576 LARUS CANUS. 



rather slender than stout, with the neck of moderate length, 

 the head rather large, ovate, and anteriorly narrowed. 



The hill is considerably shorter than the head, moderately 

 stout, compressed, rather higher at the angle than at the 

 hasc ; the upper mandible Avith the dorsal line straight for 

 half its length, then arcuato-declinate, the ridge convex, the 

 edges direct, very thin, nearly straight, arched toward the 

 end, the tip rather acute ; the lower mandible with the angle 

 long and narrow, the prominence small, the dorsal line 

 ascending and slightly concave, the sides nearly erect and a 

 little convex, the edges somewhat inflexed, very thin, a little 

 decurved toward the point, which is very narrow. 



Mouth ten-twelfths in width ; palate with two very pro- 

 minent papillate ridges, and intervening reversed papillae, its 

 anterior part with a medial papillate ridge and two lateral 

 elevated lines. Tongue an inch and a half long, emarginate 

 and finely papillate at the base, narrow, trigonal, tapering to 

 a slender slit point. The oesophagus is nine inches long, an 

 inch and a quarter in width, contracting to one inch, and 

 again enlarging to an inch and five-twelfths. The belt of 

 proventricular glandules is eleven-twelfths. The stomach, 

 although small, being only one inch in external diameter, is 

 a true gizzard, having the lateral muscles strong, the tendons 

 large, the epithelium dense and prominently rugous. The 

 intestine is three feet three inches in length, from four- 

 twelfths to two-and-a-half-twelfths in width ; the coeca seven- 

 twelfths long, two-twelfths in breadth ; the length of the 

 rectum three inches *, the cloaca globular. 



The nostrils are linear-oblong, four-and-a-half-twelfths 

 long ; the eyes rather small. The feet arc rather short and 

 slender ; the tibia bare for half an inch ; the tarsus com- 

 pressed, with twenty-six narrow, curved scutella. The hind 

 toe is very small, with two scutella ; on the second toe are 

 about twenty, on the third thirty-six, on the fourth thirty- 

 four. The interdigital membranes are emarginate, the soles 

 flattened, and the margins thick and prominent. The claws 

 are small, compressed, arched, rather blunt, that of the third 

 toe much curved outwards, with its inner margin moderately 

 expanded. 



