172 
TERTIAEY VERTEBRATA OF THE FAYtlM. 
I N c; E K T a: S E D I s. 
Family FARYTHERIIDvE. 
Fills family is known only from a single genus, Barytherium, the characters of 
which are given below. Its systematic position is still very doubtful and it does not 
fall within the limits of any of the suborders as at present defined. In a former 
jiaper * it was suggested that possibly it may be found to constitute a subdivision 
of the Amblypoda, which would be of the same rank as the Dinocerata and might be 
called the Barythevia. 
Genus BARYTHERIUM, Andrews. 
[‘ Nature,'’ Oct. lOtli, 1901, vol. Ixiv. p. 577; also Geol. Mag. [4] vol. viii.(1901) p. 528.] 
1901. Bi'adythenum, C. W. Andrews, Tageblatt des V. Internationalen Zoologen- Congresses Berlin. 
No. 6, p. 4 ; also Geol. Mag. [4] vol. viii. pp. 407-8, figs. 3-4 (September) ; also the 
‘ Zoologist,’ p. 319. [Name preoccupied in IMarch 1901 by G. Grandidier for a genus 
of extinct Edentates from Madagascar (Bull. Mus. d’Hist. Nat. Paris, vol. vii. p. 55.] 
1902. Barytherium, C. W. Andrews, Verhandhmgen des V. Internationalen Zoologen-Congresses 
Berlin, p. 528. 
The dental formula, so far as known, is: i. c. pm. ^ m. 3 . The first lower 
incisor is a large procumbent tusk in contact with its fellow in the middle line, and 
separated from the anterior premolar by a long diastema ; the molars of both jaws are 
bilophodont, the last lower molar having a talon. The mandible is extraordinarily 
massive, the symphysis being very long and deep ; on its ventral border there is a pair 
of blunt tuberosities. The anterior border of the ascending ramus rises on the side of 
the jaw beneath m. 2. The humerus is very massive, with greatly expanded distal end, 
in which all the muscle-ridges are strongly developed. 
Skull (PI. XVII. fig. 4). — The only portions of the skull at present known are parts 
of the right and left maxillae bearing the cheek-teeth. On the left side the zygomatic 
process {zf/g.) is preserved: it is of great width, its base extending from above the 
anterior lobe of m. I to the middle of pm. 2, a distance of about 13 cm. ; its ventral 
edge is nearly parallel to the alveolar border and very little above it; its upper surface 
is completely cut away by sand-drift, and, the anterior edge being somewhat im[)erfect, 
it may have been considerably wider even than is shown in the figure. 
Upper Dentition fig. 4). — Of the up))er teeth pin.'"!-^ and 1-3 are 
present on the left side ; the premolars, es])ecially pm. 2 , are itn))crfect on their inner 
side and the crowns of all the teeth are greatly worn. Bm. 2 seems to have been more 
* “Note oil the Barypoda, a new Order of Ungulate IMainnials,’’ Geol. Mag. [5] vol. i. fOOl, p. 482. 
