CHAPTER VIII

THE ORDERS SIRENIA AND CETACEA 212

ORDER SIRENIA 212

Family MANATIDÆ, 215; Manatus, 215. Family HALICORIDÆ, 220; Halicore, 220. Family RHYTINIDÆ, 221; Rhytina, 221. EXTINCT SIRENIANS, 222; Halitherium, 222; Other forms, 223. Bibliography, 224.

ORDER CETACEA 225

Suborder MYSTACOCETI 234

Family BALÆNIDÆ, 234; Balæna, 236; Neobalæna, 241; Rhachianectes, 241; Megaptera, 241; Balænoptera, 242; Extinct genera, 245.

Suborder ARCHÆOCETI 246

Family ZEUGLODONTIDÆ, 246; Zeuglodon, 246.

Suborder ODONTOCETI 247

Family PHYSETERIDÆ, 247; Subfamily Physeterinæ, 248; Physeter, 248; Cogia, 250; Extinct physeteroids, 251; Subfamily Ziphiinæ, 251; Hyperoödon, 252; Ziphius, 254; Mesoplodon, 254; Berardius, 256; Choneziphius, 257. Family SQUALODONTIDÆ, 257; Squalodon, 257. Family PLATANISTIDÆ, 257; Platanista, 258; Inia, 259; Pontoporia, 259; Fossil forms, 259. Family DELPHINIDÆ, 260; Monodon, 260; Delphinapterus, 262; Phocæna, 263; Cephalorhynchus, 266; Orcella, 267; Orca, 267; Pseudorca, 268; Globicephalus, 268; Grampus, 270; Feresia, 270; Lagenorhynchus, 270; Delphinus, 271; Tursiops, 271; Prodelphinus, 271; Steno, 271; Sotalia, 272. Bibliography, 272.