432 
PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
Measurements. 
No. 
No. 
No. 
No. 
Type. 
959 6 - 
9597 - 
959 8 - 
9600. 
Length, posterior border of median incisor 
alveolus to Mj inclusive .... 
.014 
.014 
Length of space occupied by vestigial teeth 
and posterior premolar .... 
.005 
.005 
Length of inferior molar series on alveolar 
border . . .... 
.009 
.009 
.009 
Posterior premolar, antero-posterior diameter 
.0014 
.0015 
.0015 
.0015 
“ “ transverse “ 
.001 
.001 
.001 
M t , antero-posterior diameter 
.0035 
.0035 
.0035 
.0035 
.0035 
“ transverse “ . 
.002 
.002 
.002 
M^-, antero-posterior “ 
.0025 
.0025 
.0025 
.0025 
.0025 
“ transverse “ . 
.002 
.002 
.002 
.002 
Mg-, antero-posterior “ . . . . 
.002 
.002 
.002 
.002 
“ transverse “ . 
.0015 
.0015 
.0015 
Mj, antero-posterior “ 
.0012 
Depth of mandible below posterior premolar . 
•0035 
.0035 
“ “ “ “ m t 
•0035 
•0035 
.004 
.0035 
.004 
“ “ “ “ m t 
.004 
PalaEOthentes minutus Ameghino. 
(Plates LXIII, Figs, i, 4-5 a; LXIV, Fig. 2.) 
Palceothentes minutus Amegh. ; Enum. Sist. Especies Mamif. Fos. Pata- 
gonia Austral., p. 6, 1887. 
Epanorthus minutus Amegh. ; Contrib. al Conocimiento Mamif. Fos. Rep. 
Argent., p. 274, PI. 1, Figs. 16-16 a, 1889. 
Paraepanorthus minutus Amegh. ; Enum. Syn., etc., pp. 94-95, Fig. 40, 
1894 ; Bol. Acad. Cordoba, p. 350, Fig. 40, 1894. 
Epanorthus simplex Amegh. ; Enum. Syn., pp. 91-92, 1894; Bol. Acad. 
Cordoba, p. 347, 1894. 
Incomplete lower jaws of six individuals from Killik Aike (Nos. 15,706- 
1 5» 7°9» i5>°68, 15,624) have been identified as belonging to this little di- 
protodont. A maxillary fragment retaining the posterior premolar and the 
molars is associated with one of the mandibles (No. 15,709). Two upper 
molars (No. 15,999) collected by Mr. Hatcher on the south side of the 
Santa Cruz River, sixty miles below Lake Argentina, and part of a left 
mandibular ramus (No. 9122 American Museum) from a locality on the 
Rio Gallegos, are also referable to this species. 
