56 



COMMON GANNET. 



inches, f g, is then recurved for 3 

 inches, g, h, ascends for 4 inches, h, i, 

 and receives the biliary ducts, then 

 passes toward the spine and forms a 

 curvature. The average diameter of 

 the intestine is 5 twelfths at the upper 

 part, and it gradually contracts to 3 

 twelfths. The rectum, k, measured to 

 the anus, is 5i inches. It gradually 

 enlarges from 4 to 6j twelfths. The 

 cloaca, m, is globular, 9 twelfths long, 

 S twelfths broad. The cceca are 3 

 twelfths long, 1^ twelfths broad. 



The lobes of the liver are extreme- 

 ly unequal, as is always the case when 

 the stomach or the proventriculus is 

 excessively large, the right lobe being 

 2f inches long, the left 1 inch and 8 

 twelfths. The gall-bladder, n, is very 

 large, of an oblong form, rounded at 

 both ends, 1 inch and S twelfths long. 

 The trachea is 12 inches long, 

 moderately ossified, round, its diame- 

 ter at the top 7 twelfths, gradually 

 narrowing to 4 twelfths; the rings 

 124, the lower 4 united. The bronchi are large, their diameter greater than 

 that of the lower part of the trachea; of 25 cartilaginous half-rings. The 

 lateral or contractor muscles of the trachea are of moderate strength; the 

 sterno-tracheals strong; a pair of inferior laryngeal muscles attached to the 

 glandular-looking, yellowish-white bodies inserted upon the membrane 

 between the first and second rings of the bronchi. 



The olfactory nerve comes off from the extreme anterior point of the 

 cerebrum, enters a canal in the spongy tissue of the bone, and runs in it 

 close to the septum between the eyes for 10 twelfths of an inch, with a 

 slight curve. It then enters the nasal cavity, which is of an irregular trian- 

 gular form, 1^ inches long at the external or palatal aperture, 10 twelfths in 

 height. The supramaxillary branch of the fifth pair runs along the upper 

 edge of the orbit, and by a canal in the spongy tissue of the bones, enters 

 the great cavity of the upper mandible, keeping nearer its lower surface, and 

 there branching. This cavity appears to have no communication with the 

 nasal; nor has the latter any passage towards the obliterated external nostrils. 



