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CANCROMA. 
Cancroma, Linné, Gmel., Lath., &c. 
Cocuiearius, Brisson. 
GauiinuLa, Ray. 
CHARACTER GENERICUS. 
Rostrum gibbosum, latissimum : mandibula superior resupi- 
naté cymbeformis ; supra carinata; carina utrinque ca- 
naliculata, canali narifero, apice adunca: mandibula in- 
Jferior plana; apice abrupte acuminata. 
Pedes elongati, tetradactyli; digitis tribus anticis basi pal- 
Matis ; uno postico. 
BOATBILL. 
GENERIC CHARACTER. 
Beak gibbous, very broad: upper mandible boat-shaped ; 
above keeled; the keel on each side channelled, the 
channels bearing the nostrils: under mandible flat; the 
apex abruptly acuminated. 
Legs with four toes; three toes before with their bases 
webbed ; one behind. 
There are several species of this genus, or several varie- 
ties of one species, all of which inhabit South America. 
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