72 R. Lydclikcv — On Fo&dl Mammalia. 



The following table shows the chief dimensions of the specimen. 



Cranium. — Height from lower border of foramen magnum to summit 



of occiput 0'034: 



Length from lower border of foramen magnum to pm. 1. 0-117 



Length of space occupied by last six cheek-teeth 0-047 



„ , , 3 true molars 0-0265 



,, diastema between pm. 1 and pm. 2 0-0205 



,, m. 3 0-0095 



Width,, ,, 0012 



Mandible. — Extreme length 0-114 



,, height at coronoid process 0-0o2 



Depth at m. 3 0-017 



„ pm. 2 0-015 



Length of space occupied by six cheek-teeth 0-052 



,, ,, ,, 3 true molars 0-030 



,, m. 1 0-0085 



,, m. 2 0-0087 



,, m. 3 0-013 



"Width ,, 0-008 



The foregoing comparisons indicate pretty conclusively that the 

 Hordwell fossil as regards dental characters comes nearer to Anthra- 

 cotherium than to Hyopotnmus,^ and although the differences from 

 typical forms of the first-named genus would doubtless be regarded 

 by some palaeontologists as of generic value, the wi-iter being 

 strongly opposed to the multiplication of genera is inclined to refer 

 it to that genus, and it may accordingly be known as A. Gressiyi 

 (Meyer). 



A. Gressiyi must be regarded as a highly specialized species of 

 AntJiracotherium, bearing the same relation to typical species of the 

 genus, as the so-called genera Plesiomeryx and Xiphodontherium re- 

 spectively do to the genera Ceenotheriimi and Xiphodon, in which the 

 writer is disposed to include them. 



The addition of this species to the English Upper Eocene fauna is 

 important, as it affords another instance of the intimate relations 

 existing between the English and Continental Tertiary faunas. It 

 also leads to the conclusion that the Egerkingen beds are closely related 

 in time to the Headon series of Hordwell. The former beds are 

 classed by Dr. Max Schlosser ^ immediately above the Paris Gypsum ; 

 ■while Professor Gaudry ^ places a part of them below the Calcaire 

 Grossier. 



The reference of the present species to Anfh-acotlierium instead of 

 to Hyopotamus, renders it necessary that Tapinodon should for the 

 future be regarded as a synonym of the former, instead of the latter 

 genus. 



CHiEROMERYX SILISTRENSIS (Pcntland). 

 From the Siwalilcs of India. 

 In the Pala3ontologia Indica (ser. 10, vol. ii. pp. 149 166) the writer 



' The circumstance that Anthracni.herium and Mynpoiamtis pass into one another 

 (see Geol. Mag. 1884, Decade III. Vol. I. p. 548) does not affect the present species, 

 as its upper molars are of the typical Anthracothfrium type. 



'^ Palseontographica, vol. xxxi. p. 96 (1884). The writer has recently found that 

 Adapts m'ignti, Filhol, of the Upper Eocene of the Continent, occurs at Hordwell. 



^ Les Enchainements, etc., Mam. Tert. p. 4. 



