132 The American Naturalist. [March. 
Horns simple spikes CoassusQx2.^. 
Horns more or less furcate Cariacus <:.x^^ . 
Horns palmate RangiferYL. Smith. 
aa. Nasal passage posteriorly one, not divided (Capreoli). 
No horns Hydropotes '&^-\vi\i. 
ilorns furcate; no postantler Capreohis Gray. 
Horns palmate; no postantler Alces H. Smith. 
Horns palmate ; a postantler Cervalces Scott. 
n. Lateral metapodials represented by proximal splints only ; nasal passage 
not divided (Plesiometacarpi). (Cervi). 
No trontal glands ; horns simple Elaphodus M. Ed w 
No frontal glands ; horns furcate Cervus Linn. 
No frontal glands; horns palmate Dama H. Smith. 
Horns furcate; brow antler greatly exceeding beam, {fi\\\).. .ElapJmrus M. Edw. 
The phylogeny of these genera cannot be fully known until 
the skeletons of the extinct genera and species have been ob- 
tained. It is, however, certain that the short series of genera 
included in each of the three divisions (n a and aa. Hi) 
are genetic series ; and also that division I is ancestral to 
both n and in, although perhaps by an extinct genus differ- 
ing in some respects from Moschus. These relations can be 
thus expressed : 
