458 MK. F. E. BEDDARD ON AVIAN BRAINS, [^P^'- 1^, 



associated with A. magnum at Cadibona, Gelocus and Propalmo- 

 chcerus, ai'e somewhat older types. Moreover, the Upper Oligocene 

 deposits of St. Gerand-le-Puy (AUier) contain no Anthracotheres, 

 whereas in the nearly contempoi-aneous lignites of Pyriniont a 

 more modern type of Anthracotheres than A. tnagnum is repre- 

 sented, viz., Brachyodus ■porcinus (Gerv.) *. These views are 

 confii-med by the latest researches in the geology of the Limagnef, 

 where the deposits containing Anthracotherium magmion are 

 referred to the Middle Oligocene (Stampian), even to its lowest 

 portion, so that we shall have to consider as Middle Oligocene 

 also the Lignites of Cadibona and Majorca. 



Although remains of Anthracotheriuon are not rare in onr 

 collections, the various forms are not very well kno\\ai, and many 

 fossils have been called A. magnum which have little to do with 

 the type species of Cadibona. In this respect also the remains 

 obtained by Mr. 0. Thomas increase our knowledge, and this 

 discovery is certainly the most important restilt of his and 

 Mr. R. I. Pocock's trip to the Balearics. 



EXPLANATION OP PLATE XXIX. 



AntliracotJierium magnum Cuv. 

 All figures natural size. 



Fig. 1. Peimltiniate right iipper premolar, from below. Pig. 1 a, external ; fig. 1 h, 



anterior view, .r = inner cusp. 

 Fig. 2. Incomplete second right upper true molar, external view. Fig. 2 a, lower 



view. pi. = anterior intermediate cusp, broken away in specimen fig. 3. 

 Fig. 3. Second left upper true molar, posterior view. Pig. 3«, lower view. 



Mr, F. E. Beddard, F.R.S., exhibited and made remarks upon 

 -a series of Avian brains, of which the arterial system had been 

 injected. 



The following papers Vv-ere read :- 



* Ch. Deperet et H. Douxami, " Les Vert(5bres oligocenes de Pyrimont-ChalloDges 

 (Savoie)," IMem. Soc. Paleont. Suisse, xxix. p. 41 (1902). 



t J. Giraud, " Etudes geologiques sur la Limagne (Auvergne)," Bull. Serv. Carte 

 Geol. de la France, vol. xiii. no. 87 (1901-1902). 



