Woodward— On the Bridlington Crag. . 51 
resting indeed upon the Chalk. ‘The Bridlington fossils col- 
lected by Mr. Bean are, many of them, imbedded in an olive- 
grey sand, full of small brown and black pebbles of chert and 
flint, mixed with fragments of shells. Some of the pebbles are 
coated with fossil Nullipore, Spirorbes, and Bryozoa, or with 
basal plates of Balanus porcatus and crenatus. He also obtained 
some Sharks’ teeth, bones of the Platax, like those found in the 
Norwich Crag, and an otolite resembling those of the Haddock. 
In the letter before referred to, Mr. Bean enumerates twenty- 
two genera of shells, a few of which have not since been 
verified. These are Corbula, Psammobia, Cytherea, and Turbo.* 
He also mentions ‘ Pecten, two species, whereas both the 
fragments in his collectiont belonged to P. Jslundicus. The 
‘ Tornatella’ of Mr. Bean has proved, on strict examination, 
to be a distorted Natica; and the reputed Arca tetragona has 
been converted, by washing and clearing, into a smaller valve 
of Rhynchonella. The Mactra solida of the same collection 
appears to be a recent shell. 
In Mr. Searles W 00d’s‘ Monograph of the Crag Mollusca,’ pub- 
lished by the Paleontographical Society in the years 1847-55, 
the Bridlington deposit is called ‘ Mammaliferous Crag,’ and re- 
garded as the equivalent of the Norwich beds. Forty species of 
shells are enumerated, and three varieties, which have been ge- 
nerally considered worthy of specific distinction. Two of these, 
Natica monilifera and Mya arenaria, I have not been able to con- 
firm, and there appears to be no authority for the statement that 
they were ever found at Bridlington. A third shell, Natica 
Bowerbankii (Forbes) is only mentioned as beimg indetermin- 
able; and the Astarte figured by Mr. Wood and described as 
a variety of A. mutabilis is regarded by Mr. Leckenby (with 
more probability) as a malformed example of Astarte borealis. 
Of the thirty-nine good species and varieties known to Mr. 
Wood, one is supposed to be a new species, and is described as 
‘ Natica occlusa.’ The specimens of Buccinum cannot be re- 
ferred with certainty to the ordinary recent form, and the large 
Fusus is not identified with F. gracilis by Mr. Jeffreys. The 
Cardita analis (?) of Mr. Wood is perhaps a variety of the 
recent arctic shell (C. borealis); and his Dentalium entale is 
the form now distinguished as D. abyssorum by northern 
naturalists. 
In a list of the Shells of the Norwich Crag contributed to 
* Mr. Bean speaks of the Turbo as ‘a fine pearly shell;’ by which Mr. 
Leckenby thinks Margarita elegantissima was intended. 
{ The principal portion of Mr. Bean’s collection is now in the British Museum ; 
the rest is in the Philosophical Institution at York. 
E 2 
