44 6 Dr. 3 Roy ssonet’s Account of 
mufcles being removed, we find the peritoneum, which lines the 
abdominal cavity, and is adherent to the fwimming bladder by. 
fome elongations. It is of a filver hue, with fome very fmall 
black points. The ventricle is not to be diftinguifhed from the 
inteftines by any other mark but by its iize : its form is ob- ' 
long ; it is extended almoft to the anus, from whence the 
inteftinal dudl has a retrograde courfe, and then defcends 
again, having a little dilatation near the anus. On the vertebras 
next the anus on the outiide of the peritoneum is a kind of 
cavity of an oblong form, containing a reddilh vifcus, which I 
take to be the kidney. 
The firft vertebra from the head has nothing very remarkable 
in its ftructure. The fecond has on each fide an elongated and v 
fharp apophyfis, to the apex of which is annexed a fmall liga- 
ment. The third is very flat, and has on each fide a kind of 
triangular and fharp apophyfis, to which adheres a ligament as 
to the fecond. The fourth is remarkable in having a fharp 
apophyfis on each fide, articulated with the body of the 
vertebra, and linder each of them, is another articulated apo- 
phyfis, flattifh, thick, roundifh at its extremities, and forked 
at its balls (fig. 5 .). The fifth, which is ftrpngly adherent 
to the former, has in its middle a bifid procefs. The fixth, 
has in its middle a flattifh elevation, fharp on each fide. 
!'.■ r.. ]' : - •; ; : • •; , j v: . r 
Between the extremity of the larger apophyfis of the fourth 
vertebra, is a bone, or rather a hard cartilage,, which . bears the 
figure of a kidney (fig. 6 .) its convexity being turned towards 
the body of the vertebra v its pofition, is parallel to the bodies of 
the vertebrae;, its motion is half circular one of its parts, 
the loweft, being in the cavity of the fwimming bladder, 
*> which it adheres by a thin membrane, fo that no air can 
efcape at that part. It is covered by membranes, which adhere 
(ftiongly to its middle, in this part are faftened the two liga- 
ments 
