302 SUPPLEMENT. 



42824. The palatal half of the cranium, exhibiting the whole of the 

 (Fig.) dentition ; from the Upper Miocene of (Eningen, Switzer- 

 land. The type specimen ; figured by the writer in the 

 ' Quart. Journ. Geol. Soc.' vol. xlii. pi. ii. figs. 3, 4. 



Van Breda Collection. Purchased, 1871. 



Genus NEUROGYMNURUS, FilhoP. 

 Dentition: 1. 1 C. \, Pm. J, M. f. 



This genus, with which Cayluxotherium, Filhol 2 , is probably 

 identical, is allied to Gymnura, but has no cingulum in the lower 

 true molars, while the premolars differ, and in the cranium (Cayluxo- 

 therium) palatal vacuities are present. 



Neurogymnurus minor, Filhol 3 . 



This species is somewhat smaller than the typical N. cayluxi, 

 the length of the lower true molars being 0,006. 

 Hob. Europe (France, and (?) England). 



M. 2388 g. The nearly entire right ramus of the mandible, showing 

 ^n74 and the alveoli of the other cheek-teeth and canine ; 

 from the Phosphorites of Caylux(Tarn-et-Garonne), France. 

 Type mandibles figured by Filhol in the ' Ann. Soc. Sci. 

 Phys. Nat. Toulouse,' 1884, pi. i. figs. 13, 15. 



Purchased, 1885. 



M. 2813. An upper true molar, provisionally referred to this species ; 

 from the Upper Eocene (Lower Oligocene) of Headon Hill, 

 Isle of Wight. This tooth agrees with the upper molars 

 of Cayluxotherium elegans figured by Filhol, op. cit. pi. i. 

 figs. 9-12, but is of smaller size. 



Presented by J. E. Lee, Esq., 1885. 



Neurogymnurus major, Lydekker (n. sp.). 



Larger than N. cayluxi, the length of the lower true molars being 

 0,0115 (against 0,009), and the depth of the mandible behind inTs 

 0,0095 (against 0,004). The molars are relatively shorter than in 

 Gymnura. 



Hob. Europe (England). 



29718. Two imperfect mandibular rami ; from the Upper Eocene of 

 Hordwell, Hants. The types ; one shows ^74 and the true 

 molars. Hastings Collection. Purchased, 1855. 



1 Bull. Soo. Philom. Paris, sdr. 7, vol. i. p. 52 (1877). 

 1 Ann. Soc. Sci. Phys. Nat. Toulouse, 1884, p. 1. Ibid. p. 10. 



