376 PATAGONIAN EXPEDITIONS: PALEONTOLOGY. 



Fibula, length 164 



" antero-posterior diameter of proximal end ..... .020 



" distal " 0175 



Astragalus, length ........... .026 



" width of trochlea . . . . . . . . . .019 



" " " neck ......... .009 



Metatarsal I, length 0245 



" " width of proximal end ........ .008 



" " " distal " 0065 



Metatarsal III, length 037 



" " width of proximal end ....... .0075 



" " distal " . 012 



CLADOSICTIS Ameghino. 



(Plates LII, Fig. 4; LIII, Figs. 3, 30, 10; LIV, Figs, i, 3, 4, 10, 12; LV-LVIII; LIX, Figs. 



'; LXI, Fig. i.) 



Cladosictis Amegh. ; Enum. Sist. Especies Mamif. F6s. Patagonia Austral, 



p. 7. 1887. 



Hathliacynus Amegh. ; Ibid., p. 7, 1887. 

 Anatherium Amegh.; Ibid., p. 8, 1887. 

 Proviverm (Rutimeyer) Amegh.; Revista Argentina, etc., I, pp. 149-150, 



1891. 



Dolichocephalic thylacynes intermediate in size between Amphipro- 

 viverm and Frothy lacymis. 



Dentition (Pis. LIV, fig. i ; LV, figs, i, 3; LVI, figs, i, 3; LIX, figs. 



6-7*)- 



The median incisors (PI. LV, fig. 3) are laterally compressed, unlike 



the corresponding teeth in Dasyurus, DidelpJiys and Amphiproviverra. 

 The remaining incisors, so far as preserved, have laterally compressed 

 crowns, and increase regularly in size externally. The crowns of the 

 lateral pair are triangular in cross section. In all the specimens examined, 

 the incisors are badly worn, reducing the crowns to irregularly truncated, 

 flattened columns. The canines are stout, laterally compressed blades, 

 the posterior margins of which are almost straight, while the anterior 

 margins are moderately convex. The anterior and median upper pre- 

 molars are spaced in both species. The median and posterior premolars 

 are spaced in C. petersoni, unspaced in C. lustratus. The anterior pre- 

 molar is separated by a short interval from the canine. Its crown is a sim- 



