustaceans. 
BILATERAL. Having two symmetrical sides. 
Bimana (Lat. bis, twice; manus, a hand). The order of Mammalia compris- 
ing man alone. 
BIPEDAL (Lat. bis, twice; pes, foot). Walking upon two legs. 
BIVALVE (Lat. bis, twice ; valve, folding-doors). Composed of two plates or 
valves ; applied to the shell of the Lamedlibranchiata and Brachiopoda, and 
to the carapace of certain Crustacea. 
BLASTOIDEA (Gr. blastos, a bud; and eidos, form). An extinct order of Echi- 
nodermata, often called Pentremites. 
BRACHIOPODA (Gr. brachion, an arm; pous, the foot). A class of the Mollus- 
