TI'lRTIAIiY VEKTEBHATA OF TJIE FATtM. 
‘JJO 
Zeilglodon isis, Beadnell, MS. 
[Text-fig. 78.] 
1001. Zoihjlodon C. W. Andrews, Gt'ol. Alag. [5] vol. i. pp. 214-r). 
J 005. „ ,, 11. J. L. Ecadnell, The To[)()gra])liy and Geology of the F’ayuni Province, p. 44 
(Survey D(^[)artinent, Cairo). 
Type Specimen .- — Right ramus of mandible, complete as far as the hinder end of 
the molar series (text-Hg. 78) ; Geological Aluseum, Cairo. 
This is a very large s])ecies, the distance from the anterior end of the mandible to 
the posterior border of the last molar being about 77 cm. against 48 cm. in Z. osiris. 
It is distinguished from tlie contemporary Eoccfn,s sclnvei'nfnrtlii in having the molars 
and premolars serrated. The full dentition is present in the mandible, and the first 
})remolar is one-rooted. 
Form. Loc. — Rirket-el-Qurnn beds (Aliddle Eocene): west of Birket-el-Qurnn. 
The occurrence of large Zenglodonts in beds beneath the Qasr-el-Sagha series, 
in which the types of Z. osiris were found, was noticed by Dames'* * * § in his account of 
Schweinfnrth’s first collection, which came from the island Geziret-el-Ciorn in the lake 
Birket-el-Qurun : the beds in which this collection was made are placed by Beadnell 
in the Birket-el-Qurun series. The existence of this large species was afterwards 
referred to by myself f and by Stromer J. Recently, Dr. E. Eraas has described a 
large Zeuglodont Irom beds of the same age, and has made it the type of a new genus 
and specii's Eoccftis sch'weinfurfiii stating that in several respects it is more primitive 
than Zevyiodon and in some respects intermediate between it and Protocetiis. The 
teeth are described as secodont with a reduced inner tubercle, the edges of the crowns 
not being serrated as in Zevyiodon ; the full dentition is present in the upper jawe 
Dr. Eraas also refers to this species the large vertebne from the same horizon. These, 
however, he admits are closely similar to those of the larger American Zenglodonts. 
A number of these large vertebrae wmre collected near Dime in 19U0 by Mr. Beadnell 
and myself, and subsequently he obtained near the western end of Birket-el-Qnrun a 
fine mandibular ramus of very large size with the teeth of typically Zeuglodont 
form. I'he dental hninula is : i. 3, c. 1, jwi. 4, m. 3. This animal, from its tooth- 
structure, cannot be the same as Eocetus sehweinfiirlhi, although of similar size and 
from about the same horizon. In his notes, Mr. Beadnell referred to this species as 
* Hit/.ung.sb. 1<. [)reus.s. Akad. Wi.ss. vol. i, (ISSR) pp. lAO-ia.I. 
t (tool. IMag. [.b] \(;1. i. ])p. 21-t-n. 
X Itcitr. Fill. u. (teol. Oc.stiMrcicli-Pngarn.s ii. d. Orii'id.s, vol. .\v. (litOA) j). 82. 
§ OrigiiKilly Mesocetus scliireivfnrt/ii ' I’aUcont.. A liliandl., n. s , \'ol. \ i. (li)Od) p. 217), but Jilenocctux baling 
been previously employed, the author chiinged it to /uiccltis ((uiol. (’entralblatl , vol. v. (lOttl) no. 10-J8). 
