210 
THiri'IARV VEliTEEKATA OE TEE FAYtAI. 
Zeuglodon isis, Beadnell, MS. 
[I'ext-fig. 78.] 
IlH)!, Zeti>jlodon i.dia, 0. W. AikIih'ws, Gcol. [5] vol. i. ])]). 211 A. 
l'.)()5. „ „ II . J. L. Ilciidiu'll, Tho Topography ami Gou'.ogy ol' tlie Fayuin Province, p. 44 
(Survey 1 )(‘partnient, (Giro). 
Type Specwicn . — llight ramus of mandible, complete as far as the hinder end of 
the molar series (te.\t-tig. 78); Geological Musenm, Cairo. 
This is a very large si)ecies, the distance from the anterior end of tlie mandilde to 
the posterior border of the last molar being about 77 cm. against 48 cm. in Z. osiris. 
It is distinguished from the contemporary Eocetus sclmeiiifurtJii in having the molars 
and prcmolars serrated. Tlie full dentition is present in the mandible, and the first 
prcmolar is one-rooted. 
Form. hoc. — Birket-el-Quvun beds (Middle Eocene) : west of Birket-el-Qurun. 
The occurrence of large Zeuglodonts iii beds beneath the (4asr-el-Sagha series, 
in which the types of Z. osin's were found, was noticed by Dames ^ in his account of 
Schweinfurth’s first collection, which came from the island Geziret-el-(.forn in the lake 
Birkct-el-(4urun : the beds in which this collection was made are placed by Beadnell 
in the Birket-el-Qurun scries. The existence of this large species was afterwards 
referred to by myself f and by Stromei- J. Ifeccnfly, 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 species Eocehis stating that in several respects it is more primitive 
than Zeufjludon and in some respects intermediate between it and Protocetus. The 
teeth are described as sccodont with a reduced inner tubercle, the edges of the crowns 
not being serrated as in Zevylodun ; the full dentition is present in the upper jaw. 
Dr. E raas also refers to this species the large vertebrm from the same horizon. These, 
however, he admits are closely similar to those of the larger American /ieuglodoiits. 
A number of these large vcrtebric were collected near Dime in 1900 by Mr. Beadnell 
and myself, and std)sequcntly he obtained near the western end of Birket-el-tfurun a 
fine mandibular ramus of very large size with the teeth of typically Zeuglodout 
form. The dental formula is: /. 3, c. 1, pm. 4:, ni.?j. 4'his animal, from its tooth- 
structui-e, cannot be the same as Eocettos .sc/iwe/nfnrf/ii, although of similar size and 
from about the same horizon. In his notes, Mr. Beadnell referred to this s])ecies as 
■* sit zungsl). k. |)r(‘uss. .Vkad. Wiss. vol. i. (188:3) pj). i:t() I:).'). 
4 (icol. Aliig. [.t] 'ol. i. ])p. 214-'), 
i Itcitr. J’.al. u. (ii'ol. ( )c,si(‘trcicli-l’ngMrns ii. d. Oriends. vo], w. (I!K)I3) p. 82. 
§ ( )i'igiii;dly Mcsocetnif sc/iirriii/nii/ii ! I’lda'Diil . A Mia ndl., n. s , \ (d. x i. ( 1 00-1) p. 217), luit J/fMccfn.'i liax iiig 
tiuvii prex iously oin{)lf,'yod, tln‘ .'UiOidi' cdiaiigod it to /'\irrti(s ((Icid. ('oiitralblatl , xad. v. (lOO-l) no. l()-i8). 
