Art. LIIL— On ^ 



The lower Eocene deposits of England and France have 

 yielded a few remains of an interesting genus of ungulate 

 mammals to which Owen, in 1846, gave the name Coryphodon.* 

 Hebert subsequently published a memoir on the subject, in 

 which he figured and described the more important specimens 

 found in Francaf Although comparatively little is yet known 

 in Europe of the structure or near affinities of these animals, the 

 portions preserved are characteristic, and the genus is well 

 marked. The geological horizon, also, is fully determined, 

 viz : tbe London clay of England, and, in France, the base of 

 the Argile plcisiique. 



While in Wyoming with the Yale College exploring party 

 in 1871, the writer had his attention called to a deposit at the 

 base of the Eocene containing mammalian remains, and subse- 

 quently obtained a number of the fossils, mainly through the 

 kindness of Wm. Cleburne, Esq., who sent other specimens to 

 the Academy of Natural Sciences in Philadelphia. Some of the 

 latter fossils were described by Prof. Cope as Bathmodon radians 

 and B. semicinctus ; and in the same paper another generic 

 name, Loxolophodon, was proposed for the same lower molar 

 named as the second species.^ Since this time, other similar 

 remains have been found in Utah and New Mexico, and their 

 principal characters can now be determined. 



of an interesting series of these fossils now 



„ ^v.ov.xw..w Kjj ^iwx. vyope, clearly shows that they all 



belong to the genus Cm-yphodon of Owen. This is especially 

 important, as the geological horizon of the remains is essentially 

 tne same in both countries, and the American specimens prom- 

 ise to clear up many doubtful points in regard to the animals 

 themselves. One of the specimens in the Yale collection is a 

 nearly perfect skull, representing an undescribed species 



* British Fossa Mammals and Birds, p. 299. 



t Anuales des Sciences NatureUes, tome vi, p. 87, Plates III and IV, 1856. 



X Proceedings American Philosophical Society, p. 420. 1872. 



