2(12 



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 doubtless 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 



