LOPIIOBRANCIIII. 327 



intestine is of imiform width, and without coeca; and their air-bladder, tliough slender, is 

 large in proportion to their size. They form two genera; and the first admits of subdivision. 



Si/ngiial/iw'!. — These are cliaractcrized by a tubular snout, composed, as in the Fistularida!, of pro- 

 loiiLjations of tlie ethmoid, vomer, temporals, pre-operculum, and other bones ; and this snout ends in a 

 mouth as i)i other fishes, only its opening is nearly vertical. The gill-opening is near the nape ; and 

 there are no ventral fins. In their reproduction there is this peculiarity, that the eggs slide into a 

 pouch formed by an inflation of the skin, and remain there tdl they are hatched. This poueh is under 

 the belly in some, anil at the base of the tail in others. It bursts spontaneously, and aUows the fry to 

 escape. [Thus these fislies have some analogy to the marsupial Marniiialia.] 



Stingnathus, the Pipe-tislies, properly so called, have a very long and slender body, differing little in diameter 

 throughout its entire length. Some have a dorsal, caudal, and anal ; others want the anal only, and in these the 

 hatching-poucli is situated under the tail. .V. acus, the Great Pipe-flsh, and S. tylphe, the Peak-nosed Pipe-fish, 

 both found in the Britisli Seas, belong to these sections. Others, again, have neither anal nor pectorals ; and 

 others no fin but the dorsal. S. opiikjion, the Snake Pipe-fish, and .5. himhrid/onms, the W'oi-m Pipe-flsh, are 

 British fishes belonging to these sections. [They have the pouch under the beUy ; and it is to be observed that in 

 all the species it is the ?nale, and not the female, which has the pouch, and hatches the eggs.] 



Hippocampus, has the body compressed laterally, and much more elevated than the tail ; and in dead speci- 

 mens the neck bends, and the upper part has a faint resemblance to the head and neck of a Horse in miniature, 

 from which they have been called Sea-horses. The margins of their scales are formed into ridges, and the angles 

 into spines. They have no fin in the tail, but that organ is prehensile, and enables them to climb or hold on by 

 the stalks of marine plants. The common species is found in the British seas, and is sometimes about five inches 

 long ; and, on the coast of Australia, there is a longer one, with the angles of the scales extended into leafy 

 appendages, 



Sofeywstomus, differ from the former chiefly in having, behind the pectorals, large ventrals united with each 

 other and with the h{)dy, and forming an apron which serves to retain tlie eggs while hatching, in the sanre 

 manner as the pouch of the Pipe-fishes. There is one dorsal of few rays near the nape, a very smalt one near the 

 tail, and a large pointed caudal, but otherwise they resemble Hippocampus. The only known species is from the 

 Indian Ocean. 



Pegasus, have a snout as in the former, but the mouth under it, and moveable, like that of a Sturgeon, only 

 composed of the same bones as in other osseous fishes. The body is armed as in Hippocampus, but their thorax 

 is broad, depressed, and with the gill-openings in the sides. They have two distinct ventrals in rear of the pecto- 

 rals, wdiich are often large, and have procured these fishes the name of Pegasus, or Flying Horses. The dorsal 

 and anal fins are opposite each other, the abdominal cavity is wider and shorter than in Syngnathus, and the in- 

 testine has two or three fle.Kures. Some species are found in the Indian seas. 



THE SIXTH ORDER OF BOXY FISHES. 



PLECTOGNATHI (Fishes with Soldered Jaws). 



Though retaining many of the characters of the Bony Fishes, the mcmljers of this order re- 

 semble the Cartilaginous ones, in tlie imperfect struetiire of the jaws, and the slow ossification 

 of the skeleton ; but still this skeleton is fibrous, and resembles that of the Bony Fishes. The 

 chief characters arc — the maxillary soldered to the side of the intermaxillary, which consti- 

 tutes the jaw, and the connexion of the palatal arch with the cranium by an immoveable 

 suture. Besides, the gill-lid and rays are concealed under the thick skin, with only a small 

 opening, the ribs are mere rivets, and there are no true ventrals. The intestine is large, and 

 without coeca; and the air-bladder is alwajs ample. They admit of division, by the character 

 of their teeth, into two very natural families. 



THE FIRST FAMILY OF THE PLECTOGNATIII. 

 Gymnodontes (Fishes with naked Teeth). 

 Instead of teeth, these have the jaws covered with a substance hke ivory, laminated internaUy, and 

 resembbng the beak of a Parrot, though these are true teeth united, and are reproduced as soon as they 

 are destroved Ijy using. Their gill-lids are small, with five obscure rays. They live on Crustacea and 

 sea-weed, and their flesh is mucous, and not hk»d, — that of some species being reckoned poisonous, at 

 least at certain seasons of the year. 



