74 



SPECIMENS OF CETACEA. 



the great cavity in the skull in which the spermaceti 

 had been contained. 



11. Teeth, maxillary, fifteen in number. They vary in length 



from 69 to 80 mm. ; some curved, others pointed at 

 both ends ; some have a pulp cavity, others none, 

 others roughened by odontomatous grow^ths. They 

 are obviousl}^ rudimentary and functionless. From 

 the Shetland Cachalot, No. 9. Plate IX. 



12. Tympano-periotic bones, pair of, from No. 9; the bones 



on each side are not fused together. The Tympanic 

 bone is 2^ inches long, 1"6 inch broad. If inch 

 high ; the inferior surface bilobed posteriorly, lobes 

 separated by oblique groove, outer lobe the larger ; 

 outer surface convex and smooth, giving origin to lip- 

 like process which reaches mouth of cavity ; inner 



