51) 



ElNAE LÖNNBEEG, 



surface. Its length is about 1<>. its breadth about 11 and its thick- 

 ness about 6 mm. It must thus be termed, comparatively, very small. 

 The mosf interesting feature with regard to the thyreoidea of this 

 animal is. however, that it is provided with an isthmus. This has a 

 width of almost 3 1 2 mm. when it leaves the main lateral body of the 

 thyreoidea, but proceeding transversally along the surface of the tra- 

 chea it is gradually narrowed so that it hardly can be traced macro- 

 scopically across the median line. This is a feature which reminds 

 • me abouf the condition prevailing in Bos in which the isthmus is well 

 developed while in no species of antelope investigated by me such an 

 isthmus could be traced. It may thus to a certain extent be regarded 

 as a bovine characteristic. 



The larynx of the Anoa is very small. Taken as a whole it 

 measures only 47 mm. in length and its dorsiventral diameter through 

 pomum adami is only 83 mm. The length of cartilago thyreoidea is 

 laterally 36 mm. Pomum adami forms a rather broad and flattened 

 area, triangular in outline. Its apex is situated on a distance of II 

 mm. from the hindmargin, 20 mm. from incisura oratis. This triangular 

 area is hard and ossified while the other parts have the usual cartilagi- 

 nous consistency. The most remarkable fact concerning this cartilage 

 is that the cornua anteriora are coalesced with the main cartilage in 

 such a way that (as in the horse) a foramen thyreoideum is formed. 

 Such an arrangement I have not seen in other Ruminants. The cornua 

 ■posterior*! are long (15 mm.) and arcuate. The dorsal plate of the 

 cricoid cartilage has a rather strong keel and measures about, 30 mm. 

 in length. The epiglottis is broad with rounded outline thus resembling 

 the same organ of the Gnu 1 ), but differing from the triangular one of 

 Bos etc. From this description and the figure (fig. 17) may be seen 

 that the larynx of the Anoa does not closely resemble the same organ 

 of other Ruminants as far as is known. 



The tracheal rings are thinner behind, and meet dorsally in such 

 a way that an edge is formed, as is also the case in the common ox 

 and the Gnu. 



The number of tracheal rings is quite small, only 48. which is 

 the smallest number indicated by Ellenbergee k Baum 2 ) for any 

 domesticated ruminant. The small number of tracheal rings of the 



') Lönnberg: Studies on Ruminants. K. Vet. Akad. Handl. Bd. 35. 

 ) Handbuch der vprsl. Anat. d. Hausthiere. Berlin 1900. 



