Material for the Study of Ruminants. 



11 



bos as well as from the- very elongate spleén of the common ox and 

 of the Gnu. 



The glandula thyreoidea of the Black-buck consists of two distinct 

 portions without any trace of an isthmus. Each body is elongate!) 

 beanshaped, about 20 nun. in length, 9 in breadth and 5 in thickness. 

 They are situated on the dorsilateral side of the trachea rather close 

 to the oesophagus and a little behind the cricoid cartilage. 



The lungs of the Black-buck are divided into the same lobes 

 as those of the common goat hut comparatively more deeply cleft. 



The cartilaginous rings of the greater part of the trachea do 

 not meet behind, which is also the case in the Saiga according to 

 Mi kie 1 ). The fibrous interval is. however, in this animal not broad, 

 as it is stated to be in the latter, but quite narrow. The rings aie 

 thickest in front and become gradually thinner towards the sides and 

 are finally angularly bent so that the anterior surface is rounded the 

 posterior flat. A section of the trachea is thus semicircular. This 

 description holds good for the upper or anterior part of the trachea, 

 luit ou a level with the tips of the lungs the condition is altered so 

 that the rings meet behind and form an edge which becomes sharper 

 and more pronounced posteriorly. 



The larynx (Pl. J fig. 1) is rather elongate and compared with 

 that of a common goat it is large. In its general shape it resembles 

 the same organ of the Saiga as figured by Murie. The length of the 

 whole organ in this young Black-buck is about 54 mm. and its dorsi- 

 ventral diameter through pomum adami is about 32 mm. This latter 

 prominence is more bluntly rounded than in the common goat but not 

 so much so as in the Saiga. Its apex is situated about 1 cm. from 

 the hindmargin and this measurment is contained nearly three times in 

 its distance from incisvra thyreoidea superior. This makes a great dif- 

 ference from the condition found in the common goat in which the 

 anterior portion of the thyreoid cartilage equals or is at most IV2 

 times as large as the posterior one. In the Saiga again, as in this 

 animal, the anterior portion of the thyreoid cartilage is very long. 

 Connu/ superiora are directed forwards their axis being parallel to the 

 longitudinal diameter of the larynx. Their length is about 7 mm. 

 They are rather narrow and in shape more similar to those of the 

 Saiga than to those of the Gapra. Gornua inferiora are somewhat 



*) Proc. Zool. Soc. London 1870 p. 495. 



