430 
PATAGONIAN EXPEDITIONS : PALAEONTOLOGY. 
Amegh. Coll . 
Mg-, antero-posterior diameter ........ .003 
M ? , “ “ 002 
Depth of mandible below M T ........ .0075 
“ “ M ? 008 
Pal/EOthentes intermedius Ameghino. 
(Plates LXIII, Figs. 3, 7 ; LXIV, Figs, 1, 1 a.) 
Palceothentes intermedius Amegh. ; Enum. Sist. Especies Mamif. Fos. Pata- 
gonia Austral, p. 6, 1887. 
Epanorthus intermedins Amegh.; Contrib. al Conocimiento Mamif. Fos. 
Rep. Argentina, p. 274, PI. I, Figs. 15-152, 1889. 
Metaepanorthus intermedius Amegh.; Enum. Syn., etc., p. 92, 1894; Bol. 
Acad. Cordoba, p. 348, 1894. 
An incomplete skull (No. 15,225) collected by Mr. Peterson from the 
Lower Santa Cruz beds five miles south of Coy Inlet, and two maxillary 
fragments (No. 15,952; American Museum, No. 9550), from Killik Aike 
and Santa Cruz respectively, apparently belong to this species, agreeing 
closely with the measurement given by Ameghino (1894, p. 92) for the 
premolar-molar series. The important features of the skull and teeth have 
already been mentioned in characterizing the genus. 
So far as can be judged from the small amount of material available, 
the size of mature individuals is fairly constant. The upper premolars 
are all double-rooted, without intervening diastemata. The anterior pre- 
molar is in contact with the canine. An exceedingly small anterior ac- 
cessory basal tubercle is present on the upper sectorial in unworn teeth. 
The species is considerably larger than P. lepidus , occupying in point of 
size a position intermediate between that species and P. aratce. 
Measurements. 
No. 15,225. No. 15,952. 
Length of upper premolar-molar series meas- 
ured as chord of arc . . . . 
Length of space occupied by upper premolars 
“ “ “ “ “ molars . 
Anterior premolar, antero-posterior diameter 
“ “ transverse “ 
antero-posterior “ 
No. 9550. 
.015 
.015 
.0075 
.0074 
.0085 
.OO85 
.0018 
.0008 
.002 
.002 
Median 
