262 



ALLEN: NEW ENGLAND WHALEBONE WHALES. 



over the number occurring in the larger species of the genus. Japha (1911) has described and 

 figured their arrangement as found in a foetus some 700 mm. long. There is but a single row 

 on each side of the snout, and this seems to correspond to the inner of the two rows in the / 

 Common Finback and the Blue Whale. These two rows comprise five bristles each, arranged 

 on a slightly S-shaped line, the posteriormost bristle about on a level with the middle of the 

 blowholes, and set in nearer them than the bristle next in front. In a somewhat smaller foetus 

 Japha found but four on each side, and this agrees with the count in a specimen examined by- 

 van Beneden (1887). On the lower jaw the arrangement is similar to that in the larger 

 Balaenopterae. There are two vertical rows, parallel to each other, at the point of the jaw 

 but the actual number of hairs in each row he does not mention, though to judge from his 

 figure, there are six in each. The true number is doulatless more for Knox (1833-4) found eight 

 distinct bristles in each of the two perpendicular rows of a young specimen. In addition, Japha 

 mentions other smaller scattered hairs at the symphysis, making in all some thirty at the tip 

 of the jaw. The lateral row on the side of each lower lip consists of six or seven bristles. The 

 vibrissal hairs thus total about 38 or 39-. 



External Measurements of 



Tip of snout to notch of flukes 



" " " " angle of mouth 



" " " " anterior corner of eye 



" " " " posterior margin of blowholes 



" " " " anterior " " 

 Eye to anterior insertion of pectoral 

 Length of eye opening 



Length of pectoral fin from anterior insertion to tip 

 Greatest width of pectoral 

 Width of insertion of pectoral 

 I,ength of base of dorsal fin 



" " anterior edge of dorsal fin 

 Greatest heiglit posteriorly of dorsal fin 

 Posterior liase of tlorsal fin to notch of flukes 

 Anus to notch of flukes ventrally 

 Anus to navel 

 Length of mammary slit 

 Width from tip to tip of flukes 

 Width from tip of fluke to median notch 

 Anterior edge of fluke from insertion to tip 

 Tip of snout to pectoral 



" " " " base of dorsal fin 

 Eye to ear opening 

 Greatest girth 



