Some years since, at Madras, I (Dr. Day) obtained several specimens of a fresh-water Siluroid fish (_Macrones vittatus_) which is termed the "fiddler" in Mysore. I touched one which was on the wet ground, at which it appeared to become very irate, erecting its dorsal fin, making a noise resembling the buzzing of a bee. Having put some small carp into an aquarium containing one of these fishes, it rushed at a small example, _seized it by the middle of its back_, and shook it like a dog killing a rat; at this time its barbels were stiffened out laterally like a cat's whiskers. Many fish when captured make noises, perhaps due to terror. Thus the _Carangus hippos_, _Tetraodon_, and others grunt like a hog. Darwin (Nat. Journ., vol. vii) remarks on a catfish found in the Rio Paraná, and called the armado, which is remarkable for a harsh grating noise when caught by hook and line; this noise can be distinctly heard when the fish is beneath the water. The cuckoo-gurnard (_Trigla pini_) and the maigre (_Pseudosciæna aquila_) utter sounds when taken out of the water; and herrings, when the net has been drawn over them, have been observed to do the same: "this effect has been attributed to an escape of air from the air-bladder; but no air-bladder exists in the _Cottus_, which makes a similar noise." The lesser weaver (_Trachinus_) buries itself in the loose soil at the bottom of the water, leaving only its head exposed, and awaits its prey. If touched, it strikes upwards or sideways; and Pennant says it directs its blows with as much judgment as a fighting-cock. (Yarrell, vol. i. p. 26.) Fishermen assert that wounds from its anterior dorsal spines are more venomous than those caused by the spines on its gill-covers. As regards fighting, I should suppose that, unless some portion of the body is peculiarly adapted for this purpose, as the rostrum of the swordfish, or the spine on the side of the tail in the lancet-fishes, we must look chiefly to the armature or covering of the jaws for weapons of offense.