536 
THE OCEAN WORLD. 
upper jaw being longer than their under one. They attain the thick- 
ness of a man’s leg, and are sometimes two yards in length. The 
conger-eel is frequently found in salt marshes, but its flesh is held in 
little esteem. 
2. SUB-BRANCHIATI. 
The fishes of this order are characterised by vertical fins being 
attached under the pectorals, and immediately suspended to the 
shoulder bone. Exclusively marine fishes, they inhabit every region 
of the globe. The order comprehends three families: — I. Discobo- 
lidse ; II. Pleuronedidte, or flat fishes ; III. the Gadidse. 
I. niSOOBOLIDAi. 
The family of Discobolidas consists of a small number of species 
characterised by their ventral fins being disooform, as in the sea-snails 
Fig. 366. The Sea-Snail (Liparis). 
(Liparis), in which the lengthened mucous body is without scales, but 
with one long dorsal fin ; the pectoral and ventrals forming one disk, 
as in Fig. 366, or the Suckers ( Lepidogaster ), where the pectorals and 
ventrals form two disks. 
In the Lump-fish, Cyelopteris (Fig. 367), the disk formed by the 
ventrals forms a sort of sucker, by which the fish attaches itself to the 
rocks ; while the Echinm is remarkable for the disk-like sucker with 
which it is provided. 
The Pcliineis remora is an inhabitant of the Mediterranean. It is 
furnished with a flat disk, which covers its head, as represented in 
