218 



AMERICAN RING PLOVER. 



being 5 twelfths, at the distance of 1 

 inch 4 twelfths; the proventriculus, 

 b c, 4 twelfths in breadth, its glan- 

 dules forming a belt 6 twelfths in 

 breadth. The stomach, c d e, is ra- 

 ther large, roundish, compressed, 9 

 twelfths in length, 10 twelfths in 

 breadth; the lateral muscles 5 twelfths 

 in thickness; the epithelium remark- 

 ably dense, thick, with two broad 

 granulated ridges on each side, form- 

 ing grinding surfaces. The intestine, 

 e f g h, is rather short, and wider 

 than in the other species; its length 

 9j inches, its width at the upper part 

 4 twelfths, diminishing to 2 twelfths. 

 Coeca 1 inch 4 twelfths long, cylin- 

 drical, 1 twelfth in width; their dis- 

 tance from the extremity 1^ inches. 

 Trachea 2i inches long, flattened, 

 from 2 twelfths to 1 twelfth in 

 breadth; its rings about 90, cartilagi- 

 nous. Bronchial half rings about 15. 

 Lateral and sterno-tracheal muscles 

 strong; a single pair of inferior la- 

 ryngeal muscles. Adult male. 



AMERICAN RING PLOVER. 



~f Charadrius semipalmatus, Bonap. 

 PLATE CCCXX.— Male and Young. 



I have had great pleasure in observing the migrations of this species, par- 

 ticularly in early spring, when great numbers enter the southern portions of 

 the United States, on their way northward, where it is now well known to 



