OF THE RED CRAG. 



11 



as it approaches the base of the rostrum. The transverse section of the middle of the 

 rostrum (at the part marked 13 in fig. 7) thus gives the figure shown in outhne, by woodcut, 

 fig. 6, in which 14 marks the petrosal production of the ' prefrontals/ 22 the premaxil- 

 laries, 21 the maxillaries, and 13 the vomer. As far as can be judged from the figure 

 of the rostrum in Cuvier's type-specimen of Ziphius cavirostris, it would yield a very 

 similar form of transverse section. 



On the palatal surface of the rostrum of ZipJiius indicus (fig. 7) the premaxillaries 

 (22) alone form the anterior 4| inches; the vomer (13) then appears at the mid-line for an 



Fig. 7. 



Ziphius indicus. l-8tli nat. size. 



extent of 11 inches as a convex ridge, not exceeding 5 lines across at its broadest part. 

 The premaxillaries unite with the first six inches of the exposed tract of the vomer, the 

 maxillaries (21) with the succeeding five inches. About three inches behind the vomerine 

 tract the palatines (20) meet at the mid-line along a suture 2\ inches in extent ; then 

 follow the broad and deep pterygoids (24), extending downward with their lower margins 



