23G 
TERTIARY VERTERIiATA OE THE FATtlAI. 
i heveforc intermediate Lctween tlie horizons of Vrotocetus atcmis and Zeuglodon odris\ 
as might he expected, it exhibits some interesting transitional characters in the teeth. 
Another specimen from the same horizon is a largo mandible here described as the 
type of Zettglodon ids. From the remains of Z. osiris collected by Mr. Beadnell and 
myself in the (iasr-el-Sagha series it is not possible to add anything of importance to 
Stromer’s detailed descriptions. 
Genus ZEUGLODON, Owen. 
[Load. & EJiiib. Phil. Mag. (3) vol. xiv. (1839) p.'302.] 
3 1 4 2 
Dental formula ; — ?. ^ ; c. j- ; pm. ^ ; 7n. 2 ^ 3 • Teeth with not more than two roots. 
C’heek-teeth with a laterally compressed crown — that of the premolars always strongly 
serrated on both edges, that of the molars serrated on both or only on the posterior 
edge. 
Zeuglodon osiris, Dames. 
[Plate XX. tigs. 8 , 8 a ; text-tig. 77.] 
1894. 
Zeuglodon i 
oslri 
h’, W. Dames, Paloeont. Abhandh, n. s., vol. i. p. 204, pis. xxx., xxxi., xxxiv.- 
xxxvi. 
1901. 
G. W. Andrews, Geol. Mag. [4] vol. viii. p. 437. 
1902. 
99 
E. Stromer, Sitzungsb. math.-})]iys. Cl. k. bay. Akad. AViss. vol. xxxii. 
p. 345. 
190;h 
99 
99 
E. Stromer, Zeitschr. deut.sch. geol. (lesell., Protokolk', vol. 55, ]). 37. 
1903. 
99 
99 
G. Elliot Smith, Proc. Poy. Soc. vol. 71, ]>. 322. 
1903. 
99 
99 
E. Stromer, Beitr. I’al. u. Geol. Oesterreii h-Ungarns u. d. Orients, vol. xv. 
]). (15, ])Is. viii.-xi. 
1904. 
99 
99 
E. Eraas, Palmont. Abhandh, n. s., vol. vi. p. 199. 
Ttjpe Specimen . — Portions of premaxilhe, left ramus of mandible, and some 
vertebra}, described and figured by Dames, tom. cit. 1804, ])[). 101-204, ])ls. xxx., 
xxxi., xxxiv.-xxxvi. ; Itoyal Museum of Natural History, Px'ilin. 
In this species the dental formula is: i. c. | m. The first ])reni()lar 
is one-rooted. Molars crowded together. The su])raoccipital surface is narrow and 
very deeply concave from side to side, owing to the turning backwards of the sides of 
the ])rominent hirnbdoidal crest (see PI. XX. fig. 8 ). For detailed description of th(> 
skull and mandible, see Stromer’s memoirs referred to above. 
Form, tf' IjOC . — (Jasr-el Sagha beds (Middh' Eocene): north of Biiket-el-(2iirun. 
