a doubtful amphibious Animal of Germany . 263 
0 , The left ovary. 
p, p, The air bag. 
q, q, The left pneumatic duct, attached to the stomach by 
a membrane, and terminating in the air-bladder. 
r, r. The left air-bladder. 
s, s, The blood vessel accompanying this duct, and termi- 
nating upon the air-bladder in a large ramified branch. 
t , t , The right pneumatic duct, terminating in its air-bladder 
u, The right air-bladder. 
v , v, A membrane connecting the duct with the liver. 
Fig. 4. The viscus supposed to be the kidney . 
a, a , Its beginning in two membranous strings, in the thorax, 
upon the spine. 
b, b, Its course while yet merely membranous. 
c, c. The same, increasing gradually in size and substance, 
and being very much convoluted. 
d, d, A membrane accompanying it, and attaching it to the 
spine. 
e , e, e, Branches of blood vessels running from it, across the 
membrane, to the spine. 
/,/, Termination of this viscus, under the rectum, in a flat, 
oblong, spongy body, divided superficially, by a longitudinal 
ridge, into two equal parts. 
Fig. 5. The head and upper jaw, with the skin removed. 
a. The bill-like prolongation of the forehead, covered by a 
thin stratum of longitudinal muscular fibres. 
b , The thick upper lip. 
