Baron F. Nopcsa — British Dinosaurs. 109 



setting iu of the severe climatic conditions which caused the formation 

 of the head. 



A review of the various measurements quoted ahove and a con- 

 sideration of the maximum heights of the platform in the different 

 islands (see Fig. 4) would seem to indicate some deformation of the 

 shoreline. Owing, however, to the possibility of cumulative errors of 

 observation, to the probability that the inner angle did not always 

 bear the same relation to high-water mark, and to the subsequent 

 extensive modification by glaciation, I do not at present wish to lay 

 much stress on this point. 



Having up to the present avoided all considerations of a speculative 

 nature, I may perhaps be permitted in conclusion to suggest a working 

 hj-pothesis. It is well known that the late-glacial 100-foot beach is 

 confined to certain parts of Scotland, being absent in England, 

 Ireland, and the extreme north of Scotland (Caithness) (see Fig. 1). 

 Throughout its area of distribution it maintains, moreover, a fairly 

 uniform level of 100 feet above the sea, and where it disappears it 

 does so abruptly, not dipping gradually below sea-level like the 

 25-foot beach. Now the (0 to 12-foot) preglacial beach of Southern 

 Britain has not been traced within the area of the 100-foot beach. 

 Well within this area we find, however, the (100 to 135-foot) pre- 

 glacial beach of the Western Isles. -Now, making the admittedly 

 dangerous correlation between the two preglacial beaches, the 

 approximate coincidence of figures suggests that the movement 

 (possibly block-faulting) which brought the 100-foot late glacial 

 beach into its present position was also responsible for the elevation of 

 the preglacial beach in the Western Isles of Scotland. 



II. — Notes on British Dinosaurs. 1 Part IV: Stegosaurus prisous, 



SP. NOV. 



By Baron FRANCIS NOPCSA. 



(WITH NINE ILLUSTRATIONS IN THE TEXT.) 



SINCE the Omosaurus of the Kimeridge Clay may still be regarded 'as 

 the only well-known European representative of the Stegosauridas, 

 it seemed advisable, after discussing in previous papers the Ornithopodous 

 Ili/psilophodon and the Acanthopholidid Polacantlms, to examine a repre- 

 sentative of this type. I am therefore greatly indebted to Dr. A. S. 

 Woodward for permitting me to do so at the Natural History Museum, 

 and also for putting at my disposal a magnificent hitherto undescribed 

 Stegosaurian discovered by Mr. Alfred Leeds, E.G.S., in the Oxford 

 Clay of Fletton, near Peterborough. 



On account of the small elevation of the neural arch of the dorsal 

 vertebras I propose to name this new Stegosaurian species Stegosaurus 

 priscus. 



The type-specimen of St. prisons in the Natural History Museum 

 bears the register number B. 3167, and is represented by numerous 



1 Parti, Hypsiloplwdon, with a page illustration, appeared in the Gec-L. Mag., 

 1905, pp. 203-8 ; Part II, Polacanthus, op. cit., pp. 241-50, with Plate XII 

 and 8 text-figures; Part III, Streptospondylus, op. cit., pp. 289-93, Plate XV 

 (all in Decade V, Vol. II, 1905). 



