400 
PATAGONIAN EXPEDITIONS : PALEONTOLOGY. 
strongly deflected toward the inner side of the foot (opposable). Its 
proximal articular surface is convex in dorso-plantar section, fitting a large 
concave facet in the distal end of the entocuneiform. The distal end is, 
unfortunately, missing. The fourth metatarsal is the longest in the pes. 
The proximal articular surfaces of the second, third and fourth are irregu- 
larly triangular, wider on the dorsal than on the plantar margin. Distally, 
these bones are flattened, with moderate keels on the plantar surfaces. 
The fifth metatarsal is missing. 
The short, comparatively flat, astragalar trochlea, moderately interlock- 
ing metapodials and distal spreading of the toes indicate, in the writer’s 
opinion, that A mphiproviverra was plantigrade. The opposable hallux 
and semi-opposable pollex point to arboreal habits. 
The proximal and distal ends of the left fibula are associated with the 
pes just described. Proximally, the shaft is triangular in cross section 
and carries a large facet for the fabella. Distally the fibula resembles the 
corresponding element in Prothy lacy nits. It carries the usual three facets 
for the calcaneum, astragalus and tibia. 
A fragment of the patella associated with the skull of A. minnta (No. 
1 5.373) is hardly complete enough to describe, but is important in demon- 
strating the ossification of the patella in this genus as in Prothylacynus. 
Among living marsupials the patella is ossified only in the Peramelidae. 
The skull represented in figures i, la, Plate LIX (No. 15,154), shows 
an interesting pathological structure, which affords some suggestions of 
the pugnacious habits of these animals. The right upper canine has been 
torn out bodily and the wound has healed, leaving an irregular cavity in 
the side of the face. Wounds similarly received have been noticed in 
the discussion of the genus Borhycena. 
Amphiproviverra manzaniana Ameghino. 
(Plates LIII, Figs, i, i a; LIV, Figs. 5, 6, 11 ; LIX, Figs. 1-2, 4, 5 ; LX, Figs. 1-2 a, 4.) 
Protoproviverra manzaniana Amegh.; Nuevos Restos Mamifi Fos. Pata- 
gonia Austral., pp. 26-27, Aug., 1891 ; Revista Argentina, etc., I, 
entr. 50, pp. 3 12-3 13, Oct., 1891. 
Amphiproviverra manzaniana Amegh.; Enum. Syn., etc., p. 133, fig. 
52, p. 134, 1894; Bol. Acad. Cordoba, p. 389, fig. 52, p. 390, 1894. 
Apart from size, there is hardly a character which will serve to distin- 
