ACANTIIOPTERYGII. 303 



A third tribe has the muzzle snort, anrl the mouth cleft obliquely. It contains three genera. 

 Sepola, have a Inn? dorsal and anal, the top of the cranium flattened, the gape inclining upwards, all the spines 

 (if the dorsal flexible, but those of the ventrals stiff, cavity and stomach very short, and the air-bladder extending 

 as far as the tail. One species, of a reddish colour, inhabits the Mediterranean ; [and is occasionally found on the 

 south coast of Kngland, where it is known as the Red-band Fish, or Red Snake-fish. They appear to have little 

 command of themselves in a stormy sea]. Lophotes, head short, with an osseous crest surmounted by a spine, 

 bordered behind this with a low tin, extending from this spine to the tail, which has a very small caudal ; the anal 

 very short, pectorals moderate, and scarcely any ventrals ; teeth pointed, eyes very large, and abdominal cavity 

 occupying nearly the whole length of the body. One species is known in the Mediterranean, where it attains a 

 large size. 



THE NINTH FAMILY OF THE ACANTIIOPTERYGII. 



Theutyes (the Lancet-fish Family). 



These agree with the Mackerel family in some respects, but differ in others, such as trenchant spines 

 on the sides of the tail, and an horizontal spine before the dorsal. The family contains few genera, all 

 foreigners, with compressed oblong body, small mouth, slightly or not at all protractile, and only a 

 single row of trenchant teeth in the jaws. They feed chiefly on fuci and other marine plants, and have 

 large intestines. [Their powerful spines, which they use very dexterously, are weapons of defence 

 supplied to them for nearly the same purposes as the horns of the ruminant Mammalia.] 



Siganus, have a unique character in their ventrals, which have two spinous rays, one external and the other 

 internal, and three branch rays between them. They have five gill-rays, a horizontal spine before the dorsal, and 

 the styloid bones of the shoulder so curved as to unite at their extremities with the first interspiral bone of the 

 anal. There are numerous species in the Indian Ocean. 



Acanthurxu, Lancet-fishes, have the teeth trenchant and notched, and a strong spine at each side of the tail, as 

 sharp as a lancet, with which they inflict severe wounds on such as attempt to handle them unwarily; hence their 

 common name. They are found in the warm parts of both oceans: some with the dorsal very elevated, others 

 with a tuft of bristles before the lateral spine, and others again with the teeth divided like a comb. 



Prionuru*, differ from the last only in having a number of horizontal cutting blades on the side of the tail, in 

 place of the strong spine. [These might be termed Scarifiers.] 



Nateut, have trenchant blades in the tail like the last, but with conical teeth, and a prominent horn projecting 

 over the muzzle ; only four rays in the gills, and three in the ventrals. Their skin is leathery. 



Axinwus, more elongated than the last, and without the prominence in front, hut with the same number of rays 

 in the gills and ventrals ; on each side of the tail, they have a single square cutting-blade, without a basal shield ; 

 their mouths are small, and their teeth slender. 



Priodon, have the notched teeth of Acanthurus, the three soft ventral rays of Naseus, and the sides of the tail 

 armed like Syganus. 



THE TENTH FAMILY OF THE ACANTIIOPTERYGII. 



Fishes with Labyrinths in the Pharynx. 



By the term Pharyiif/inte labyrinthiformce, is meant that the upper membranes of the pharynx 

 ate divided into small irregular leaves, more or less numerous in the different genera, containing cells 

 between them, which the fish can at pleasure fill with water; and by ejecting a portion id' this water, 

 moisten its gills, and thus continue its circulation while out of its proper element. [From this con- 

 trivance of Nature herself, we arc to understand that, if the gills of a fish can he kepi properly 

 moistened, by salt water or by fresh, according as the fish is naturally an inhabitant of one or the 

 other, it may be carried alive over land to an indefinite distance]. By means of this apparatus, 

 these fishes are enabled to quit the pool or rivulet which constitutes their usual element, and move to 

 a considerable distance over land. This singular faculty was unknown to the ancients; and the people 

 in India still believe that these fishes fall from heaven. 



In cold and temperate climates, this apparatus is not necessary, because all the ponds and Streams 

 there, which arc capable of Supporting fi8h, are perennial, and never dried up, except ill seas, us of 



extreme drought, when, id" course, all the fishes perish ; but in tropical countries, and in India perhaps 

 above all other tropical countries, where the seasons arc alternate drought ami rain, there is neither 



food nor water for a lisli during the one season, and plenty of both during the other. Hence, tl 



fishes are furnished with this peculiar apparatus in the pharynx, by means of which the] .■■•■■ enabled 

 to follow the water over dry obstacles, and, in some id" the species, to climb steep banks, or even i; 

 i:i the course of their instinctive journeys]. The following arc the genera: — 



