BEAKED WHALES. FAMILY ZIPHIID.E TRTTE. 



69 



Dimensions of Jive !>1'hII.s of Berardius hairdii (mchtding the type) and of three skulls of B. arnuxii- 



Continued. 



Measurements. 



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 



-^r-^^^ 



Zealand 



ises 



(Flower). 



No. 3. 



132 

 102 

 74 

 61 

 191 



a 1, 245 

 310 

 211 



(V.B. 



and 



Gerv.). 



(Type) 



420 



162(?) 

 180 

 102 



21511, 



U..S. 

 N. M., 



New 

 Zealand 

 young. 



253 ± 



134 

 125 

 80 



I 



1,236 

 294 

 222 



B, hairdii. 



49726, 



St. 

 George 

 Island, 

 female, 

 adult. 



135 

 119 

 110 

 85 

 261 

 123 

 193 

 1,334 

 295 

 271 



49725, 

 Center- 



ville, 



Cali- 

 fornia, 

 niale( ?) 



adult. 



20992, 

 Bering 

 Island, 

 (Type). 



lis 

 97 

 9S 

 82 

 228 

 104 

 171 

 1,289 

 295 

 230 



135 

 105 

 96 

 84 

 240 

 108 

 H» 

 1,282 

 270 

 223 



165 



49727, 



St. 

 George 

 Island, 



male, 

 young. 



360± 



98 



90 



83 



83 

 195 



83 

 142 



(-145 

 175 



l>87 



Mounted 

 skull, 

 Bering 



IslandC?) 

 (Greb- 



Ditzki?). 



142 

 105 

 100 



71 

 235 



98 

 17S 

 1,360 

 310 

 245 



195 



a " Length of ramus." 



b 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 sjiecies, the two bones when in tlie 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 tj'inpanic, 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 tympanic in B. hairdii, while the reverse is true in B. arnuxii. In the 

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

 the outer and inner lips being greater. The involuted portion of the inner lip 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. arnuxii 

 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 



