ON SOME MESOZOIC FOSSILS. U 
It is as it were a panorama from which scenes and personages have 
been omitted and changed in the course of successive reproductions 
so that it has become impossible to say that any one of the latest of 
them is the lineal descendant of the original. 
A FISH. 
To other fishes from the Rolling Downs very imperfectly made 
known by the nature of their remains may be added an Acanthop- 
terygian of considerable size, collected by Mr. Berney. The mere 
existence of this addition to our Cretaceous fish fauna is all that can 
be gathered from the four abdominal vertebrae which represent it, 
and as it is in much the same predicament as the Chirocentridan fish 
dismissed nameless by Dr. Woodward (Ann. Mag. N.H. 6 xiv p. 417) 
it may share the same fate. The neurapophyses and their spines are 
in their place and the ends of ribs from preceding vertebrae rest on 
the sides of those preserved. The four centra, which present no 
significant character superficially, are together 76 mm. in length ; 
the anterior one is perforated centrally, in the posterior one the fact 
of its perforation is obscure ; their diameters are at the anterior 
42 mm., posterior 45 mm. 
