EURYLAIMINAS. 
247 
Erolla. The circle is thus closed ; the series follow 
each other in the usual order ; and we have the fol- 
lowing beautiful illustration of the primary types of 
the ornithological circle. 
EURYL AIMING, the Broad-bills. 
Genera. 
Eurylaimus Bill excessively dilated Typical. 
Cymbirhynchus..B'i 11 more conical Sub-typical. 
Platystomus Wings long, tail forked Fissirostral. 
Psarisomus Mouth or bill very small Tenuirostral. 
Serilophus Head crested, quills pointed.RASORLAL. 
If we consider the Eurylaimince as constituting the 
sub-typical division of the family of Muscicapidce, 
it will of course follow that Eurylaimus , as exhi- 
biting the most depressed and the strongest hooked 
bill, is the type of its own circle. This is further 
proved by Platystomus, which is the fissirostral type, 
evincing such an immediate connexion to Cymbir- 
hynchus, which must consequently be the sub- 
typical form, these two types always following each 
other. "We find, in confirmation of this law, that 
the Dentirostres follow the Fissirostres in the tribes 
of the Insessores ; and the Raptores follow the Na- 
tatores in the orders of the whole class. Eurylaimus 
being therefore the type, represents the insessores, 
and Cymbirhynchus is the sub-typical ; the other 
genera speak for themselves. For although we 
know little of Psarisoma, and therefore cannot esta- 
blish its direct analogies to the Tenuirostres, it 
