458 



MANUAL OF ZOOLOGY 



SECT. 



origin to the group of large feathers (ret) to which the word 

 " tail " is usually applied. On the dorsal surface of the 

 uropygium is a papilla bearing on its summit the opening of 



FIG. 273. Columba livia. The entire animal from the left side with most of the 

 feathers removed ad. dg. rmx, ad-digital remex; al. sp, ala spuria; an, anus: 

 au. ap, auditory aperture; cb. ring, cubital remiges; cr, cere; dg. I, 2, $, digits 

 ofmanus; dg /', 2', 3', 4, digits of pes; hu fit, humeral pteryla; Ig, ligament 

 of remiges; md. dg rmg, mid-digital remiges; na, nostril; net. m, nictitating 

 membrane; o. gl, oil gland; pr. dg. rmg, pre-digital remises; pr. ptgm , pre- 

 patagium; //. ptgm, post-patagium ; ret, mesial rectrix of right side; ret', sacs 

 of left rectrices; sp- pt, spinal pteryla; ts. mtts, tarso-metatarsus; v. apt, 

 ventral apterium, or featherless space. 



