[ 401 ] 
but where the organ becomes narrower, it may be ob- 
ferved in fome places, that two join or unite into one ; 
efpecially where a nerve pafTes acrofs. The termina- 
tion of this organ at the tail is fo very fmall that I could 
not determine, whether it confiited of one feptuin or 
more. The diftances between thefe fepta will differ 
in fiflies of different fizes. In a fifli of two feet four 
inches m length, I found them ~ of an inch diflant 
from one another; and the breadth of the v/hole or- 
gan, at the broadefl part, about an inch and a quarter, 
m which fpace were thirty-four The fmall or- 
gan has the fame kind of fepta^ in length paffing from 
end to end of the organ, and in breadth pafiing quite 
acrofs; they run fome what ferpentine, not exadly in 
ftraight lines (' 0 . Their outer edges terminate on the 
outer furface of the organ, which is in contaa with the 
mner furface of the external mufcle of the hii, and their 
inner edges are in contadf with the centre-mufcles. 
1 hey differ very much in breadth from one another; 
the broadefl being equal to one fide of the triangle, and 
the narrowefl fcarcely broader than the point or edge. 
They are pretty nearly at equal diflan ces from one ano- 
ther; but much nearer than thofe of the large organ, 
being only about -*-th part of an inch afunder : but they 
are at a greater diflance from one another towards the 
tail, in proportion to the increafe of breadth of the or- 
gan. Theorgan is about half an inch in breadth, and has 
fourteen Thefe in both organs, are very 
{t) PI. II. LLL. 
H h h 2 
tcndcj' 
