CAMELID A 295 
unlike those of Dichodon bub the navicular and cubotl bones of 
the tarsus wero fused together, and the metatarsals had united to 
form oa “eannon-boue,” although the metacarpals still remained 
distinet, It is not improbable that upper incisors were wanting ; 
and it has boen suggested that we have in this genus the ancestral 
type of the Cragulide and Cereide, 
TYLOPODA, 
Manily CAMELUDY. 
This group is represented at the present day by the two species 
of Camels of the Old World and the Llamas of South America, 
collectively constituting the family Chanelide, Phe special characters 
which tho Llimas and Camels have in common, and the combina- 
tion of which distinguishes them from the vest of the Artiodaety les, 
areas follows. The promaxillas have the fall aumber of incisor 
tooth in the young state, and the outermost is persistent through 
life as an isolated Taniariform tooth, The canines are present in 
both jaws, and those of the mandible are differentiated from the 
long, procumbent, and spatulate incisors, being subereet and pointed. 
The crowns of the true molars belong to the crescentic or selen- 
odont type, and are very hypsodont; but one or more of the 
anterior prentohus is usually detached from the series, and is 
of simple pointed form. ‘The auditory bulke is filled with cancellous 
tissno, Tho hinder part of the body is much contracted, and the 
fom long and verticnlly plueed, se that the knee-joint is lower 
in position, and the thigh altogether more detached from. the 
abdomen than in most quadrapedal mammals. ‘The limbs are 
Tong, bat with only the third and fourth digits developed ; ioe 
traces of any of the othors being prosent. Tho trapezoid and mag- 
ume of the carpus, and) the cuboid and navientar of the tarsus ave 
distinet. The two metapodial bones of each limb are confluent: for 
the greater part of thet length, Chongh separnted for a considerable 
distanee at the lower end. ‘Pheir distal artienlar stirfiees, mstead 
of being pulley like, with deep ridges and grooves, as in other recent 
Artiodaetyles, ave simple, rounded, and smooth. ‘The proximal 
phaltnges ave expanded at their distal ends, and the wide, depressed 
middle phalanges ave embedded ina broad cutaneons pad, forming 
the sole of the foot, on whieh the animal rests in walking, iste 
ofon the hoofs. The ungnal phakiges are very small and nodular, 
not flattened: on thete inner or opposed surfaces, and noe completely 
oneased ta hoofs, but bearing mails on their upper sturfiee only, 
Tho cervical region is long and flexnous, and the vertebre of which 
it is composed are vetutrkable for the position of the canal for 
