10 MACACUS. 



present, it was not of so strictly tropical a character as to 

 favour the full development of the Quadrumanous type. 



The formation at Sansan near Auch, in which M. Lartet 

 discovered the quadrumanous fossils allied to the Gibbon, 

 is regarded by Mr. Lyell as probably of the Miocene, or 

 middle tertiary period. In the same formation were found 

 remains of Mastodon, Dinotherium, and many other extinct 

 quadrupeds. 



With respect to the deposit at Kyson, in which the 

 remains of the Macacus eoctenus were discovered, it consists 

 of layers of white and yellow sand, which had been pierced 

 to the depth of twelve feet without reaching the bottom. 

 Above the sand is a bed of brown clay, which has been 

 laid open to the depth of twelve feet. Both the clay 

 and sand are dug for making bricks. Mr. Lyell says, "as 

 the clay at Kyson is covered by red crag at a short 

 distance from the pits, and as I had seen clay of the same 

 colour beneath the crag in the neighbouring cliffs of Bawd- 

 sey, and also at Felixstow and Harwich, containing Septaria, 

 and, as at Harwich, the imbedded shells, fruits, and bones 

 of Turtle, are such as characterise the London Clay, I enter- 

 tained no doubt that the Kyson formation belonged to the 

 Eocene period. 11 My subsequent discovery of the Hyraco- 

 therium, an extinct genus of Pachyderms, whose fossil re- 

 mains have hitherto been met with only in the London 

 Clay, and of the vertebrae of the great extinct British Boa- 

 constrictor (Pal&ophis)* equally characteristic of that 

 formation, in the same bed at Kyson from which the fossil 

 Macacque was obtained, places its geological antiquity be- 

 yond question. 



* Annals of Natural History, vol. iv. p. 189. 



