92 MEMOIES OF THE CARNEGIE MUSEUM 



is very small and is situated on the lower antero-internal angle, the second and 

 larger is triangular in outline and occupies the antero-median portion of the in- 

 ternal border. On the supero-posterior angle there is a small surface for contact 

 with the navicular, while extending all along the supero-internal border is a surface 

 for the head of the astragalus. On the tibial side there is a well-developed tuberos- 

 ity running obliquely across the surface of the bone. This is separated from the infe- 

 rior and dorsal surfaces by a deep groove for the -peroneus longus. These conditions 

 are just such as obtain in the cat, but quite diflPerent from those found in the dog. 



The ectocuneiform is in general cat-like, but with a number of distinctive char- 

 acters. The distal surface is more distinctly concave antero-posteriorly and trans- 

 versely, and the posterior projection is not so much constricted. On its external 

 side it articulates with the cuboid and metatarsal IV. Internally, besides articulat- 

 ing with the mesocuneiform, it has an extended contact with metatarsal II. Supe- 

 riorly it articulates with the external one half of the inferior surface of the navic- 

 ular. The process of the posterior surface is less hooked than in the cats and decid- 

 edly more like that of the dogs. 



The mesocuneiform is much the smallest bone of the tarsus. It is wedge-shaped 

 with the apex directed posteriorly. Both the superior and inferior surfaces are con- 

 cave, the former articulates with the navicular, the latter with metatarsal II. Exter- 

 nally it articulates with the superior one half of the internal side of the ectocunei- 

 form, internally with the superior portion of the external surface of the entocunei- 

 form. 



The entocuneiform does not differ materially from that bone in recent carnivores. 

 It is elongated vertically and wedge-shaped antero-posteriorly. Externally it artic- 

 ulates with metatarsal II. and the mesocuneiform, proximally with the navicular, 

 and distally it gives support to metatarsal I., which is much less reduced than in 

 the recent dogs and cats. 



The navicular in Daphosnus is low as in the cats. The superior surface is deeply 

 concave for the reception of the convex head of the astragalus. Inferiorly it artic- 

 ulates with all three of the cuneiforms, but the articular surfaces for each are only 

 indistinctly differentiated. There is a pronounced posterior tuberosity. 



The Metatarsus. — PI. XVIII. , Fig. 9. The bones of the metatarsus interlock much 

 more perfectly than do those of the metacarpus. While differing in some of its 

 details from that of the cats, the metatarsus is decidedly feline rather than canine. 

 This is seen in the greater development of the tuberosity of metatarsal V.; in the 

 more produced proximal portion of metatarsal II., so as to articulate or cover 

 throughout one half its length the inner surface of the ectocuneiform, and in the 



