218 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



the want of support for the larger carnivora which preyed upon them. 

 He enumerates other causes which must have operated for a long 

 period before the agency of man aided the work of extinction. He 

 adduces many most curious and interesting particulars in illustration 

 of the laws by which the geographical distribution of the mammalia 

 of the pliocene and post-pliocene periods generally appear to have 

 been determined ; showing that, " with extinct as with existing mam- 

 malia, particular forms were assigned to particular provinces, and, 

 what is still more interesting and suggestive, that the same forms 

 were restricted to the same provinces at the pliocene period as they 

 are at the present day." 



In this M-^ork eighty species of British fossil Mammalia are de- 

 scribed, of which the following (forty-two in number) were either 

 originally determined by the author as new species, or weie first re- 

 cognised by him as occurring in a fossil state. They were for the 

 most part described in the publications of this Society. 



Amphitherium Broderipii. Lophiodon minimus, 



Arvicola agrestis. Lutra vulgaris. 



pratensis. Macacus eocenus. 



Bal aen a qffinis. pliocenus. 



dejlnita. Machairodus latidens. 



emarginata, Meles taxus. 



gibbosa. Palaeotherium magnum. 



Balgenodon physaloides. crassum. 



Bison minor. minus. 



Bos longifrons. Palaeospalax magnus. 



Cervus Bucklandi. Phascolotherium Bucklandi. 



Tarandus. Phocaena crassidens. 



Chaeropotamus Cuvieri. Physeter macrocephalus. 



Coryphodon eocenus. ^hmoXo'^Xwxs ferrum-equinum. 



Dichobune cervinum. Sorex vulgaris, 



^quius plicidens. Strongyloceros spelaus. 



FeWs pardoides. Talpa vulgaris. 



Hyracotherium leporinum. Trogontherium Cuvieri. 



cuniculus. Ursus priscus. 



Lagomys spelceus. Vespertilio vulgaris. 

 Lophiodon magnus. 



Of the eighty species described in this work, 



Three are of Oolite antiquity ; 



Twenty from Eocene tertiary strata ; 



Five from the Miocene Red Crag; 



Fifty-two from the older and newer Pliocene freshwater and drift 

 formations. 



Of the newer Pliocene species of fossil Mammalia, seventeen be-- 

 came extinct before the historic period, viz. — 

 Macacus pliocenus. Hyaena spelaea. 



Palaeospalax magnus. Felis spelaea. 



Ursus priscus. Machairodus latidens. 



'. spelaeus. Trogontherium Cuvieri. 



