640 THE LIVING ANIMALS OF THE WORLD 



i-^ 



rh,l, t) H'. Sai'illi^Ktnl, F. Z.S.I 



SEA-HORSES 



iMilford-on-Sia 



The species on the right is remarkable for the dei'elopment of /on^ 

 leaf-like processes all o-ver the bod\^ causing the fish to hear a t'ery close 

 resemblance to the seaiveed antontrst zuhich it dtvells 



As a rule file-fishes are of small size, but 

 some attain a length of 2 feet, and many are 

 beautifully and symmetrically marked. 



The Coffer-fishes derive their name 

 from the box-like cuirass in which they are in- 

 vested. This is formed by numerous closely fit- 

 ting, hexagonal bony plates, forming a mosaic, 

 and lea\ing only the fins and hind part of the 

 tail free. This bony case \-aries greath' in 

 form, in some species being three-ridged, in 

 others four- or e\'cn five-ridged ; while in some 

 long horns are developed, making the defensive 

 armature still more complex. More than 

 twenty species are known, all confined to 

 tropical and sub-tropical seas. 



The Gi.OBE-FiSliES and Sun-FISHes con- 

 stitute the last family of this reall}' extra- 

 ordinar)' assemblage. The covering of the 

 body consists either of minute scales or large 

 spines, which can frequently be raised or depressed at will. All the members inhabit tropical 

 or sub-tropical seas, and a few occur in the fresh-waters of the same regions. 



The GlodE-FISHES have short, thick bodies, covered either with small spines, as in the 

 To.\D-Flsn, or very large ones, as in the PORCUPINE-FISII, or Sea-hedgehog. They are remark- 

 able for their habit of filling the gullet with air, and then distending the body to an enormous 

 size. This device enables the fish to escape its enemies; for when so inflated it rises to the 

 surface and floats belly-upwards, and, the inflated portion projecting above the water, the fish 

 is blown along by the wind to more secure regions. The more heax'ily armed species 

 become still more formidable when inflated, as the spines are then full)' erected. Escaping 

 from enemies below by flight, thc}' are thus secure from enemies abo\'e by reason of their 

 armature. Globe-fishes have been found floating ali\e and unhurt within the stomachs of 

 sharks which had swallowed them, and one has even been k-nown to eat its way out through 

 its captor's side, and so killing its would-be devourcr ! When a globe-fish desires to return 

 to its normal elongated shape, it expels the air from the gullet through the mouth and 

 gills, the expulsion causing a curious hissing 

 sound. 



Extrei.iel)' unlike the foregoing members 

 of the group of comb-gilled fishes, the Sl'N- 

 FISII is nevertheless cptite as remarkable in 

 form, looking as if it had undergone the am- 

 putation of its hind parts. The singular shape 

 of the other members of the comb- and tuft- 

 gillcd fishes are undoubted!)' adaptations to 

 a\'oid enemies, cither b\' rendering the animal 

 inconspicuous, or hurtful by reason of its 

 powerful armature. The form of the sun- 

 fish appears to be an adaptation for the 

 capture of food, as this fish pre)'s largcl)' 

 upon the fry of other fishes which inhabit 

 enormous depths, and consccpiently can only 

 be obtained by diving. Sun-fishes inhabit 

 the surface-waters, but as divers have few 

 equals. 



Fhotahy If. S.ivnh-Kinl, f.Z.S.] 



SEA-HORSES 



iMilford.im..^ia 



Attaching themselves to marine plants by livisling their tails around 

 them 



