254 TJNGTTLATA. 



Hyotherium typum (Pomel 1 ). 



Syn. Choeropotamus meissneri, H. v. Meyer 2 . 

 Hyotherium meissneri, H. v. Meyer 3 . 

 Palceoch<xrus typus, Pomel 4 . 

 Palceochcerus suillus, Pomel 5 . 

 Hyotherium suillum, Filhol 8 . 

 Amphichoerus typus, Bravard, MS. 



Peters, in the Denkschr. k. Ak. Wiss. vol. xxix. p. 214 (1869), 

 identifies H. typum with H. meissneri, and the specimens in the 

 Museum indicate that this is probably correct ; the latter species 

 was, however, never properly defined, and it therefore seems best to 

 adopt the former name, which is in very general use. Peters also 

 identifies with this form the so-called Choeromorus simplex from 

 the Middle Miocene of Sansan ; but this view is not borne out by 

 the specimens in the Museum. If H, typus and H. meissneri be 

 really the same, the range of the species extends from the Upper 

 Eocene of Caylux to the Middle Miocene of Elgg, and Georgens- 

 gmiind 7 . 



Hob. Europe. 



M. 2198. Part of the palate ; from the Middle Miocene of Elgg 

 (Zurich), Switzerland 8 . This specimen shows the three true 

 molars of either side, in an early stage of wear ; from the 

 locality whence it was obtained it may probably be regarded 

 as belonging to the typical H. meissneri. The length of 

 the space occupied by the three true molars is 0,0365, 

 and the interval between m. 3 of opposite sides 0,022. 

 The former dimensions agree very closely with that of 

 the specimen figured by P. Gervais in the Zool. et Pal. 

 Erangaises, 2nd ed. pi. xxxiii. fig. 1, under the name of 

 Palceochcerus typus. Purchased, 1885. 



1 Catalogue Methodique, p. 87 (1853), Palaochcerus. 



2 ' Die fossilen Zahne und Knochen von Georgensgmiind,' p. 51 (1834). From 

 the context there is evidently some earlier occurrence of the name, which the 

 writer has not found. 



3 Neues Jahrb. 1841, p. 104. 4 Catalogue Methodique, p. 87 (1853). 

 5 Loc. cit. 



8 Ann. Sci. Geol. vol. xi. art. 1, p. 14 (1880; vol. dated 1881). 



7 In the table on page x of Part I. of this work, the writer followed Max 

 Schlosser in placing the Georgensgmiind beds in the Upper Miocene ; its Mam- 

 malian fauna appears, however, to indicate that it should rather be placed in 

 the Middle Miocene. See Introduction. 



8 The Elgg beds are not mentioned in the table on page x of Part I. of this 

 work. They are placed by Max Schlosser in the same horizon as those of 

 Kapfnach. 



