S. V. Wood,jun. — American and British Surface- Oeology. 13 



phalanges similar to those of the Ursidce. The prsemolars and 

 molars, on the other hand, have grinding crowns, the canines are 

 small, and there are two incisors in each jaw, which agree with 

 those of the Rodents in being of large size, in having chisel-shaped 

 crowns, and in springing from persistent pulps. 



One other discovery, also made by Marsh, I must just mention, 

 and then I have done. The eminent palaeontologist just alluded to 

 has shown that the Lower Eocene of New Mexico and the Middle 

 Eocene of the West contain a number of Lemuroid genera, higher 

 in type than the existing Lemurs, but decidedly inferior to the 

 Catarhine monkeys. The most remarkable point about the two prin- 

 cipal genera of early Lemuroids — viz. Lemuravus and Limnotherimn 

 — is their generalized, character. This is especially seen in the 

 dentition, Lemuravus having no less than forty-four teeth, arranged 

 in a continuous series, and Limnotherium having forty teeth. 



I have now endeavoured to lay before you a brief account of some 

 of the leading results which have been effected by the researches of 

 palaeontologists during the last few years. The field we have 

 traversed is a wide one, and there are many parts of it which it 

 would have amply repaid us to have considered in detail. I need 

 hardly add, also, that I have been compelled by the exigencies of 

 time to forbear altogether from even an allusion to many important 

 accessions to our knowledge. One of the objects of this address will, 

 however, have been gained if I have succeeded in convincing you 

 that the Science of Palasontology is in a sound and healthy condition, 

 not yet arrived at maturity, but growing actively, and likely to grow 

 in the future. This ought to be the more satisfactory to us, as we 

 may feel quite sure that it is to Palfeontology, perhaps more than to 

 any other Science, that we may look for the key to some most inter- 

 esting and important theoretical problems in Biology. 



IT. — American " Surface Geology," and its Eelation to British. 

 With some Eemarks on the Glacial Conditions in Britain, 

 especially in Ebference to the " Great Ice Age " of Mr. 

 James Geikie. 



By Searles V. Wood, Jun., F.G.S. 



(PART III.) 



(Illustrated by a large folding Map and Sections. Plate I.) 



{Concluded from Dec. II. Vol. IV. page 551.) 



I HAVE, in the foregoing, endeavoured to set out the general con- 

 ditions under which that one principal Glacial deposit of England 

 which I term " Upper Glacial " was accumulated, according to 

 the views to which I have been led by several years' active exami- 

 nation of the area occupied by it, and a still longer study of the 

 phenomena observed. They differ materially in many respects from 

 the views urged by Mr. Jas. Geikie in his " Great Ice Age," and 

 continued observation will help to determine which can best be 

 reconciled with the facts ; but before leaving the subject of this 

 formation, I must observe that the diagram and description by Mr. 

 Skertchly of the manner in which Lincolnshire was glaciated, as 



