143 
various degrees of consistence, from the fluid naphtha 
and mineral oil or petroleum , to the solid asphalt and 
jet or pitch coal; the elaterite or elastic bitumen of 
Derbyshire, (a suite of specimens exhibiting all de¬ 
grees of solidity, from that of honey to that of a com¬ 
pact ligneous substance; with which is also placed the 
dapeche , an inflammable fossil substance found by 
Humboldt in South America, having several properties 
of the common caoutchucor Indian rubber;)—the hat - 
chettine, a bituminous substance from Merthyr Tydvil 
in South Wales.—-Coal: black coal , and brown coal—oi 
these a few specimens only are placed in glass Case 62, 
their different varieties being rather objects for a geo¬ 
logical collection. 
The arrangement of the secondary fossils in this 
Gallery is proceeded with as expeditiously as circum¬ 
stances will admit. Several upright glazed cases are 
fitted up for the Class Reptilia, comprising osseous 
remains of the Batrachian, the Chelonian, the Emydo- 
saurian, and the Enaliosaurian Orders. The objects 
already deposited belong chiefly to the two last men¬ 
tioned natural orders, the first of which is divided into 
the families of the Crocodiles and the Iguanas. Among 
the specimens under arrangement the following may be 
specified:—a species of gavial (now considered a dis¬ 
tinct genus bearing the name of AHolodon) from the lias 
at Monheim in Franconia, being the unique specimen 
described and figured by Soemmerring in the Memoirs 
of the Academy of Munich, under the name of Croco- 
dilus prisons ;—a portion of the head, with the snout, &c. 
of a gavial (Teleosaurus Chapmanni) from Whitby, 
which, though correctly determined by its discoverer, 
Capt. W. Chapman and also by Wooller (Phil. Trans, 
for 1758), was subsequently mistaken for a species of 
Ichthyosaurus;—a head of Crocodilus Toliapicus , 
probably the same which is mentioned by Cuvier as 
Crocodile de Sheppy ;—the head and other parts of 
the Geosaurus (the Lacerta gigantea of Soem¬ 
merring) found together with the preceding, and first 
figured 
LONG 
GALLERY. 
Nat. Hist. 
