MR. W. K. PARKER ON THE OSTEOLOGY OF BALANICEPS REX. 285 
Group 3.—The great fronto-maxillary hinge is here composed of splint-like laminz of 
the nasal processes of the pre-maxillaries and nasals, which overlap the sphenoido-fron- 
tals ; or the lacrymals and sphenoido-frontals are adapted to the contiguous bones of 
the facial sclerotome by a dentate suture, the margin of the hinge being more or less 
synovial. The rostrum of the basi-sphenoid in this group is either patched on each 
side or completely covered with synovial cartilage for a definite extent, on which 
lubricated space the pterygo-palatals glide. Vomer variable. 
Examples :— 
Aquiline (Eagles). Ciconia alba (White Stork). 
Accipitrine (Hawks, Falcons, Harriers, Kites, Baleniceps rex (Shoe-bill). 
Buzzards). Cancroma cochlearia (Boat-bill). 
Vulturine (Vultures). Ardea cinerea (Heron). 
Serpentarius (Secretary-bird). Botaurus stellaris (Bittern). 
Podargus humeralis (Giant Goatsucker). Phenicopterus ruber (Flamingo). 
Alcedo ispida (Common Kingfisher). ; Rallus (Rail). 
Dacelo giganteus (Giant Kingfisher). Gallinula chloropus (Water-hen). 
Cuculus canorus (Common Cuckoo). Fulica atra (Coot). 
Pheenicophaus (a Cuculine genus). Tribonyx mortieri (Native Hen). 
Picus viridis (Green Woodpecker). Brachypteryx australis (Short-winged Rail). 
Trochilus colubris (Humming-bird). Podiceps (Grebe). 
Sylviine (Soft-billed Songsters). Colymbus (Diver). 
Passerine (Hard-billed Songsters). Uria (Guillemot). 
Corvine (Crow-tribe). Alca (Auk). 
Lophyrus cristatus (Crowned Pigeon). Eudyptes demersa (Penguin). 
Didus ineptus (Dodo). Sula bassana (Gannet). 
Didunculus strigirostris (Owl-billed Pigeon). Phalacrocorax carbo (Cormorant). 
Hematopus ostralegus (Oyster-catcher ). Pelecanus onocrotalus (Pelican). 
Gdicnemus crepitans (Stone Curlew). Sterna (Tern). 
Platalea leucorodia (Spoonbill). Larus (Gull). 
Otis tarda (Great Bustard). Procellaria (Petrel). 
Grus americana (American Crane). Diomedea exulans (Albatros). 
Grus pavonina (Crowned Crane). 
Group 4.—Fronto-maxillary hinge more or less splint-like and elastic, palatines 
loosely connected with basi-sphenoid. Near the anterior end of the pterygoid there is, 
on its inner surface, an oval, flat-faced, elevated process, which looks upwards and in- 
wards, and which is articulated to an exactly similar process on the basi-sphenoidal 
rostrum ; this latter process being the well-known ento-pterapophysis of the post- 
sphenoidal centrum—the homologue of the internal pterygoid plate of the Mammalia 
and Man. Vomer variable. 
Examples :—The typical Gallinaceous genera, e. g., Pavo cristatus, Meleagris gallo- 
pavo, Talegalla, Gallus, Perdix, &c. 
The Lamellirostres, ¢. g., Anas, Querquedula, Rhynchaspis, Mergus, Anser, Cygnus ; 
certain Fissirostres, e. g., Caprimulgus europeus, Cypselus apus, and the one of the Pro- 
VOL. IV.—PART VII. 23s 
