252 
ORGANIC REMAINS 
rioiis species, and of the important inferences to 
be drawn from their presence. That gentleman 
has discovered several species, which will be figured 
and described in the memoir already referred to. 
The preceding as well as the following observations 
are, in substance, those of Mr. Sowerby, in his 
Mineral Conchology : — 
These minute shelly coverings are one tenth of 
an inch in length, and about half an inch wide : the 
surface is minutely punctated, the substance rather 
coriaceous, but brittle and very thin. They occur 
in the Sussex marble ; in the Weald clay : and their 
casts in the ironstone : at Hollington in sandstone ; 
in the Isle of Wight in clay, at Grange Chine ; 
or in slaty clay in Sandover Bay. In France they 
liave been found in the second freshwater form- 
ation above the chalk ; at Puy-en-Velay along with 
gypsum, under lava and over clay, with Planorbes 
and Cyclostomae. 
. FISHES. 
The remains of fishes in the Wealden consist of 
detached bones, teeth, scales, and fins, with but 
two or three exceptions, where a portion of the 
scales and skeleton remain in juxtaposition; these 
belong to the fish which I shall first describe. 
Lepisosteus Fittoni Scales of a dark-brown 
colour, of a rhomboidal form, possessing a high 
polisli on the external surface, with bifurcating 
processes of attachment, are among the most 
abundant fossils of the Wealden : there is not a 
