A LIST OF THE GENERA AND FAMILIES OF MAMMALS. 59 
Trimenodon. Tritomodon. Uranodon. Zeuglodon. 
Trimerodus. Tritylodon. Xesmodon. Ziphacodon. 
Trinodontomys. Tropodon. Xiphacodon. Zotodon. 
Triodon. Tylodon. Xiphodon. Zygodon. 
Tripriodon. Typhlodon. Xiphodontherium. Zygodontomys. 
Trirhizodon. Upmesodon. Zetodon. Zygolophodon. 
DOUBLE GENERIC NAMES. 
A special elass of compounds, which may be described as * double 
generic names,’ has been largely used in the case of mammals. Nearly 
200 such names have been proposed, chiefly to denote resemblance or 
close relationship, and, when well chosen, serve the purpose admirably. 
They have the advantage of being self-explanatory, and are not apt to 
be preoccupied. They are ordinarily formed by combining two generic 
names into one, as Adapisorex and Cervalces, although some of them 
may be simply classical compounds of two names of animals, as C'riel- 
opardalis and Cynaloper. In either case the result is the same. 
Compounds of cyno (xvcv), gale, and myo (40s) are most frequent, as 
will be seen by reference to the following list: 
List of double generic names. 
Compounds of theriwm (which is never used alone as a genus) are omitted. 
Adapisorex. 
Adapisoriculus. 
Aelurictis. 
Aelurogale. 
Alcelaphus. 
Anchippus. 
Anchitheriomys. 
Antechinomys. 
Anthropopithecus. 
Antilocapra. 
Arctailurus. 
Arctictis. 
Arctocebus. 
Arctocyon. 
Arctodictis. 
Arctogale. 
Arctogalidia. 
Arctomys. 
Arctophoca. 
Arctopithecus 
Bassaricyon. 
Bibos. 
Blarinomys. 
Boochcerus. 
Boselaphus. 
Bucapra. 
Budorcas. 
Butragus. 
Camelopardalis. 
Camelomeryx. 
Canimartes. 
Caprolagus. 
Capromys. 
Caprovis. 
Castoromys. 
Catolynx. 
Catopuma. 
Cebochceerus. 
Cebugale. 
Cerdocyon. 
Cervalces. 
Cervequus. 
Cervicapra. 
Cheeropithecus. 
Cheerelaphus. 
Choeromeryx. 
Cheeronycteris. 
Cricetodipus. 
Cricetomys. 
Criotaurus. 
Cynailurus. 
Oynalopex. 
Cynarctus. 
Cynhy:ena. 
Cynictis. 
Cynocebus. 
Cynocheerus. 
Cynodictis. 
Cynofelis. 
Cynogale. 
Cynomys. 
Cynonasua. 
Cynonycteris. 
Cynopithecus. 
Cynorca. 
Damelaphus. 
Diposorex. 
Dorcatragus. 
Dorcelaphus. 
Ducantalpa. 
Elaphocheerus. 
Elaphalces. 
Eliomys. 
Enhydrictis. 
Enhydrocyon. 
Galecynus. 
Galemys. 
Galeocebus. 
Galeolemur. 
Galeopardus. 
Galeopithecus. 
Galeospalax. 
Galictis. 
Galidictis. 
Gliscebus. 
Glisorex. 
Hippelaphus. 
Hippocamelus. 
Hippohyus. 
Hipposyus. 
Hipporussa. 
Hippotigris. 
Hippotragus. 
Hyeenailurus. 
Hy:enaretus. 
Hyeenictis. 
Hyzenocyon. 
Hyeenodictis. 
Hyelaphus. 
Hyemoschus. 

4 Names made by combining two generic terms or two classical names of animals. 
