PHYSETEKID^. — CXCIII. 335 



ovate, placed low, with five fingers enclosed in thick skin ; snout 

 more or less produced, the forehead rising abruptly in the adult. 

 Genera 4 ; species about 10, mostly of the Southern seas. 



a. Teeth in S evident. 



b. Visible teeth two, in tip of lower jaw Ziphius, 580. 



bb. Visible teeth two, in side of lower jaw Mesoplodon, 581. 



aa. Teeth in both jaws wanting or concealed ; beak long. 



Htperoodon, 582. 



580. ZIPHIUS Cuvier. (An old name, from ^i(f)os, sword ?) 



1107. Z. cavirostria Cuvier. L. 20 feet. Atl. (^m.). (Lat., 

 concave-snout.) 



581. MESOPLODON Gervais. (fxtaos, middle ; SnXov, 

 armature ; odwv, tooth.) 



1108. M. bidens (Sowerby). Cow-fish. N. Atl., scarce. 

 L. 20 feet. (Eu.) (Lat., with two teeth.) 



582. HYPEROODON Lacdp^de. (vrrfpaa, palate ; d8u)v, tooth.) 



1109. H. rostratus (Miiller). Bottlk-nosed Whale. 

 Sperm-Whale Porpoise. Beak distinct in young, obscured in 

 adult by the development of bony crests which give the head the 

 shape of a trunk or chest. N. Atl. L. 25 feet. (,Eu.) (Lat., 

 long-nosed.) (Z'. semijunctus Cope.) 



Family CXCIH. PHYSETERID^. (The Sperm 

 Whalp:s.) 



Teeth numerous, in lower jaw only ; lower jaw very thin and 

 flat ; upper jaw heavy ; eye placed high, much above angle of 

 mouth. Two genera, with 3 or 4 species, in warm seas. 



o. Dorsal fin present, behind middle of back ; teeth 18 to 30, very sharp ; 

 head bluntish but not truncate ; spiracles on top of head ; length about 



20 feet KoGiA, 583. 



aa. Dorsal fin wanting; teeth 40 to 50, large and blunt; head very long and 

 deep, truncate in front, the cavity of the snout filled with oil and sper- 

 maceti ; spiracles in front of head ; length 60 to 80 feet. 



Physeter, 584. 

 583. KOGIA Gray. 



1110. K. brevicepa (Blainville). Pigmy Sperm Whale. 

 L. 10 feet. AVarm seas, occasional on our coast. (Lat., short- 

 headed.) (Eu.^ 



584. PHYSETER Linnaeus, {(^va-rjtfjp, a whale, from (pvada, 

 to blow.) 



1111. P. macrocephaluB L. Spkrm Whale. Cachalot. 

 Blackish, paler below. Open sea, commonest far S. ; one of the 



