The sound produced by the elastic-spring-apparatus of a recently caught _Doras maculatus_, has been described as a "deep growling tone," which may be distinctly heard at a distance of 100 feet when the Fish is out of the water. Under like conditions the air-bladder and its muscles, in a species of _Platystoma_, emit a similar sound. On the other hand, the sound produced by the elastic springs of the Electric Siluroid (_Malopterurus electricus_) has been compared to the hissing of a cat. The Sea-Horse (_Hippocampus brevirostris_) utters a monotonous sound analogous to that of a tambour, which is characteristic of both sexes, but is more intense and frequent in the breeding season. The "Coffer Fish" (_Ostracion trigonus_) emits a growling sound, as also does the "Globe Fish" (_Tetrodon honckenii_) when taken out of the water.[427] The air-bladder and its muscles in the "Drum" (_Pogonias chromis_), constitute the most powerful sound-producing organ yet found in any Fish. The sounds emitted by the "Drum" are better expressed by the word drumming than by any other, and have frequently been heard by persons in vessels lying at anchor on the coasts of the United States, where these Fishes abound.[428] The "Drum" begins its drumming noise in the spawning season in April, but is rarely heard afterwards. The "Maigre" (_Sciaena aquila_), whose musical performances are perhaps responsible for the Homeric fable of the song of the Sirens, is remarkable among Fishes for the variety of its sounds, which have been compared to bellowing, purring, buzzing, and whistling.[429] The sound is often so intense that it may be heard when the Fish is at a depth of 18 metres, and the {363}ear of the observer two metres above the water; and it has been recorded that by listening for these sounds, shoals of Maigres have been successfully netted. They rarely emit sounds when isolated; but in shoals, during the breeding season, they do not cease to make sounds with a vigour and a persistency which apparently must soon wear out their strength. One of the Indian Horse-Mackerels (_Caranx hippos_) grunts like a young Pig when captured, and the sound is repeated whenever it is moved, as long as vitality remains. A West Indian species of the same family (_Argyriosus vomer_) has been observed to produce a like sound, while an Egyptian _Caranx_ (_C. rhonchus_) is known to the Arabs as the "Chakoura" or "Snorter."[430] The sounds produced by the different British Gurnards, such as the Grey Gurnard (_Trigla gurnardus_), the Piper (_T. lyra_), the Elleck or Cuckoo Gurnard (_T. cuculus_), and the Tub-Fish (_T. hirundo_), have been compared to snoring, a sonorous and prolonged grunting, crooning (whence, perhaps, the term "crooner," by which the Grey Gurnard is known in Ireland), and croaking. The John Dory (_Zeus faber_)[431] also utters sounds analogous to those of the Gurnards. Among the Dipnoi _Lepidosiren_ is said to make a growling sound, and