BEAKED WHALES, FAMILY ZIPHIIDiE TRUE. 



15 



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

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

 the alveolus 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. europseus differs from that 

 of M. hidens in the relative shortness of tiie 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 tiro other skulls of Mesoplodon eiiropxiis. 



Measurements. 



English 



Channel. 



type," 



adult. 



Total length 



Length of rostrum 



Tip of beak to posterior end of pterygoids. . 



Height from vertex to end of pterygoids 



Breadth between orbits 



Breadth between zygomatic processes 



Breadth at anteorbital notches 



Breadth of beak at middle 



Depth of beak at middle 



Greatest breadth of prema.\ill:e proxiinally 



The same, in front of anterior nares 



Breadth of anterior nares 



Length of temporal fossae 



Breadth between temporal fossir- 



Breadth of foramen magnum 



Length of mandible 



Length of symphysis 



Greatest depth of mandible 



762 

 459 

 561 

 C292? 

 327 

 300 

 210 



66 



54 

 168 

 111 



51 

 102 

 228 



42 

 G54 

 135 

 120 



North 

 Long 

 Branch. 

 New Jer- 

 sey, fe- 

 male, 

 adult. 



mm. 



m 



283 

 1^325 

 «325 



205 



147 

 99 

 45 

 115 

 212 

 34 



.\tlantle 



City, New 



Jersey. 



23346 



U.S.N.M., 



male, 



young. 



675 

 427 

 525 

 256 

 ii2,S7 

 302 

 /182 



60 



40 

 142 

 104 



42 

 101 

 208 



34 

 565 

 116 

 101 



a Dimensions taken from Van Beneden and Gervais' figures. 



i> Beak lacking. Length from occipital condyles to base of beak (straiglit ). 312 mm. 



c Pterygoids broken. 



d At middle. 



'Estimated. One zygoma is broken. 



/ Least. 



VERTEBRA. 



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

 City specimen of M. europseus is as follows : 



M. europseus. 

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



M. hidens. 



Landenaes. 



F8e0 



Udsire 



