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MALACOPTERYGIOUS FISHES. 
I. Furnished with ventral Jins. 
a, Ventrals abdominal, or situate between the pectorals and the vent. 
b. Upper jaw formed by the intermaxillary and maxillary bones. 
c. Two dorsals, the last fleshy and destitute of rays. Salmo- 
kida:. 
Salmo. 
Osmerus. 
Coregonus. 
ec. One dorsal fin. Intermaxillaries narrow and short ; maxil- 
laries protrusile. Belly compressed. Clupead^. 
Clupea. 
Encrasicholus. 
bb. Upper jaw formed by the intermaxillaries. 
c. Mouth wide, with strong teeth. Esocid.®. 
d. Dorsal and ventral fins entire. 
Esox. 
Belone. 
dd. The last rays of the dorsal and ventral fins detached, form- 
ing spurious fins. 
Scomberesox. 
cc. Mouth small ; teeth minute. Cyprinid^e. 
d. Lips simple. 
e. Dorsal fin with a spinous ray. 
Cyprinus. 
Barbus. 
ee. Dorsal fin destitute of spinous rays.' 
/. Mouth with a beard. The dorsal and anal fins 
short. 
Gobio. 
Tinea. 
ff. Mouth beardless. 
Abramis. 
Leuciscus. 
dd. Lips fleshy, fit to act as a sucker. 
Gobitis. 
aa. Ventrals, thoracic or jugular; i. e. situate directly under, or nearer 
the head than the pectorals. 
b. Sides of the body similar. An eye on each side- 
c. Breast furnished with a sucker. 
d. Sucker double. 
Lepadogaster. 
dd. Sucker single. 
Liparis. 
Cyclopterus. 
VOL. I. 
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