165 



LAGOPUS. PTARMIGAN, 



Bill short and strong, slightly curved. Upper mandible hav- 

 ing its dorsal outline arcuato-declinate, the ridge broad and 

 convex, the sides convex towards the end, the edores straisfht 

 and ascending to beyond the nostrils, where they are inflected, 

 then declinate, sharp and overlapping, the tip rounded and 

 thin-edged. Lower mandible narrower than the upper, its 

 anofle broad and rounded, the dorsal outline straiorht, the back 

 broadly convex, the sides nearly erect and convex, the edges 

 arched, thin, and erect, the tip rounded. 



Mouth narrow ; upper mandible concave internally, with a 

 prominent soft central ridge and four convergent lines ; lower 

 mandible concave, with a broad central groove, and two promi- 

 nent lines. Palate flat, with two curved slightly papillate soft 

 ridges, from which a papillate flap proceeds to the middle of 

 the nasal aperture, and another curves behind it. Aperture of 

 the posterior nares oblong behind, anteriorly linear, its edges 

 papillate ; the anterior space defined by the soft ridges covered 

 with several transverse rows of pointed papilla?, the posterior 

 space sparsely covered with smaller papilloe. Tongue short, 

 triangular, flat above, papillate at the base, horny beneath at 

 the end, acute. Two masses of mucous crypts in the angle of 

 the lower jaw ; also a series on the lower side of the tongue on 

 each side, and a great quantity in the space between the root 

 of the tongue and the aperture of the glottis. The latter is de- 

 fended behind by two transverse flaps of pointed papillae. 



(Esophagus, Plate VI, Fig. 1, «, 6, c, c?, ^, narrow at its two 

 extremities, enlarged or opening into a crop of great size, lying 

 over the fore part of the neck and thorax. In its whole extent 

 it is abundantly supplied with mucous follicles, as is the crop 



