538 
CANCROMA. BOATBILL. 
Generic Character. 
nostrum longum, latum, de- 
pressum, ovatum, sulca- 
tum, supra carinatum ; 
mandibula supcriore cym- 
bse rcsuplnatm forma, apice 
adunca ; inferiore recta, 
})lana, in medio membra- 
nosa, apice subito acuta. 
Narcs parvae, ovatac, in sulco 
sitae. 
Pedes tetradactyli, fissi ; di- 
giti antici basi membrana 
coaliti. 
Beale long, broad, depressed, 
ovate, sulcated, carinated 
above ; the upper man- 
dible like a reversed boat, 
its tip bent down ; the 
under straight, smooth, 
membranaceous in the mid- 
dle, the tip abruptly acute. 
Nostrils small, ovate, placed 
in a groove. 
four-toed, cleft; the an- 
terior toes with their base 
connected by a membrane. 
Cancuoma. Lmn., Gmel., Lath., Cuv., Vieil. 
CoCHLEARIUS. BlisS. 
HE beak of the Boatbill is of a curious form, as 
its name seems to imply : it is by some likened to 
a boat with its keel upwards, and by others to the 
bowls of two spoons placed with the hollow jtarts 
together: the upper mandible has a prominent 
ridge at the top, and on each side of this a long 
channel, at the bottom of which the nostrils are 
placed ; these are oval, and situated obliquely. 
Only one species is known. 
