THE HIND FEET. 155 



face for the fourth metatarsal is mncli the largfer. It is narrow, or pointed, 



below, and moderately concave, or, in the lower part, slightlv convex, 



from above downward, and is at riyht ang-les witli the axis of the bone. 



The smaller outer face, sixpporting- the tifth metatarsal, is turned somewhat 



outward, and is slightly convex in both directions. 



The ])rinci)ial dimensions of the two cuboid bones above described 



are as follows : 



Mensurements of Left Cxhold. (Dinoefras mirtibile^l^o. 1208.) 



m. 



Length of cuboid, along axis of foot, _ .(i:?5 



Transverse diameter, . -. . .054 



Antero-posterior diameter, -.. . .- __ .060 



Antero-posterior diameter of face for astragalus, _ . .0,5.5 



Transverse diameter of face for a.stragalus, ... .034 



Antero-posterior diameter of face for culioid, .035 



Transverse diameter of face for cuboid, .__ .OiiO 



Antero-posterior diameter of face for fourth metatarsal, .049 



Transverse diameter of face for fourth metatarsal, . . - _ .033 



Antero-posterior diameter of face for fifth metatarsal, . .035 



Transverse diameter of face for fifth metatarsal, ... . . .022 



Measurements of Right Ciihoul. [Dtnoeeras ntirahile. No. 1528.) 



ra. 



Length of cuboid, along axis of foot, ...- .037 



Transverse diameter, — 066 



Antero-posterior diameter, .._. . .. .. .065 



Antero-posterior diameter of face for astragalus, --. 058 



Transverse diameter of face for astragalus, ._- • . .036 



Antero-posterior diameter of face for cuboid, .032 



Transverse diameter of face for cuboid, 026 



Antero-posterior diameter of face for fourth metatai-sal, .049 



Transverse diameter of face for fourth metatarsal, . .035 



Antero-posterior diameter of face for fifth metatarsal, ■ .039 



Transverse diameter of face for fifth metatarsal, . .032 



The Navicular. 

 (Plate XLIX, figures 7-12, and Plate LTV, figure 2, n.) 

 The navicular is a short bone in the Binorerafa, strongly flattened 

 vertically, much as in the elephant. It is supported b}^ the astragalu.s, 

 and does not usually, as in that animal, touch the calcaneura. It supports 

 oiilv the three cuneiform bones in front, but presents a narrow, lateral, 

 artievdar face to the cuboid. 



