514 PISCES [CH. 



Family 1. Clupeidae. Clupeiformes in which the oviduct is 

 continuous with the ovary, air-bladder penetrates the skull and 

 there are no adipose fins. 



Ex. Clupea, Engraulis. 



Family 2. Salmonidae. Clupeiformes with short oviducts with 

 wide funnels, air-bladder normal. An adipose fin behind the dorsal. 

 Ex. Salmo, Salvelinus, Coregonus, etc. 



Sub-order 2. Anguilliformes. Teleostei devoid of pelvic fins, 

 and in which the pectoral girdle is disconnected from the skull. 

 Air-bladder with open duct. No mesocoracoid and no hard spines in 

 the fins. The premaxilla is lost, the maxilla if present bears teeth. 



Ex. Anguilla. 



Sub-order 3. Ostariophysi. Teleostei with abdominal pelvic 

 fins and an open duct to the air-bladder. With a " Weberian chain " 

 of ossicles connecting air-bladder and skull. A mesocoracoid is 

 present. 



Family 1. Cyprinidae. Ostariophysi in which the skin has 

 normal thin cycloid scales. There is an interorbital septum and 

 the symplectic is present. The maxilla does not bear a barbel. 



Ex. Cyprinus. 



family 2. Siluridae. Ostariophysi in which the skin is naked 

 or covered with ganoid scales beset with placoid denticles. The 

 cranial cavity extends between the eyes, the symplectic bone is 

 absent. The maxilla is toothless and carries a long barbel. 



Ex. Amiurus. 



Sub- order 4. Haplomi. Teleostei with abdominal pelvic fins 

 and an open air duct to the bladder. No mesocoracoid and no 

 Weberian chain. 



Family. Esocidae. Supra-occipital separates the parietals. 

 Ovaries and oviducts continuous with one another. 

 Ex. Esox. 



Sub-order 5. Percesoces. Teleostei in which the pelvic fins 

 are close behind the pectoral fins but not attached to the cleithra. 

 The duct of the air-bladder is closed. 



Family. Mugilidae. Percesoces in which the pelvic bones are 

 attached to the postcleithra. 

 Ex. Mugil. 



