Cope : in the Insectivora, as an annectant form between Erinaceus 

 and TiUotherium, but was subsequently 2 referred to the same family 

 as Dsltatherlum 3 . The latter view is not accepted by Schlosser 4 , 

 \vho regards the genus as allied to the Tillodontia. In Esthon>/xihe 

 dentition (woodcut, fig. 2), is I. f, C. }, Pin. |, M. f. The larger 

 pair of incisors are scalpriform, but do not grow from persistent 

 pulps ; the cheek-teeth are very similar to those of Anchippodus. 



It will be obvious that the systematic position of Platychoerops 

 entirely depends on its apparent relationship to Esthonyx*. 



Genus PLATYCHCEROPS, Charles worth 6 . 

 Syn. Miolophns, Owen 7 . 



Platy cheer ops richardsoni, Charlesworth 8 . 

 Syn. M iolophus planiceps, Owen 9 . 

 Hob. Europe (England). 



M. 3566. Cast of the imperfect palate, showing rn. 2 and m. 3 on 

 both sides, the right P^, and the alveoli of pm. 3 and 

 m. 1 of the two sides. The original, which is the type of 

 the genus and species, is preserved in the Museum at 

 York, and is described and figured by Owen, op. cit. pi. x. 

 fig. 1, as Miohjphits planictpa ', it was obtained from the 

 London Clay of Herne Bay, Kent. 



Made in the Museum. 



1 Vertebrata of the Tertiary Formations of the West (Eep. U.S. Geol. Surv. 

 Terr. vol. hi.), Book i. p. 197 (1884). 



2 Amer. Nat. vol. xviii. p. 480 (1884). 



3 Vide infra, Supplement. 



4 Morphol. Jahrb. vol. xii. p. 288 (1886). 



6 Since the above was written, the author has received a letter from Mr. H. 

 F. Osborn, of Princeton, New Jersey, who during a recent visit to England 

 examined the cast of Platychoerops, in which he states his opinion, after an 

 examination of the American specimens of Esthonyx, that the latter is not 

 generically separable from the former. 



6 Eep. Brit. Assoc. for 1854 Trans, of Sections, p. 80 (1855). 



7 Geol. Mag. dec. 1, vol. ii. p. 339 (1865). 



8 Loc. cit. fl Loo. cit. 



