EURYLAIMINJE. 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. 



EURYLAIMINJE, THB BROAD-BILLS. 



EURYLAIMUS ......... Bill excessively dilated ....... TYPICAL. 



CYMBIRHYNCHUS..BUI more conical ................. SUB-TYPICAL. 



PLATYSTOMUS ....... Wings long, tail forked ....... FISSIROSTRAL. 



PSARISOMUS .......... Mouth or bill very small ..... TENUIROSTRAL. 



SKRILOPHUS .......... Head crested, quills pointed. RASORIAL. 



If we consider the Eurylaimince as constituting the 

 sub-typical division of the family of Muscicapidce, 

 it will of course follow that Eurylaimm, 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 Insessoret , and the Eaptores follow the Na- 

 tatores in the orders of the whole class. ~Eurylaimu9 

 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 



