256 Dr. Schreibers’s Description of 
such a surprising organization. I have dissected many larvae of 
water lizards, but never could discover any such structure. 
The skin of this animal is very tenacious and coriaceous : by 
looking at it with a magnifier, there appears a quantity of 
minute glands under the epidermis, similar to those in water 
lizards, &c. It is strongly attached to the muscles under- 
neath, in several places, by the cellular membrane, in which 
the above mentioned glands are dispersed, and which is filled, 
particularly upon the back, with a tough viscous matter. Of 
the muscular fibres, I observed three different layers, which 
however are very thin, but firmly connected with each other : 
the fibres of the two outer layers are very tender, and trans- 
verse; those of the middle layer are stronger, and longitudinal. 
On the under side of the lower jaw, are the following strata. 
Immediately under the skin is a thin stratum of transverse 
fibres ; under this, in the middle, is a stratum of longitudi- 
nal fibres ; there are also two very large and strong muscles on 
each side, of which the upper ones consist of fibres running 
obliquely from the middle outwards and downwards : the under 
ones are somewhat stronger, and consist also of oblique fibres, 
not running parallel to the first, but still more obliquely, and 
almost transverse. The forehead and the occiput are covered 
by five muscles ; two in the middle of the forehead, very large, 
and composed of strong transverse curved fibres, divided only 
by a ridge from each other, and forming together the figure of 
a heart, with the point backwards : their fore part forms the 
declivity of the front to the rostrum, (which is only covered by 
a thin layer of longitudinal fibres,) and the two tubercules on 
the forehead, which Dr. Scopoli took for eyes. On each side 
of these muscles there is another muscle, composed of very 
