172 
TERTIAET VERTEBRATA OF THE FAYtTM. 
I N c: E R T S E D I S. 
Family BARYTHERIIUyE. 
This family is known only from a single genus, Banjtherium, 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 
])a])er * it was suggested that possibly it may he found to constitute a subdivision 
of the Amhlypoda, which would be of the same rank as the Dinocerata and might he 
called the Barytheria. 
Genus BARYTHERIUM, Andrews. 
[‘ Nature,’ Oct. lOtli, 1901, vol. Ixiv. p. 577; also Geol. Mag. [4] vol. viii.(1901) p. 52<S.] 
1901. Bradytheriiim, C. W. An Jrews, Tageblatt des V. Internationalen Zoologen-Congresses Berlin, 
No. 6, p. 4 ; also Geol. Mag. [4] vol. viii. p]). 407-8, figs. 3-4 (September) ; also the 
‘ Zoologist,’ p. 319. [Name preoccupied in March 1901 by O. Grandidier tor a genus 
o£ extinct Edentates from Madagascar (Bull. Mus. d’Hist. Nat. Paris, vol. vii. p. 55.] 
1902. Barytherium, 0. W. Andrews, Verhandlungen des V. Internationalen Zoologen-Oongresses 
Berlin, p. 528. 
The dental formula, so far as known, is : ?. j- c. y, 2 )m. o, m. 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. 'I'he 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. 
67cull (PI. XVII. fig. 4). — 4’he only |)ortions of the skull at ])resent known are jiarts 
of the right and left maxillge hearing the cheek-teeth. On the left side the zygomatic 
])rocess {zy<].) is preserved: it is of great width, its base extending from above the 
anterior lobe of m. 1 to the middle of pni. 2, a distance of about 13 cm. ; its ^ entral 
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 imperfect, 
it may have been considerably wider even than is shown in the figure. 
U])i)er Dentition (PI. XVII. fig. 4). — Of the u[)per teeth 2-4 and w/. 1-3 are 
jrresent on the left side; the premolars, especially ymr. 2, are imperfect on their inner 
side and the crowns of all the teeth are greatly worn. Dm. 2 seems to have been more 
* “Note on the Barypoda, a new Order of Ungulate .Mainiiials,” Oeol. Mag. [5] vol. i. 1904, p. 182. 
