1870.] PROF. W. H. FLOWER ON ©LURUS FULGENS. 759 
which the sterno-thyroideus muscle is attached. The posterior 
border is convex, and elongated to the length of half an inch from 
above downwards by the development of the superior and inferior 
cornua. ‘he cricoid cartilage is continuous across the middle line in 
front, but very narrow (not more than ‘1'') from above downwards ; 
posteriorly it widens to *4!’; it is convex externally at the sides, the 
upper and lower margins being much everted. 
The thyroid bodies are each of a flattened, irregular oval form, 
lying on the sides of the trachea, extending from the lower edge of 
the cricoid cartilage to the sixth tracheal ring, and connected together 
below by a long and narrow band, which passes across the front of 
that ring. The greatest length of each of these bodies is ‘7", the 
greatest width -5''; and the band which connects them is *5" in 
length. 
The hyoid bones (fig. 4) consist of a basihyal (4/), forming a 
broad arch, deeply emarginate behind, °4! wide from side to side. 
The anterior cornu has three bones in close contact. The stylo-hyals 
(sh) are slender, -6" long, and very slightly curved. The epihyals 
(eh) are shorter and broader, especially at the lower ends, where they 
Fig. 4. 
to) 
sh 

wi 
~ bh 
Anterior view of hyoid bones; natural size. 
sh. Stylo-hyal. eh. Epihyal. ch, Cerato-hyal. bh. Basihyal. th. Thyro-hyal. 
are expanded and flattened ; they are*4" long. The cerato-hyals (ch) 
are nearly as broad as long, with a strong crest on the anterior su- 
perior border. The thyro-hyals (¢) are compressed, broad at their 
basal and narrow at their thyroidal extremity, slightly curved up- 
wards, and °45" in length. 
Tsoracic VIscERA. 
The trachea is 43" in length, and 3" in average width. It has 
thirty-eight cartilaginous rings. The musculo-membranous space 
behind the ringsis 2" wide. It divides into two short bronchi, each 
of which divides again into an upper and lower branch as it enters 
the root of the lung to which it is destined; the left bronchus 
is slightly longer, and not so capacious as the right. 
Proc. Zoou. Soc.—1870, No. LI. 
