DAVIS : NOTE OX CHLAMTDOSELACHUS. 
113 
type of a group of sharks hitherto considered to be extinct since the 
Carboniferous period. The resemblance is no doubt striking, and 
the discovery of intermediate forms in the secondary or tertiary 
formations will be a great assistance in guiding the palaeontologist 
to a correct estimation of its value, but at the present no such 
evidence exists, and whilst the immense value of the discovery of 
the fish cannot be too fully appreciated, it may be well to await 
fresh evidence before finally deciding that Chlamydoselachus is a 
descendant from the fossil Cladodonts. J 
Explanation of Plate XL 
Fig. A. Chlamydoselachus auguineus, Garman. 
,, B. Ctenacanthus, restored. 
1. Tooth of Chlamydoselachus auguineus. 
„ 2, Ditto. showing base. 
,, 3. Ditto. lateral view. 
4. Tooth of Cladodus mirabilis, Ag. 
„ 5. Ditto. base of another specimen. 
,, 6. Ditto. lateral view of same. 
ON THE PHYSICAL GEOGRAPHY AND GEOLOGY OF THE EAST 
EIDING OF YOEKSHIRE. BY REV. E. MAULE COLE, M.A. 
The East- Riding of Yorkshire is bounded on the East by the 
North Sea_, on the South and West by the Humber and Ouse as far 
as York, thence to Stamford Bridge by the road to Garrowby Hill, 
after which the boundary follows the course of the River Derwent 
to its junction with the Hertford, the latter rivulet forming the 
boundary as far as Muston Carr, where a line is made for a ravine 
which separates Filey Church from the old fishing town of Filey. 
This area, small as it is, contains within itself for the geologist, 
ornithologist, and botanist probably greater scope for research than 
any equal area in England. Geologically it consists of all the various 
formations from the New Red Sandstone upwards, including the 
Lias, Oolite, and Chalk, whilst nowhere are the Boulder Clays of 
the Ice Age so well developed. The grand precipitous Chalk Cliffs 
of Bempton, 400ft. high, are the favorite breeding place of tens of 
