34 



W. LlLLJEBOEG, 



The lower arm-bones (radius and ulna) (PI. VIII. fig. 64, the right) 

 are in form not quite so elongated as those bones usually are in Balaenop- 

 teridae, but in other respects present nothing- remarkable, except that the 

 ulna has a very large olecranon, conically pointed at the upper part. Both 

 have the anterior edge convex and the posterior concave, and the lower 

 end of the radius reaches below that of the ulna. The rectilinear length of 

 the radius is 2' 5|-"; that of the ulna between the articular surfaces 2' 24"; 

 breadth of radius in the middle G|"; d:o of ulna 4". 



Of the carpal-bones or bones of the carpus six have been found (PI. 

 VII. figg. 65 — 70), of which however one is very small and has only one 

 surface complete. As they vere found in the immediate neighbourhood of the 

 right lower-arm-bones it seems probable that they belong to the right pec- 

 toral tin. The same is the case with the four metacarpal bones that have 

 been discovered (figg. 71 — 74), and the four phalanges that have been 

 found, and of which the three are here represented (figg. 75 — 77). The 

 metacarpal-bones are comparatively short and thick, and have probably 

 had their respective positions from the innermost to the outermost in the 

 order indicated by the numerical series, and the number of fingers was 

 accordingly only 4, as in other Balaenopteridae. Their respective lengths 

 arc: N:o 71 54"; N:o 72 6}"; N:o 73 5f-" and N:o 74 5j". The phalanges 

 (figg. 75 — 77). It is scarcely possible to assign to these their respective 

 positions. Besides the 3 here represented a 4 th , as we have already inti- 

 mated, has been found. It is exactly like the largest of these. The length 

 of this last is 6}", that of the next in size 5|", and that of the smallest b\". 

 The two largest are comparatively thicker, and the section through the 

 middle is oval, but the two smaller ones are more flattened, and from this 

 we may conclude that they have been situated farther from the base of the 

 fingers, whereas the larger ones were probably basal-phalanges. 



We may conclude from the proceeding description that, among the 

 discovered bones, the under jaw-bones, the cervical vertebrae, the sternum 

 and scapula arc those whick present the distinguishing features of the Ge- 

 nus Eschrichtius , which has been constituted by J. E. Gray for this Whale. 

 We therefore characterize that genus as follows: 



Genus ESCHRICHTIUS , J. E. Gray. 



Proceedings of the Zoological Society 1865. 



Maxilla inferior processu coronoideo brevissimo , tuberculiformi, et alti- 

 tudine maxima ad condylum posita; ramis antice valde tortuosis. Atlas eras- 



