1869. ] ANATOMY OF PROTELES. 485 
have, unfortunately, not the materials at hand for a comparison with 
the larynx of an Hyena. 
The thyroid bodies are unconnected with each other. Each is 
flattened, subtriangular, broad at the upper end, which reaches just 
above the lower border of the cricoid cartilage, and ending in a nar- 
row tongue-shaped inferior prolongation. The entire length is 1!'"1, 
the greatest breadth °4". 
The hyoid arch consists of the number of bones usual in the Car- 
nivora. The basihyal is straight and narrow, nearly flat in front, 
rounded and slightly concave (from side to side) behind, expanded 
at the ends, *8" long. The thyro-hyals are slightly curved, thick at 
their basal, and flattened and expanded at their thyroidal ends, -8!". 
The three bones of the superior cornu are of equal length, -6"; the 
distal, or that nearest the basihyal, is the stoutest, and has a promi- 
nent flattened expansion of the inner border, the edge of which is 
turned backwards; and the whole bone has a considerable inward 
curve. The middle bone is simple, flattened, and slightly curved ; 
the proximal (stylo-hyal) is very slender, except at the extremities, 
slightly curved, and twisted upon itself. 
Tuoracic VISCERA. 
The trachzea is 5! in length, and °55" in average width. It has 
thirty-six cartilaginous rings. It divides into two very short bronchi, 
which pass off nearly horizontally, and after a course of not more 
than 3" enter tie roots of the lungs, each dividing into as many 
branches as there are lobes to the lungs. The right bronchus is 
rather shorter than the left. 
The lungs are deeply divided into distinct lobes—the right into 
four, the left into three. ‘The mode of division is as follows:—A 
horizontal fissure separates each lung into two nearly equal portions ; 
the lower one, slightly the larger, has no further division ; the upper 
one is separated into two by a fissure running obliquely downwards 
and backwards from the middle of the anterior border to join the 
horizontal fissure near the posterior border of the lung; this sepa- 
rates from the upper a middle lobe, which is the smallest of the 
three. These divisions and lobes are almost exactly similar on the 
two sides; but the anterior margin of the left middle lobe has two 
deep notches, altogether wanting in the right. 
On the right side a distinct lobe (the “azygous lobe’’) is super- 
added, having no corresponding portion on the leit. It is triangular, 
about the size of the middle lobe, and placed on the inner side of 
the lung, its root bemg between those of the middle and inferior 
lobes. It lies to the inner side of the latter, behind the heart. 
This arrangement of the lung-lobes is that which obtains in the 
Carnivora generally. In the lungs of an Hyena (H. striata’), No. 41, 
Stores, Mus. R. C.S., the divisions are precisely similar, except that 
the clefts on the anterior edge of the left middle lobe are wanting. 
The same is the case in the lungs of an Herpestes. 
The heart is short and broad. ‘The aortic arch, as usual in the 
