74 
NATURAL HISTORY. (Fossils.) 
[north 
and having their posterior margin entire,) is represented by the 
fishes contained in the remaining Cases, 27 to 35 inclusive ; com¬ 
mencing with the Scomberoids, some of which are arranged in the 
lower part of Case 26, the remainder occupying Cases 27 and 28. 
Among the most ancient of the family of Scomberoids , Cuv., are 
the species of the genera Palceorhynchum , Palimphyes, Archceus , 
Isurus , and Anenchelum , in the slate of Glaris, of which a suite of 
characteristic specimens is here deposited; the chalk of Lewes has 
furnished instructive specimens exhibiting the dentition of Enchodus 
halocyon. Among those from Monte Bolca, the more prominent 
are the Carangopsis dorsalis , the Gasteronemus rhombus , &c. ; 
the heads, &c., of a species of Cybium , from Sheppey, from which 
latter locality are also some species of Tetrapterus, a genus of the 
family of Xiphoids. ( Case 28, lower shelves.) 
The family of Pleuronects ( Case 28, bottom shelf) is represented by 
one genus only, namely Rhombus, having one fossil species, the elegant 
R . minimus, smaller than any of the recent species, from Monte Bolca: 
the specimen here preserved was presented, together with specimens of 
the Semiophorus, by Chambers Hall, Esq. 
Of the family of Sphyrcenoids (Case 29, upper shelves), the genera 
deposited are mostly known only by portions of the jaws and teeth, 
such as those of the different species of Saurocephalus described and 
figured in M. Agassiz' great work, where also are to be found several 
delineations from specimens forming part of the series of Hypsodon 
Lewesiensis; these latter placed on the lower shelves. 
In Case 30 will be found the few remains of Siluroid fishes. They 
consist of some portions of a species referred to the genus Pimelodus , 
from the Sewalik Hills, presented by Major Cautley, and the speci¬ 
mens upon which Mr. Dixon founded his species, Silurus Egertoni, 
from the Eocene of Bracklesham. 
All species belonging to the family of the Cyprinoids or Carps 
(Cases 31, 32, and 33), are fresh-water fishes. The most interesting 
of those here deposited are the large and most perfect specimens 
of Tinea furcata and T. leptosoma, from Oeningen — the locality 
from which one of the smaller species of Leuciscus derives its name ; 
the largest species of the latter genus, L. Hartmanni, is from the 
tertiary formation of Steinheim, in Wiurtemberg; the small L. papy- 
raceus, from the lignite called paper coal, of Bonn and Bareuth, 
to which species also the impressions in semiopal, from Bohemia, 
appear to belong. 
Among the Esocids or pikes (Case 33), the fine suite of speci¬ 
mens of Esox lepidota from Oeningen deserve particular notice, as 
likewise the large Sphenolepis squamosseus, from Aix, in Provence, 
and the Sphenolepis Cuvieri, of very rare occurrence in the gypsum 
of Montmartre, and named after its illustrious discoverer, by whom it 
was first noticed in his Recherches sur les Ossemens fossiles. 
The Halecoids (Cases 34), or Herrings, begin with the chalk, and 
are frequent in more recent formations: of those from the chalk, may 
be mentioned the Clupea Scheuchzeri , megaptera, kc., from the so- 
called slate of Glaris; and, above all, the considerable suite of spe¬ 
cimens (many of them figured in Agassiz’ work) of Osmeroides, first 
described as Salmo Lewesiensis by Dr. Mantell, by whom they were 
