142 
LITTLE GUILLEMOT. 
sides and fore part of the neck white, irregularly barred with blackish- 
grey ; the upper parts of a duller black than in summer. 
There is nothing very remarkable in the anatomy of this bird, beyond 
what is observed in the Auks and Guillemots. The ribs extend very far 
back, and, having the dorsal and sternal portions much elongated, are 
capable of aiding in giving much enlargement to the body, of which the 
internal, or thoracic and abdominal cells are very large. The sub-cutaneous 
cells are also largely developed, as in many other diving and plunging birds. 
The roof of the mouth is flat, broad, and covered with numerous series of 
short horny papillae directed backwards. The tongue is large, fleshy, 10 
twelfths of an inch long, emarginate at the base, flat above, horny on the 
back. The heart is large, measuring 10 twelfths in length, 8J twelfths in 
breadth. The right lobe of the liver is 1 T \ inches in length, the left 1 T V ; 
the gall-bladder is elliptical. The kidneys are very large. 
The oesophagus, Fig. 1, a b c, is 3 inches 10 twelfths long, its walls very 
Fig 1. Fig. 2. 
