1900.] 



SOPT AXATOMY OP TEE MUSK-OX. 



157 



is in the Sheep complete, and extends posteriorly into the " Nasen- 

 rachen," but in the Calf it is only a ridge. In Copra this septum 

 is well developed, although not quite so strongly as in the Sheep. 

 The same structure as in Bos occurs in Ovibos, as I have seen in 

 the salted head of a Musk-cow, in which this ridge is only 2 mm. 

 broad and 3-4 mm. high. Even with allowance for contraction in 

 the brine, it is evident that the posterior nasal cavity is much less 

 narrowed by the septum membranaeeum in the Musk-ox than in 

 the Ovine group. . This may be gathered from the fact that at the 

 posterior end of the palatum durum the distance between the 

 septum and the lateral wall is nearly 1| cm., while the height of 

 the cavity measures more than 4 cm. 



The larynx of the Musk-ox (fig. 10) is of a very elongate shape. 

 Its greatest length (in a bull), taken as a whole, is 14 cm., but its 



Fig. 10. 



Larynx of the Musk-ox. 



transverse (vertical) diameter is only 9 cm. This great length is 

 mostly due to the great extension of the cartilago thyroidca (more 

 than 11 cm.). It is especially the anterior part which is large, 

 as may be demonstrated from the fact that the distance .from the 

 hind margin to the point of the pomum adami is contained fully 

 three times in the distance from the latter point to the margin of 



