350 JOURNAL OF THE PLYMOUTH INSTITUTION. 
have been met with. Not only were there no bones of the Hyzna; 
there were none of his feces, none of his teeth marks, no bones 
fractured after his well-known pattern; in short, nothing whatever 
to indicate his existence. 
The bones found in the superficial Black Mould were of much 
less specific gravity than those found in the accumulations below 
it, and were generally so light as to float in water. Those in the 
two sets of deposits represented by the Cave-earth and the Breccia 
respectively, had lost their animal matter, and adhered to the 
tongue when applied to it so as frequently to support their own 
weight; but those from the Breccia and its Crystalline Stalagmite 
—the lowest known deposits—were distinguished from the remains 
of the Cave-earth series in being much more mineralized and more 
brittle, by being of a darker or sometimes of a much whiter colour, 
and frequently by emitting a metallic sound when struck. 
The following general statements may be of service before 
proceeding further :— 
1st. The Cavern contained three distinct mechanical accumula- 
tions—the Black Mould, or uppermost, or most modern; the 
Cave-earth, including the local Black Band; and the Breccia, or 
lowermost, or most ancient known. Their mode of succession was 
never transgressed, and the materials of which they consisted were 
so very dissimilar as to characterize them with great distinctness. 
2nd. These three accumulations were separated by two distinct 
Stalagmitic Floors having strongly contrasted characters. That 
dividing the Black Mould, or uppermost deposit, from the Cave- 
earth was Granular; whilst that lying between the Cave-earth 
and the Breccia, or lowermost deposit yet found, was eminently 
Crystalline. 
3rd. Animal remains occurred everywhere, but more abundantly 
in the mechanical beds than in the Stalagmites. 
4th. The period represented by the Black Mould—the most 
modern period—may, as a matter of convenience, and so far as 
the Cavern is concerned, be termed the Ovine period ; remains of 
Sheep being restricted to this accumulation. 
5th. The period of the Granular Stalagmite, Black Band, and 
Cave-earth, taken together, may be denominated the Hyenine 
period, the remains and indications of Hyena being confined to 
these deposits, and far more prevalent than those of any other 
species. 
