ANATOMY OF MEGAPTERA LONGIMANA. 



125 



Van Beneden and Gervais remark (Osteographie des Cetaces, 

 p. 132), " C'est dans la region cervicale surtout que se trouvent les 

 differences qui separent le keporkak de la Megaptera Lalandii." The 

 differences which they go on to note between these two supposed 

 different species, Megaptera longimana and Lalandii, are, so far as I 

 can judge, not greater than those seen in the four series of the cer- 

 vical vertebrae of B. musculus above referred to.] 



THE KIBS. 



The following table (Table VI.) shows the proportions of the 

 ribs in comparison with those of the 50-feet-long B. musculus : 



34. TABLE VI. Measurements of the Ribs of Megaptera longi- 

 mana and of the 50-feet-long B. musculus, given in 

 inches. 



35. GENERAL AND DIFFERENTIAL CHARACTERS. Length- 

 All the ribs of the Megaptera are shorter than those of the 

 B. musculus except the two first. The greater length of 

 especially the first in Megaptera is considerable. The lengths 

 taken along the outer border are, of the first rib, Megaptera 48 

 inches, B. musculus 44J ; of the second rib, Megaptera 65 

 inches, B. musculus 60. The longest rib in both is the 6th. 



1 From top of tubercle to farthest part of lower end. 



2 From top of angle to top of tubercle. 



3 Transversely, from innermost point to opposite the top of the tubercle. 



* The weight of the 6th rib is in Megaptera 228 ounces, in the B. musculus 

 148 ounces. 



