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Y>i' w 



62 CETACEA. 



Section II. Denticete. Teeth well cleveloped in one or both Jaws, some- 

 times dcviduous. Pcdate a-ithtmt Ixdcen. Head large or moderate; 

 tympanic bones 2, suhsimilar, united, free in a cavity in the base of 

 the shall. 



A. JVostrils longitudinal, parallel or diverging, covered with a valve, 



one often larger and more developed. Pectoral , broad, truncated; 

 fingers 5. 



3. Catodontid^. Head bliuit ; back of tlie skiiU concave. Teeth only 



in the lower jaw, fitting into pits in the upper. 



4. Platanistid^. Head longly beaked ; back of the skull covered with 



the reflected edge of the niaxillaries. Teeth in both jaws compressed. 



B. Nostrils united into a single transverse or crescent-shaped blower. Teeth 



in both Jaws, often deciduous. Pectoral fin lanceolate. 



5. Inhd^. Head beaked. Teeth rugiilose, crowns with an internal 



process. Back without any fin, keeled behind. 



6. Delphinid^. Head beaked. Teeth simple, cylindrical, conical, 



smooth, in the whole length of both jaws, sometimes deciduous. 

 Back rounded. Dorsal fin falcate, rarely wanting. Pectoral fin 

 moderate^ on the upper part of the side of the body ; fingers 4- or 

 5-jointed. 



7. GlobiocephalidvE. Head ventricose. Teeth cylindrical, simple, in 



the front of both jaws. Dorsal fin falcate. Pectoral fin low down 

 on the sides of the body ; fingers elongate, many-jointed. 



8. HTFEB^fe©?fTH>vi:. Head beaked. Teeth few, cylindrical or com- 



pressed in the front or side of the lower jaw only. Dorsal fin falcate. 

 Pectoral fin low down on the sides of the body; fingers 4- or 5- 

 jointed. 



Suborder II. Shhi rather hairy ; tchiskers rigid. Limbs claiced. Teats 2, 

 pectoral. Nostrils 2, apical. Herbivorous. Sirenia. 



9. Manatid^. Grinders none, or flat-crowned. Front of jaws covered 



with horn. 



Suborder I. CETE. 



Skin smooth, without hair. Limbs clawless ; fore limbs fin-hke ; 

 hinder caudal, horizontal, forked or rounded. Teats 2, inguinal. 

 Nostrils enlarged and close together, called blowers. Carnivorous. 

 Teeth conical, all similar, often not developed, and absorbed. Palate 

 often furnished with transverse pendent homy plates of baleen or 

 whalebone ; fringed on the edge. 



Cete, Gray, Ann. Phil. 1825; Selys-Longchamps, 1842; Gray, Cat. 



Cetac. B. M. 1850, 5. 

 Cetacea, Blumenbach ; Dumeril, Z. A. 1806 ; Lilljeborg, Of vers. 2. 

 Cetacefe camivorse, Gray, Med. Rep. xv. 309, 1821. 

 (Soufllem's) Hydi'aula, Latr. Fam. Nat. 1825, 05. 

 Natantia, Cete, Illiger, Prodr. 141, 1811. 

 Cete /3, Fi.'^cher, Syn. 1828. 

 Mammalia pinnata, Storr, Prodr. Mamm. 1780. 



