920 PRINCIPAL SIR WILLIAM TURNER ON 
with the inner surface flattened and the outer surface vertically convex ; its girth was 
8% inches (fig. 25).* 
The Lachrymal bone was a plate 134 inches long, interposed between the external 
or orbital bar of the frontal and the apex of the triangular plate of the superior maxilla, 
Fie. 25,—Orbit. 
which lies parallel to and immediately in front of the orbital bar of the frontal. Its 
attachment was so slight that it could easily be drawn out of its place, when it was seen 
to be flattened, thin and friable; it was 1? inch broad in its upper third, narrowing 
materially at its lower end; the outer border, which appeared in the narrow cleft 
between the frontal and superior maxilla, was thickened and moderately strong ; the 
inner border was thin and papyraceous. 
SUMMARY. 
The specific differences between Balena biscayensis and B. mysticetus may be 
summarised as follows :— . 
The adult biscayensis was neither so long, nor with so great a girth, nor did its 
head bear so large a proportion to the total length of the animal as in mysticetus. The 
blades of baleen were not so long; the mouth was not so large in proportion ; the colour 
was more uniformly black, though a small percentage of the animals examined had 
large white patches on the ventral surface; the “ bonnet” was distinct at the end of 
the snout. 
* If this figure is compared with that of the orbit of a young Balena japonica in REINHARDI’S memoir on 
Escuricu?’s collection, Vidensk. Selsk. Skr., 5 Rekke, Copenhagen, 1869, their close resemblance may be noted. 
