ORDER UNGULATA. 1 383 



tween the fibula and astragalus. This suborder is represented solely 

 by the family Hyracidce, containing the two existing genera Hyrax 

 (fig. 1256) and Dendrohyrax ; both of which are confined to Africa 

 and Syria, and are unknown in a fossil condition. The dental 



formula of the adult is I. -, C. -, Pm. -, M. - ; there are four 



10 4 3 



milk-molars ; the incisors grow from persistent pulps, and the pattern 

 of the cheek-teeth is of a Rhinocerotic type. The fore-feet have 



Fig. 1256. — Left lateral aspect of the skull of Hyrax ca/ensis. Reduced. 



three, and the hind ones four digits ; and the terminal phalangeals 

 (except in the inner digit of the pes) have rounded hoof-like nails. 

 The coracoid process of the scapula is well developed •; there is no 

 entepicondylar foramen to the humerus ; the femur possesses a small 

 third trochanter ; and the tibia and fibula are distinct. 



Suborder 6. Amblypoda. — In this suborder, which comprises 

 primitive Ungulates of great bulk from the Eocene of Europe and 

 North America, the carpus (fig. 1257, b) is characterised by the 

 scaphoid being supported by the trapezoid and not by the magnum, 

 while the latter and the unciform support the lunar ; in the tarsus 

 the cuboid articulates with both the calcaneum and astragalus. The 

 carpus is therefore of a more primitive type than the tarsus. Both 

 the carpal and the tarsal bones interlock to a slight extent (fig. 1257,, 

 b, c) ; the astragalus is flat (fig. 1257, c) ; the feet are short, planti- 

 grade, and furnished with five digits ; and the fibula articulates with 

 the calcaneum. The brain (fig. 1257, a) is very small in propor- 

 tion to the cranium. The cheek-dentition (fig. 1258) is of a primi- 

 tive lophodont type ; the crowns of all these teeth being very shorty 



vol. 11. 2 1 



