186 



TERTEBRATA. 



Diagramma. 

 Pristipoma. 

 Therapon. 

 Helotes. 



Aphredoderid(S. 

 Aphredoderus. 



Percida. 

 Dules. 

 Pomotis. 

 Bryttus. 

 Centrarchus. 

 Huro. 

 Arrhipis. 



Grystes. 

 Apogon. 

 Ambassis. 

 Pentaceros. 

 Mesoprion. 

 Genyoroge. 

 Ehypticus (Soap- 

 fish). 



Plectropoma. 

 Serranus. 

 Anthias. 

 Centropristis. 

 Enoplosus. 

 Niphon. 

 Etelis. 



Aspro. 



Lucioperca. 



Acerina. 



Lates. 



Labrax (Basse). 



Perca (Perch). 



Berycidce. 

 Beryx. 

 Myripristis. 

 Holocentrum. 



G-asterosteidcB. 

 Gasterosteus (Stickle- 

 back). 



Order IV. LOPHOBEANCHII. 



Skeleton only partially osseous. Gills placed in tufts on the 

 branchial arches. Body covered with plates united at their 

 edges. 



The jaws are united and tubular ; and the mouth is without 

 teeth. There are no ribs, and the air-bladder is without an air- 

 duct. The tail is prehensile in Hippocampus. The fins are im- 

 perfectly developed. 



The Syngnathi "are supposed to be able, by dilating their throat 

 at pleasure, to draw their food up their cylindrical beak-like 

 mouths, as water is drawn up the pipe of a syringe." 



In some of the Syngnathidse the males have a subcaudal pouch, 

 formed by two flaps of the skin, into which the female casts her 

 roe, and in which the young are hatched ; in others there are he- 

 mispherical depressions in which the eggs are placed. In Hip- 

 pocampus there is also a pouch, but opening by a vertical fissure. 

 It has been observed that when " any unusual care is taken of 

 the eggs or young of fishes, the duty devolves upon the male." 

 Pegasus has laminate gills, as in the ordinary fishes ; its place is 

 probably near Triglidre. 



