I^o SHUFELDT. [Vol. XVII. 



these structures agree with the corresponding ones as they 

 occur in 5. ahico, only being relatively a little smaller. The 

 auricular openings may be said to be quite wide, and have a 

 reniform outline. On the right side, where the opening is 

 the larger, it has, in an adult specimen (collected at Lojten, 

 Nov. I, 1881), a vertical height of 26-28 mm. and a width of 

 about 14 mm. The aperture upon the left side is somewhat 

 smaller, the height being 23 mm., the width about 14 mm. 

 Comparatively speaking, they are placed pretty well up on the 

 side of the head, inasmuch as on the right side the lower end 

 descends to a point slightly below the inferior arc of the globe 

 of the eye ; superiorly, they are carried up, upon either side, 

 to a point in the same plane with the top of the eyeball. 



The hinder border of either auricular opening is, as in 

 S. aluco, bounded by a thickened fold of integument, infe- 

 riorly. An asymmetry of the ear-flaps, also agreeing with what 

 we find in S. ahico, is present; on the right side, where the 

 aperture is the larger, it is broad ; both above and below it is 

 transversely truncated, and, upon the whole, has a consider- 

 able breadth, which corresponds in size to that of the ear- 

 opening. On the left side the flap is somewhat irregularly 

 drawn downwards, and terminates in a shorter projection, 

 though it still agrees with what we find in S. aluco. The 

 nostrils are of medium size, oval, and with their breadth and 

 height about equal (nearly 4 mm.). The cranium, which is 

 almost but not completely symmetrical, is, in its main char- 

 acters, like the cranium of 5. aluco, although the mandibular 

 portion is more powerfully developed as compared with the 

 cranium, and the orbits are comparatively smaller. The asym- 

 metry, to which reference has been made, and which is almost 

 imperceptible, is due to the fact that the osseous crest of the 

 squamosal bone is inclined slightly more forwards upon the 

 right side than it is upon the left, thus foreshadowing the very 

 decided asymmetry which will be found to be present in these 

 structures in S. lapponicum. The greatest vertical height of 

 the cranium is at a point posterior to the orbital cavities. 

 The bill is moderately long, though not of a powerful build ; 

 it will enter twice into the total length of the cranium, measur- 



