$26 Dr Hissert on the Limestone of Burdiehouse, 
elaborated, seem to have been more favourable to the develop- 
ment of animal life than any other medium. 
One observation, however, I have not unfrequently made, 
which is this : that in portions of the limestone remarkable both 
for the quantity of entomostraca, as well as diffused vegetable 
matter which they contain, numerous remains of fish are not un- 
frequently found. In Plate VII. fig. 6., for instance, is a frag- 
ment which includes, along with microscopic entomostraca, the 
vegetable remains of the Lepidostrobus, and the fish to which the 
name has been assigned of Paleeoniscus Robisoni. 
SECTION XVII—THE ACQUISITION OF ORGANIC REMAINS WHICH MAY BE 
EXPECTED DURING THE PROCESS OF QUARRYING. 
I have at length described the mineral character, and the 
various organic remains enclosed in the freshwater limestone of 
Burdiehouse ; its plants; its entomostraca; its smaller fish; the 
entombed relics of its larger monsters, the scaly Megalichthys, 
and the Gyracanthus formosus, the latter armed with immense 
and beautifully configurated rays. 
An investigation of the rich treasures of the quarry is only at 
its commencement. From the multitude of vegetable remains 
which every explosion of the quarry brings to light, the limestone 
appears as if it had been destined to enclose a whole grove which 
had existed of Lycopodiaceze, and other kindred plants, beset 
with a dense undergrowth of smaller ferns. Under these circum- 
stances, a rich field must surely await the fossil botanist. 
Nor is the field of research less promising to the entomologist 
who has leisure to study the countless entomostraca with which 
the deposit, in its original state, must have almost seemed alive. 
Although many genera or species may be detected, only three 
have been yet noticed, chiefly on account of the less complex 
character which they display. 
But the great treasures of the quarry consist in its verte- 
bral animals. Upon the valuable additions to fossil ichthyology, 
6 
