Br. Du Riche Preller — Lakes in Switzerland. 343 



the structure and rendering the clavicles functionless by increase 

 in size of the ventral rami of the scapulae. The coracoids are 

 anchylosed to each other and to the fused scapulae, while the glenoid 

 is modified so as better to receive a directly forward thrust from the 

 head of the humerus. Seeley L pointed out that perfect ossification 

 and elongation of processes is coincident with higher organization 

 and is more characteristic of Plesiosauria in the newer rocks. 



In conclusion, I have to express my indebtedness to Dr. C. W. 

 Andrews for providing me with every facility for studying the 

 Leeds Collection at South Kensington, and my best thanks are due 

 to Professor Gregory for the interest he has taken in the work 

 and for the indispensable guidance I have received from him. 



Some dimensions (in centimetres) of the type-specimen (V. 1091) 

 are given below, together with some dimensions of specimens of 

 Cryptocleidus for comparison. 



Length of centrum in mid-ventral line 

 Width of posterior end of centrum .... 

 Height of posterior end of centrum .... 

 Height to top of neural spine ..... 



Greatest length of combined scapula and coracoid 

 Width of united coracoids between outer ends of 

 postero-external angles ..... 



Greatest length of pubis . 

 Greatest width of pubis . 

 Width between antero-external angles of the two pubes 



Humerus : Length ....... 



Width of distal expansion 

 Femur : Length ....... 



Width of distal expansion . . . t . 



IV. — Alpine, Lowland, and Jura Lakes in Switzeeland. 

 By C. S. Du Eiche Preller, M.A., Ph.D., M.I.E.E., F.G.S., F.E.S.E. 



IN the preceding paper 4 I dealt with the five principal and zonal 

 sub-Alpine lake basins in relation to their age and origin, while 

 the object of the present one is to group and consider the more 

 prominent of the smaller Swiss lakes which I have had repeatedly 

 occasion to visit and examine. Omitting the high altitude lakes, such 

 as the Merjelen and the Engadine Lakes, which I described in previous 

 papers, 5 as also the hundreds of lakelets- disseminated throughout 



1 Seeley, Q.J.G.S., vol. xxx, pp. 449, 1874 ; Proc. Eoy. Soc, vol. li, p. 149, 

 1892. 



2 Andrews, B. M. Cat., Marine Reptiles of the Oxford Clay, pt. i, pp. 195-6, 

 1901. 



3 Op. cit. , pp. 190-1. 



4 Geol. Mag., 1915, pp. 215-24. 



5 Ibid., 1896, p. 97, and 1893, p. 222. 



