BEAKED WHALES, FAMILY ZIPFTIID^ TRITE. 



69 



Dimensions of five ikulls of Berardius hairdii (including the type) and of three skulls of B. arnuxii — 



Continued. 



Measurements. 



B. arnuxii. 



New 

 Brighton, 



New- 

 Zealand 



1808 

 (Flower). 



No. 3. 



I 



New 

 Zealand 



(V. B. 



and 



Gerv.). 



(Type). 



Length of portion of vomer visi- 

 ble on palate 



Length of nasals (greatest, me- 

 dian, straight ) 



Breadth of nasals (greatest) 



Breadth of anterior nares 



Breadth of foramen magnum 



Breadth across occipital condyles. 



Breadth of each condyle 



Height of each condyle 



Length of mandible 



Length of symphysis 



Height at coronoid 



Distance from tip of jaw to center 

 of first tooth 



Distance from tip of jaw to center 

 of second tooth 



102 

 74 

 61 



191 



" 1, 245 

 310 

 2U 



21511, 

 U.S. 



N. M., 

 New 



Zealand 



young. 



mm. 

 420 



2o3± 



162(?) 134 

 180 



102 



213 



B. bairdii. 



49726, 



St. 

 George 

 Island, 

 female, 



adult. 



535 



49725, 

 Center- 



ville, 



Cali- 

 fornia, 

 male(?) 



adult. 



20992, 

 Bering 



Island, 

 (Type). 



1,236 

 294 

 222 



mm. 

 370 



118 

 97 

 98 

 82 

 228 

 104 

 171 

 1,289 

 295 

 230 



48 



135 

 105 

 96 

 84 

 240 

 108 

 168 

 1,282 

 270 

 223 



49727, 



St. 

 George 

 Island, 



male, 

 young. 



Mounted 

 slnjll, 

 Bering 



Island(7) 

 (Greb- 

 nitzki?). 



300± 



98 

 90 

 83 

 83 

 195 

 83 

 142 

 '>883 

 I- 145 

 175 



622 



142 

 105 

 100 



71 

 235 



98 

 178 

 1,360 

 310 

 245 



a " Length of ramus.' 



d About 27 mm. lacking from tip of mandible. 



The foregoing measurements indicate a considerable variation in proportions 

 among the different individuals, but there appears to be nothing that can be fixed 

 upon in this small series to distinguish the two species by dimensions alone. 



EARBONES. 



The tympanic and periotic bones of B. hairdii (Pis. 34-.37) present a number 

 of characters by which they may be distinguished from those of B. arnuxii. Wliile 

 of about the same size in both species, the two bones when in the natural position, 

 viewed from without, are nearly square rather than triangular in outline in B. 

 hairdii, the superior border of the periotic being nearly parallel with the inferior 

 border of the tympanic, and the anterior lobe of the periotic being turned down 

 nearly at right angles with the rest of the bone. The periotic is shorter anteriorly 

 than" the tvmpanic in B. hairdii, wliile the reverse is true in B. arnurii. In the 

 former speJies the eustachian canal of the tympanic is wider, the distance between 

 the outer and inner lips being greater. The involuted portion of the iimer hp is 

 shorter and differently shaped. The groove between the postero-inferior lobes is 

 wider. The periotic beside having a much shorter anterior lobe than in B. arrmm 

 has also a smaller and smoother middle lobe, and the internal auditory meatus is 

 smaller and more oblique. The dimensions of the bones in the Centerville beach 

 skull. No. 49725, are as follows: Tympanic: greatest length, 62 mm.; greatest 



