BEAKED WHALES, FAMILY ZIPHIID^ TRUE. 



15 



In the Atlantic City specimen the axis of the tooth where it emerges from 

 the alveohis is 91 mm. from the end of the jaw. The portion of the tooth above 

 the alveohis is 11 mm. long at the base and 12 mm. high. It is conical and sharp 

 pointed, and is inclined forward and a little outward, especially at the tip. At the 

 alveolus the transverse breadth of the tooth is 5 mm. The much larger tooth 

 in the type indicates that that specimen was a male. 



The mandible of the Atlantic City specimen of M. europieus differs from that 

 of M. bidens in the relative shortness of the symphysis, the large number of mental 

 foramina, the more anterior position of the tooth, and the direction of the crown, 

 which is forward instead of backward. 



Dimensions of the type and tuo other skulls of iksoplodon eiiropxus. 



Measurements. 



Total length 



Length of rostram 



Tip of beak to posterior end of pterygoids. . . 



Height from vertex to end of pterygoids 



Breadth between orbits 



Breadth between zygomatic processes 



Breadth at anteorbita! notches 



Breadth of bealc at middle 



Depth of beak at middle 



Greatest breadth of premaxillas proximally. 



The same, in front of anterior nares 



Breadth of anterior nares 



Length of temporal fosste 



Breadth between temporal fossa; 



Breadth of foramen magnum 



Length of mandible 



Length of symphysis 



Greatest depth of mandible 



English 



Channel. 



type.a 



adult. 



ram. 

 762 

 4o9 

 561 

 c292? 

 327 

 300 

 210 



66 



S4 

 168 

 111 



51 

 102 

 228 



42 

 654 

 135 

 120 



North 

 Long 

 Branch, 

 New Jer- 

 sey, fe- 

 male, 

 adult. 



ram. 



2S3 

 ii32S 

 e325 



205 



147 

 99 

 45 

 115 

 212 

 34 



Atlantic 



City, New 



Jersey. 



23346 



U.S.N.M., 



male, 



young. 



675 

 427 

 525 

 25G 

 ■i287 

 302 

 /■182 



60 



40 

 142 

 104 



42 

 101 

 208 



34 

 565 

 116 

 101 



a Dimensions taken from Van Beneden and Gervais' figures. 



' Beak lacking. Length from occipital condyles to base of beak (straight), 312 mm. 



c Pterygoids broken. 



liAt middle! 



'Estimated. One zygoma is broken. 



/ Least. 



VEftTEBR.^;. 



The vertebral formula of three specimens of M. hidens and of the Atlantic 

 City specimen of M. europseus is as follows : 



if. europseus. 

 Atlantic City C. 7; Th. 9; L. 11; Ca. 20=47 



M. bidens. 



Landenws '; l**; H; 19=*^ 



Fse0 7; 9; 11; 19=46 



Udsire 7; 10; 9; 20=46 



