76 



SPECIMENS OF CETACEA. 



parently more than one species, Indian Ocean, Pacific, 

 Australasian Seas. 



No specimen in Museum. 



[Tympanic, drawing of Kogia, from bone in Museum of 

 Zoology, University, Cambridge. Tympanic, length 

 l-^f^ inch, breadth f inch; two - lobed, outer the 

 longer, separated by a shallow groove ; inferior 

 surface smooth ; anterior end opened by a sharp- 

 arched border immediately above the inferior sur- 

 face ; posteriorly the tympanic was united by a 

 constricted neck to an irregular piece of bone, 

 formed of light cancellated tissue, which probably 

 represented a " mastoid." Periotic l^Vr inch long, 

 I inch broad ; internal meatus with a cribriform 

 wall for transmission of auditory nerve ; tympanic 

 aspect with fenestra ovalis and f. rotunda.] 



Subfamily ZIPHIIN^. 



(Beaked Whales.) 



Beak in the head bounded behind by rounded 

 eminence in front of nares. Blowhole single, 

 mesial, crescentic. One or rarely two pairs of 

 functional mandibular teeth. Numerous unde- 

 veloped teeth in gums. Caudal fin convex in 

 middle of posterior border. 



