1900.] 



SOFT ANATOMY OP THE MUSK-OX. 



159 



3 cm. broad interspace between their dorsal ends \ This interspace 

 is occupied only by soft tissues. The dorsal surface is thus, instead 

 of showing a median edge as in other Cavicornia, flat or even a 

 little concave. The cartilages are ventrally thicker, but end 

 dorsally in thin edges. The ventral portion of the rings is usually 

 7-8 mm. broad, but towards the sides, where they partly overlap 

 each other in the antero-posterior direction, they become broader 

 (15-20 mm.). 



The lungs of the Musk-ox show on the right side the same 

 division into lobes as in other Cavicornia (Bos, Ovis, Capra) and 

 in Cervicornia (Cervvs elaphus, Damn, Capreolus, and Rangifer), 

 but the left lung differs (fig. 12) from all the material (of Euminants) 



Fig. 12. 



Lung of the Musk-ox. 



on hand except Lama glama. The left lung is quite simple, the 

 upper lobe sitting with a broad base on the lower, and there being 

 no trace of a middle lobe (see fig. 12), which latter in the Eu- 

 minants (except Lama) enumerated above is very deeply cleft from 

 the lower lobe. Ovibos has thus in this, respect, a very isolated 

 position. The lungs are distinctly lobulated as in Bos. 



1 A similar condition is said to take place in the Yak (Bos grunniens Linn.) 

 according to Pagenstecher (Allgem. Zoologie, vol. iii. p. 384). 



