62 CETACEA. 



Section 11. Denticete. Teeth well developed in one or both jaws, some- 

 times deciduous. Palate nithotit baleen. Head large or moderate ; 

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

 the shall. 



A. Nostrils longitudinal, 2Mrallel or diverging, covered tvith a valve, 



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

 fingers 5. 



3. Catodontid^. Head blunt ; back of tlie skull concave. Teetb 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 maxillaries. Teeth in both jaws compressed. 



B. Nostrils united into a single transverse or ci^escent-shaped blower. Teeth 



in both jaws, often deciduous. Pectoral fin lanceolate. 



5. Iniid^. Head beaked. Teeth rugulose, crowns with an internal 



process. Back ^\*ithout 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. GLOBiocEPHALiDyE. 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. Hyperodontid^. Head beaked. Teeth few, cylindrical or com- 



pi'essed 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 H. Skiii rather hairy ; tvhiskers rigid. Limbs clawed. Teats 2, 

 pectoral. Nostrils 2, apical. Herbivorous. Sieenia. 



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 -like ; 

 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 horny 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, Blumenhach ; Tiumeril, Z. A. 1806 ; Lilljeborg, Of vers. 2. 

 CetacefB carnivorte. Gray, Med. Rep. xv. 309, lH21. 

 (Souflleurs) Hydraula, Latr. Fam. Nat. 1825, 65. 

 Natantia, Cete, lUiger, Prodr. 141, 1811. 

 Cete /S, Fischer, Syn. 1828. 

 Mammalia piunata, Storr, Prodr. Ma nun. 1780. 



