BEAKED \VH.AXES, FAMILY ZIPHIID.E TRUE. 



53 



rostrum rather blunt, deeper than wide opposite distal ends of maxillfe; all the bones 

 anchylosed together, but some of the sutures indicated by grooves. Rudimentary 

 alveolar groove nearly obsolete. (PL 17, fig. 2; pi. 19, fig. 2; pi. 21, figs. 1, 5.) 



Rami of mandible anchylosed together at symphysis, the suture indicated 

 only by a groove. Teeth large, broadly conical and tapering at the tip. Root 

 very short, rugose, conical and closed; diameter 29 mm. (PI. 22, fig. 2; pi. 23, 

 figs. 2, 3.) 



The dimensions of the several skulls are as follows: 



Dimensions of ten skulls of Ziphius cavirostris {including the types nf Z. grebnitzhii Clejneger and 



Z. semijunctus Cope). 



a About 150 mm. lacking from end of beak. 



b A little abraded. 



c Taken on a level with the curve of the inner margin of the premaxillfe. 



Is only approximate. 



