458 



MANUAL OF ZOOLOGY 



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 



,a.u.ap 



\ -\ 



alsp / *\* / 



czdclgrmcc 

 prdg.rmg ;/, 



^;iii\\\\\\\\\-x^' 



\ \ \ \ \ \ \ \ ; 

 \ 



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

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

 an afi, auditory aperture; cb. rmg, cubital remiges: r/-,cere; dg. /, 2, J, digits 

 ofmanus; dg /', 2', j', ^', dibits of pes; hu pt, humeral pteryla; Ig, ligament 

 of remiges; md. dg rmg, mid-digital remiges; tia, nostril; net. ;», nictitating 

 membrane; 0. gl, oil gland; pr. dg rmg, pre-digital remiges; pr ■. ptgin \ pre- 

 patagium; pt 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. 



