89 
GALLERY.] NATURAL HISTORY. (Fossils.) 
of Cololites (petrified intestines) has been given ;_the specimens of 
the scarce Eugnathus speciosus and of Ptgc/iolepis Bollensis, from the 
has of Dorsetshire and Wlirtemberg, &c. 
Among the Ccelacanths (Cases 11 to 13 ) may be pointed out, as 
more particularly interesting, one or two of the species from the De- 
vonian system of Scotland and Russia; the instructive specimen of 
Holopty chius nobilissimus discovered in the old red sandstone of Clash- 
binnie, near Perth, by the Rev. James Noble , the specimens of Glyp- 
tolepis leptopterus from Lethenbar ; specimens of a few of the smaller 
species of Asterolepis, and (on the top of the case) casts of bones of 
the head of Asterolepis Asmusii, and of a related species, found in 
the old red sandstone of Riga. Provisionally placed with the Ccelacanths 
is the genus Macropoma ; the complete and beautiful suite of speci- 
mens of its principal species, M. Mantelli , from the chalk of Sussex, 
formed part of the Mantellian collection. 
The Pycnodons (Cases 15, 16, lower shelves). Several of the 
specimens here deposited are illustrative of the character by which the 
teeth of the fishes of this family may easily be distinguished from those 
of some placoid fishes. Among the largest of the teeth are those of some 
species of Pycnodon, from the upper oolite, especially P. Giyas, and of 
Spharodus Giyas , formerly described as petrified eyes of toads, &c. ; also 
the teeth of Placodus Giyas , from the Muschelkalk of Franconia, 
deserve particular notice. 
The family of Scleroderms ( Cases 15 and 16, middle shelves): among 
the species belonging to it, in the collection, are: a suite of specimens 
of Dercetis elonyatus, chiefly from the chalk of Preston, near Brighton ; 
the Acanthopleurus serratus , likewise from the chalk formation" (slate 
of Glaris) ; and the Blochius lonyirostris, from Monte Bolca. 
Ihe third Order of fishes, the Ctenoijjs, or Ctenolepldoti 
(so called from their scales being formed of layers, of which the upper- 
most are denticulated or comb-toothed at their posterior margin ) is 
divided into the following families — the Percoids, Sparoids, Scienoids, 
Cottoids, Gobioids, Aulostomes, Chetodons, Pleuronects, and Muefil- 
loids. The type of the first of them (Cases 17 and 18) is the perch ; 
and of the three fossil species known, the Perea lepidota from 
Oeningen, of which a remarkably perfect specimen is here deposited, is 
the largest. Among specimens of other genera belonging to the Per- 
coids may be mentioned the fine series from the Sussex chalk, of 
Beiyx Lewesiensis , which (as also that of Dercetis, in this Case) formed 
part of Dr. Mantell’s rich collection ; and three scarce species of 
Phacolepis, placed with them, are from the chalk formation of Brazil. 
Of the few fossil Sparoids, or Breams, (Case 19,) the Sparnodus 
ovalis, from Monte Bolca, and the Scicenurus Bowerbankii , from 
Sheppey, may be mentioned : all the fishes of this family are from 
more recent formations than the chalk, as is also the case with the 
species of the Cottoids or Bullheads, (Case 19, middle,) the Goboids 
or Gobies, and the Teuthies of Cuvier, most of the fossil representa- 
tives of which families are from Monte Bolca. 
1 he principal genus of the family of Aulostomes, ( Case 20, lower 
shelves,) is Fistularia, one species of which occurs at Monte Bolca; 
the other, Fistularia maynifica (Egert. Catal. ), in the Engi slate of 
Canton Glaris. 
