DEFINITIONS OF SYSTEMATIC NAMES. 
Acanthias, genus of sharks including com- 
mon dogfish, 
Acipenser, genus of ganoids; sturgeon. 
Aglossa, tongueless toads from Africa and 
South America. 
Allantoidea, the higher vertebrates with 
allantois; reptiles, birds and mammals. 
Amblystoma, genus of tailed amphibians, 
largely American. 
Amia, genus of ganoid fishes peculiar to 
America. 
Ammoceetes, the larval stage of the lam- 
preys. 
Amniotes, division of vertebrates with 
amnion and allantois in development; 
reptiles, birds and mammal. 
Amphibia, class of vertebrates, young with 
gills, adults with lungs; frogs, toads and 
salamanders. 
Amphioxus, fish-like form without verte- 
bre, type of group of Leptocardii. 
Amphipnous, eel-like fishes from India. 
Amphisbeenans, legless lizards. 
Amphiuma, genus of tailed amphibians 
with rudimentary legs and gill slits; 
southern U. S. 
Anallantoidea, vertebrates 
allantois; ichthyopsida. 
Anamunia, vertebrates without an amnion; 
ichthyopsida. 
Anguis, genus of footless lizards. 
Anser, genus of birds including geese. 
Anthropoids; sub order of primates includ- 
ing the higher apes and man. 
Anura, order containing the tailless amphib- 
ians; frogs and toads. 
Aquila, genus of birds including eagles. 
Archzopteryx, a fossil bird with teeth and 
a reptilian tail 
Archegosaurus, genus of extinct stego- 
cephal amphibians 
Arcifera, group including toads and tree 
toads. 
Arthrodira, order of extinct dipnoi (lung- 
fishes) some very large. 
Artiodactyla, ungulate mammals with even 
number of toes; cattle, sheep, deer. 
Astroscopus, genus of electric fishes; 
marine. 
Atelodus, genus of two-toed rhinoceros. 
Aves, the class of birds. 
without an 
Bdellostoma, genus of myxinoids; hag 
fishes of the Pacific. 
381 
Belone, genus of fishes; bony gars. 
Bombinator, genus of European toads, 
unke, 
Bradypus, genus of edentate sloths, 
Branchiosaurus, genus of extinct stego- 
cephal amphibia. 
Bufo, genus of amphibians, toads. 
Buteo, genus of raptorial birds, hawks, 
Butyrinus, genus of herring-like fishes. 
Cacilians, a group of legless tropical am- 
phibians, 
Caiman, genus of crocodiles, 
Calamoichthys, genus of ganoid fishes from 
Africa, 
Callopterus, genus of extinct ganoid fishes. 
Camptosaurus, genus of extinct dinosaur 
reptiles. 
Capitosaurus, genus of extinct stegocepha- 
lous amphibia. 
Carcharias, genus of sharks; sand shark. 
Carinate, birds with a keel to the sternum, 
includes all living birds except ostriches. 
Carnivores, order of flesh-eating mammals; 
cats, dogs, bears, weasels, seals. 
Castor, genus of rodents, beaver. 
Ceratodus, genus of dipnoi (lung-fishes) 
from Australia. 
Ceratophrys, genus of So. American toads. 
Cervus, genus of Ungulates, common deer. 
Cestracion, genus of sharks from the 
Pacific. 
Cetacea, order of mammals, whales. 
Chauna, genus of So. America crane-like 
birds; hooded screamers. 
Chelonia, order of reptile turtles. 
Chelone, genus of turtles, greec turtle. 
Chelydra, genus of turtles, snapping turtle. 
Chelydrosaurus, genus of extinct stego- 
cephalous amphibia. 
Chimera, genus of peculiar deep-water 
sharks. 
Chimeroids, order of shark-like fishes; 
Holocephaili. 
Chiroptera, order of mammal bats. 
Chlamydoselache, genus of primitive deep- 
sea sharks from Japan. 
Cholcepus, genus of edentates, sloths. 
Chondrostei, order of ganoid fishes, stur- 
geon. 
Chrysophrys, genus of fishes; sea bream of 
Europe. 
Chrysothrix, a genus of So. American 
monkeys. 
