BEAKED WHALES, FAMILY ZIPHIIDiE TEUE. 



External dimensions of Berardius hairdii and B. arnuxii. 



67 



Measurements. 



Total length 



Distance from tip of snout to blowhole 



Distance from tip of mandible to comer of mouth 



Breadth of flukes from tip to tip 



Length of pectoral fin along outer edge 



Distance from anus to "end of body" 



Height of dorsal fin 



Distance from anterior base of dorsal fin to "end of body '' 



baiTiii. 



49726 

 St. George 

 Island, 

 Alaska, 

 (Judge), 

 female 

 adult. 



40 



per cent. 

 10.8 



6.0 

 25.3 

 12.4 

 29.0 



2.5 

 29.7 



49737 



St. George 



Island, 



Alaska, 



(Judge), 



male 



imm. 



/(. in. 

 25 5 



per c€nX. 

 11.8 



6.9 

 24.6 

 13.4 

 29.8 



2.4 

 29.2 



Wellington, 

 New Zea- 

 land, 

 (Hector), 

 male. 



//. in. 

 27 6 



per cent. 

 12.8 

 n6.1 

 19.1 

 9.4 

 [34.0] 

 3.0 

 [34.6] 



a " Length of gape." 



The measurements of these specimens of hairdii agree well together. The 

 specimen of arnuxii appears to have had narrower flukes, shorter pectoral fin, and 

 a rather higher dorsal fin, situated farther forward than in hairdii. Measurements 

 of a larger number of specimens might show that some or all of these differences of 

 proportion are elusive, but it will be observed that in the Wellington specimen of 

 arnuxii, recorded by Doctor Haast, the breadth of the flukes is only 21 per cent of 

 the total length. The pectoral fin is said to be only 19 inches long, or only 5.2 per 

 cent of the total length, but the manner of taking the measurement is not mentioned. 



As regards size, the largest specimen of B. arnuxii of which I find record is the 

 type specimen. This was 32 feet long, and the skull 1,400 mm., or about 55 inches 

 long. This appears to have been an adult male. The Centerville specimen of 

 hairdii, which was an adult male, was about 41 feet long, and the skull 1,532 mm., 

 or about 60 inches long, while the adult female from St. George Island was 40 feet 

 2 inches long and the skull 56 inches. Although the total length of the specimens 

 of hairdii is so much greater, it vnW be observed that the length of tlie skull, while a 

 little greater, absolutely fails to measure up to the proportions found in arnuxii. 

 It might be suspected on this account that the external measurements of hairdii 

 were exaggerated, but tliat such is not tlie case ■vnll appear from an examination of 

 the measurements of vertebrse given on page 75. It is evident that the specimens 

 of hairdii are far more massive in all parts of the skeleton than the specunen of 

 arnuxii there cited. The same relations will be found upon comparing measure- 

 ments of the specimen of arnuxii figured by Van Beneden and Gervais." The 

 truth appears to be that hairdii is a much larger species, but tliat the skull is 

 considerablv smaller relativelv. 



1 Ost^ographie des C6tac6.s, pi. 23 *>'». 



