iu;cKi{OTKs. 197 



(knus DICHOCEROS. 



Glogcr, Hand- u. Ililfsb. p. J};^.') (1842). 



Dichoceros bicornis. 



Buceros hiconiis, Linnajus, Syst. Nat. i. p. 153 (1760). 

 Dichoceros hiconiis, Elliot, Mouogr. Eucerot. pi. (1877). 



The HoRNBiLL. 



JIdh. Indo-Chinese countries. 



843. Cranium, with casque removed, to show reticuhited struc- 



ture of osseous platforms attaching it to u{)per mandible. 

 0. C. 1501. PresenUd hj Sir William BUzard, FM.S. 



844. Skull, longitudinally hisected. 0. C. 1502. ITunterian. 



845. Skull, with cas(]ue. 0. C. 1499. Hiuitenan. 



846. Skull, with casque. 0. C. 1499 a. 



Presented hij E. JJickiua/i, Esq. 



847. Skull, with upper [»art of casque removed, wanting sheath 



of mandibles. 0. C. 1502 A. 



Genus HYDROCORAX. 



Brisson, Orn. iv. p. 506 (1761)). 



Hydrocorax hydrocorax. 



Buceros Jii/drocoraM, Linnaeus, Syst. jSTat. i. p. 153 (1706). 

 Hydrocorax planicornis, Elliot, Monogr. Bucerot. pi. 7 (1877). 



The Elat-casqued Hornbill. 



Ilah. Philipjiine Islands. 



848. Mandibles and casque. 0. C. 150G. Ilunterian. 



Genus RHINOPLA.X. 



Glogcr, Hand- u. Hilfsb. p. 335 (1842). 



Rhinoplax vigil. 



Buceros vvjil, J. 11. Forstcr, Zoolog. liidica, p. 40 (1781). 

 lihinoplax vvjil, Elliot, Mouogr. Eucerot. pi. 10 (1876). 



The Helmeted Hornbill. 



ll<d>. Malayan reiiinsula and Archipelago. 



