Incluye bibliografía: páginas 457-468 e índice: páginas 469-481

Preface.. The Beginnings of the Fish Skull.. Differentiation of the Neurocranium and the Branchiocranium.. Serial Homology of the Jaws with the Gill Arches.. The Hyomandibular Problem.. Origin of the Orobranchial Apparatus of Gnathostomes.. Origin of the Opercular Series.. Summary: Four Chief Stages in the Origin of the Jaws, Branchial Arches and Opercular Elements.. Synopsis of Ten Stages Leading to the Typical Percomorph Skull.. Classification and Nomenclature of Skull Parts.. Elements of the Preorbital Region.. Remarks on Dr. Leighton Kesteven's Nomenclature.. Are the Premaxillæ Compound Elements?.. The Evolution of Particular Skull Types.. Lower Chordates.. Sharks, Rays, Chimæroids.. Dipnoi.. Crossopterygu.. Polypterini.. Palaeoniscoidei.. Chondrostei (Spoonbills, Sturgeons).. Protospondyli (Semionotids, Pycnodonts, Garpikes, Macrosemiids).. Amioidei.. IsosPONDYLi (Primitive Teleosts).. Clupeoidea (Albulids, Tarpon, Herrings, etc.).. Salmonoidea (Salmon, Smelt, etc.).. Stomiatoidea.. Osteoglossoidea.. Mormyroidea.. Gonorhynchoidea.. Ostariophysi.. Characins, Gymnotids, Carps and Catfishes.. Heterognathi (Characins).. Glanencheli (Gymnotids).. Eventognathi (Carps, Suckers, etc.).. Nematognathi (Catfishes).. Heteromi.. Halosaurs (Notocanths).. Apodes.. Eels, Morays.. Mesichthyes (Intermediate Teleosts).. Iniomi (Scopeloids).. Lyomeri (Gulpers).. Haplomi (Pikes, etc.).. Microcyprini (Top-minnows, etc.).. Synentognathi (Needle-fish, Flying-fish, etc.).. Thoracostei (Sticlilebacks, Tube-mouths, Sea-horses, etc.).. AcANTHOPTERYGii (Spiny-finncd Teleosts).. Salmopercse.. Berycoidei.. Percoidei (Bass, Perch, Snappers, Sparids, Cichlids, Wrasses, etc.).. Percesoces (Barracudas, Silversides, Gray Mullets).. Labyrinthici (Snakeheads, Climbing Perches, etc.).. Zeoidei (John Dory, Boar-fish, etc.).. Chætodontoidei (Butterfly-fishes, Angel-fishes, etc.).. Balistoidei (Acanthurids, Zanclids, Siganids, Teuthids, Plectognaths).. Allotriognathi (Opah, Oar-fish, etc.).. Scombroidei (Crevalles, Mackerel, Tunnies, etc.).. Discocephali (Sucking-disc Fishes).. Scorpaenoidei (Rock-fishes, Cottids, Gurnards, etc.).. Heterosomata (Flatfishes, Soles).. Gobioidei (Gobies).. Symbranchii.. Opisthomi (Mastacembelids).. Ammodytoidei (Sand-lances).. Trachinoidei (Notothenes, Weavers, Star-gazers, Dragonets, etc.).. Xenopterygii (Cling-fishes).. Blennioidei (Blennies, Brotulids, etc.).. Anacanthini (Cods, etc.).. Haplodoci (Toad-fishes).. Pediculati (Anglers, Sea-mice, Sea-bats).. Tentative Phylogeny of the Principal Skull Types.. The Fish Skull as a Natural Mechanism.. Form and Evolution of the Branchiocranium.. Adaptive Radiation of the Mouth and Its Parts.. Dimensional Factors in the Mouth Region.. The Suspensorium.. The Dentition.. Protrusility.. The Branchial Arches.. Muscles of the Branchial Arches and Jaws.. The Opercular Elements.. Embryology of Jaws, Hyoid Arch and Opercular Series.. Form and Evolution of the Neurocranium.. Mutual Adjustment of Head and Body.. Stream-lining.. Differential Growth Rates—Extrinsic and Intrinsic.. Functions of the Four Main Parts of the Neurocranium.. Adjustments of the Neurocranium to Various Types of Jaws, Different Positions of Mouth, etc. .. Responses to Cranial Diverticula of the Swim-bladder.. Moulding Influence of the Eyes.. Influence of the Auditory Capsules.. Adjustments in the Ethmoid Region.. Effects of Special Accessory Organs (Trigger, Illicium, etc.).. Adjustments to Different Types of Skin.. Spinescence.. Development of a Cranial Buckler.. Adjustments for Balance and Flotation.. Why the Fish Skull is Divided into Separate Bones.. Discussion: The Fish Skull As a Document of Evolution.. Development and Evolution.. The Mechanism of Regulation.. The Paradoxes of Adaptation.. "Basic Patents" and Evolution.. Fish Skulls and Natural Selection.. Summary: The Problem of Differential Growth and Evolution in Fish Skulls.. The Rôle of Development.. The Three Main Skull Types: Long, High, Broad.. Correlation of Skull-form and Body-form.. The Interaction of Growing Parts.. Evolution through Differential Growth Rates.. The Mechanism of Correlation.. Bibliography.. Index

With the proliferation of books that appear annually, it is rare for one to reach the standing of a classic. William K. Gregory's Fish Skulls, originally published in the transactions of the American Philosophical Society in 1933, has had lasting significance and usefulness, rendering it a classic in published ichthyology literature. Islandés