Chapter XXX: The True Sharks

Order Notidani.--Family Hexanchidæ.--Family
Chlamydoselachidæ.--Order Asterospondyli.--Suborder
Cestraciontes.--Family Heterodontidæ.--Edestus and its
Allies.--Onchus.--Family Cochliodontidæ.--Suborder Galei.--Family
Scyliorhinidæ.--The Lamnoid, or Mackerel-sharks.--Family
Mitsukurinidæ, the Goblin-sharks.--Family Alopiidæ,
or Thresher-sharks.--Family Pseudotriakidæ.--Family
Lamnidæ.--Man-eating Sharks.--Family Cetorhinidæ, or Basking
Sharks.--Family Rhineodontidæ.--The Carcharioid Sharks, or
Requins.--Family Sphyrnidæ, or Hammer-head Sharks.--The
Order of Tectospondyli.--Suborder Cyclospondyli.--Family
Squalidæ.--Family Dalatiidæ.--Family Echinorhinidæ.--Suborder
Rhinæ.--Family Pristiophoridæ, or Saw-sharks.--Suborder
Batoidei, or Rays.--Pristididæ, or Sawfishes.--Rhinobatidæ,
or Guitar-fishes.--Rajidæ, or Skates.--Narcobatidæ,
or Torpedoes.--Petalodontidæ.--Dasyatidæ, or
Sting-rays.--Myliobatidæ.--Family Psammodontidæ.--Family Mobulidæ. 523

CHAPTER XXXI.

THE HOLOCEPHALI, OR CHIMÆRAS.

The Chimæras.--Relationship of Chimæras.--Family
Chimæridæ.--Rhinochimæridæ.--Extinct
Chimæroids.--Ichthyodorulites. 561

CHAPTER XXXII.

THE CLASS OSTRACOPHORI.

Ostracophores.--Nature of Ostracophores.--Orders of
Ostracophores.--Order Heterostraci.--Order Osteostraci.--Order
Antiarcha.--Order Anaspida. 568

CHAPTER XXXIII.

ARTHRODIRES.

The Arthrodires.--Occurrence of
Arthrodires.--Arthrognathi.--Anarthrodira.--Stegothalami.--
Arthrodira.--Temnothoraci.--Arthrothoraci.--Relations of
Arthrodires.--Suborder Cycliæ.--Palæospondylus.--Gill on
Palæospondylus.--Views as to the Relationships of Palæospondylus:
Huxley, Traquair, 1890. Traquair, 1893. Traquair, 1897. Smith
Woodward, 1892. Dawson, 1893. Gill, 1896. Dean, 1896. Dean, 1898.
Parker & Haswell, 1897. Gegenbaur, 1898.--Relationships of
Palæospondylus 581

CHAPTER XXXIV.

THE CROSSOPTERYGII.

Class Teleostomi.--Subclass Crossopterygii.--Order of
Amphibians.--The Fins of Crossopterygians.--Orders of
Crossopterygians.--Haplistia.--Rhipidistia.--Megalichthyidæ.--Order
Actinistia.--Order Cladistia.--The Polypteridæ 598