340 Horner's Geological Address. 



loss of a sufficient supply of vegetable food for the greater 

 herbivorous quadrupeds, and, by their diminished numbers, 

 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 de- 

 termined; shewing 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 plio- 

 cene period as they are at the present day.'' 



In this work, eighty species of British fossil Mammalia 

 are described, of which the following (forty-two in number) 

 were either originally determined by the author as new spe- 

 cies, or were first recognised by him as occurring in a fossil 

 state. They were, for the most part, described in the publi- 

 cations of this Society. 



Amphitherium Broderipii. Lophiodon minimus. 



Arncola agrestis. Lutra vulgaris. 



pratensis. Macacus eocenus. 



Balaena afRnis. pliocenus. 



definita. Machairodus latidens. 



.— . emarginata. Meles taxus. 



gibbosa. Palaeotherium magnum. 



Balaenodon physaloides, crassum. 



Bison minor. minus. 



Bos longifrons. Palaeospalax magnus. 

 Cervus Bucklandi. Phascolotherium BucHandi. 

 Tarandus. Phocaena crassidens. 



Chaeropotamus Cuvieri. Physeter macrocephalus. 



Coryphodon eocenus. Rhinolophus ferrum equinum. 



Dichobune cervinum. Sorex vulgaris. 



Equus plicidens. Strongyloceros spelaeus. 



Felis pardoides. Talpa vulgaris. 



Hyracotherium leporinum. Trogontherium Cuvieri. 



cuniculus. Ursus priscus. 



Lagomys spelaeus. Vespertilio vulgaris. 



Lophiodon magnus. 



Of the eighty species described in this work, — 



