484 T. F. Jamieson — Changes of Level in Glacial Period. 



the same time, if it were to be regarded as generically distinct from 

 Tomistoma, both it and the present species might perhaps be placed 

 in the same genus, Gavialosuchiis. 



The dimensions of the type-specimen are : — 



cm. 



Length of occipital condyle to tip of snout 64-0 



Width between outer angles of quadrates 27'0 



Greatest width of skull roof 18-0 



Width of middle of rostrum 6*4: 



Tomistoma kerunense, n.sp. 



An imperfectly known species from the Birket-el-Qurun Beds 

 (Middle Eocene), which are separated from the Upper Eocene 

 deposits containing T. gavialoides by the thick Qasr-es-Sagha series, 

 in which Tomistoma africanum occurs. 



The best specimen is a part of a skull, in which most of the region 

 behind the middle of the orbits as well as the premaxillary portion 

 of the rostrum are wanting. It differs from T. gavialoides in having 

 a rostrum which narrows more gradually and the upper surface of 

 which is more regularly convex from side to side; the orbits also 

 are less rounded and the inter-orbital bar broader than in that species. 

 The teeth were larger and are separated by longer intervals. To 

 this species the name Tomistoma kerunense may be given. 



The reptilian remains from these Egyptian beds are of far less 

 interest than the mammals, since they differ little from their modern 

 representatives. In Tomistoma gavialoides, however, we may have 

 an intermediate form, showing how the highly specialized fish-eating 

 Gavial may have arisen from a Tomistomn-like reptile, a supposition 

 that is strengthened by the fact that no remains of a true Gavial are 

 known from earlier beds. Dr. E. Fraas has lately announced ^ that 

 he has remains of a species of Tomistoma from the lower beds of 

 the Middle Eocene of the Mokattam Hills at Cairo. When these 

 specimens are described perhaps some further light may be thrown 

 on the interrelations of the various lonof-snouted Crocodilia. 



II. — Some Changes of Level in the Glacial Period. 

 By T. F. Jamiesox, F.G.S. 



IN Scandinavia there have been various changes of level during the 

 Glacial period, and some geologists of that country are of opinion 

 that the load of ice which lay upon it affords a probable means of 

 accounting for a depression and submergence of the land such as 

 would lead to the formation of those elevated beds of Arctic shells 

 which are met with in the interior of tliat region. But there has 

 been a later movement of quite a different nature, whereby the 

 Baltic seems to have been converted for a time into a fresh-water 

 lake, and it is to this that I now want to draw attention, as I think 

 the same cause which has been supposed to produce the depression 



' "Neue Zeuglodonten aus dem untereu Mitteleocan vom Mokattam feei Cairo" : 

 Geol. u. Palaeont. Abhand., neue Folge, Bd. vi, Heft 3 ; Jena, 1904. 



