2IO TlMEHRI. 
minute cells, filled with a gelatinous matter and 
comparable to the cells of a battery, while a very 
large number of nerves are distributed to these organs : 
the saw-fish (Pristis antiquorurn, no. 66^ a young 
specimen of this shark-like fish, which, however, from 
the position of the gill apertures on the under part of 
the body, and not on the side as in the true sharks, is 
classed as a family of the rays ; this fish is one of the 
swiftest and most vigorous of its kind, and is distinguished 
from all others by the curious elongated beak, studded 
with sharp spines implanted like teeth ; large saws from 
this fish are shewn suspended from the other side of the 
Museum, and a large specimen of the fish itself, 
about twelve feet in length, is suspended opposite 
the door : the querriman (no. 51) a large mullet 
highly esteemed as food : the black-striped cat-fish 
(Platystoma ttgrinum ) no. 54^ one of the curious Silu- 
roid fishes, a group distinguished by being destitute of 
scales though sometimes furnished with scattered scutes, 
and having a mailed head with charafteristic barbels or long 
bristle-like or ribbon-like streamers about the mouth ; this 
cat-fish is a very beautifully marked form, and its flesh is 
well-flavoured: a stinging-ray (no. 7) one of the great order 
(Selachia) of the Sharks, but distinguished from the true 
sharks by the flattened body and the situation of the gill 
apertures on the under side of the body : the needle- 
fish or ribbon-fish (no. 17) a silvery and extremely 
elongated form : the four-eyes (Anableps tetrophihalmus, 
no. \o) ) a curious carp, common in trenches and rivers, 
having very prominent eyes which by a fold of membrane 
are divided externally into four areas as though there 
were four distinft eyes — a charafter on which its common 
