TKiri'IARY VEliTEliRATA OF THE EAYCM. 
‘J3G 
l lioreforc' intermediate between tlie horizons oi Protocetiis atavus and Zeu.glodon osiris \ 
as niio-ht be ex])ected, it exhibits some interesting transitional characters in the teeth. 
Anotlier s])ecimen from tlie same horizon is a large mandible here described as the 
ty])e oi Zeuijlodoii his. From the remains ot‘ Z. osiris collected by Mr. Beadnell and 
myself in the C.iasr-el-Sagha series it is not possible to add anything of importance to 
Stromer’s detailed descriptions. 
G'en us ZEUGLODON, Owen. 
[Loiul. & EJinb. I’liil. Mag. (3) vol. xiv. (183'.)) i).''302.] 
Dental formula : — i. i] ; c.\ \ pm. ^ ; m. . Teeth with not more than two roots, 
('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. 
Zeuglodoil osiris, Dames. 
[Plate XX. tigs. 8, 8 a ; text-tig. 77.] 
1801. Ze^Kjlodon. oyiris, 
1001 . 
1002 . 
'I’f 
1003). 
1 003. 
1003. 
51 
loot. 
W. Dames, Pakeont. Abliandl., n. s., vol. i. p. 204, pis. xxx., xxxi., xxxiv.- 
xxxvi. 
(J. W. Andrews, Geol. Mag. [4] vol. viii. p. E»7. 
E. tStromer, Bitzungsb. matb.-jdiys. Cl. k. bay. Akad. Wiss. vol. xxxii. 
p. 345. 
E. Stronier, Zeitsebr. deut.scli. geol. Cescdl., Prolok(dl(‘, vol. 55, p. 37. 
(t. Elliot Bmitb, Proc. Roy. Boo. vol. 71, p. 322. 
E. Btromer, Peitr. Pal. u. Geol. Gesterreicb-Ungarns u. d. (Orients, vol. xv. 
]). (15, pis. viii.-xi. 
E. Eraas, Pakeont. Abliandl. , n. s., vol. vi. p. 10'.). 
Type Specimen . — Portions of premaxillag left ramus of mandible, and some 
vertebra?, described and figured by Dames, torn. cif. 1804, pp. 101-7104, pis. xxx., 
xxxi., xxxiv.-xxxvi. ; Royal Museum of Natural History, Ikulin. 
In this s]')ecies the dental formula is; i. c*. j ; ynii. p, m. ]. The lirst ])rem()lar 
is one-rooted. Molars crowded together. The sipiraoccipital surface is narrow and 
very deeply concave from side to side, owing to the turning backwards of the sides ot 
the prominent lambdoidal crest (see PI. XX. tig. 8). For detailed descrijitiou of tlu' 
skull and mandible, see Stromer’s memoirs referred to above. 
Furm. ct- Jmc. — (Jasr-el Sagha beds (.Middle Eocene); north of Birket-el-Qurun. 
