ANATOMY AND PHYSIOLOGY OF THE HORSE ; S FOOT. 665 
from the other enlargement by a somewhat deep and narrow 
channel or fissure (fig. 12, b). This part has been named the 
“ perioplic ring/' from its secreting the “ periople ” or 
Fig. 12. — The horse’s foot with the hoof removed, a. Perioplic ring. 
b. Perioplic or coronary fissure, c. Coronary cushion, d. White zone. 
e. Villi of the coronary cushion, f. Vascular laminae, g. Laminae 
terminating in villi, h. Plantar cushion covered with villi. 
so-called “ coronary frog-band,” a horny structure that will 
be referred to presently, when speaking of the hoof. By 
suspending the foot in a glass vessel filled with water, it will 
be found that the surface of this ring is closely studded with 
the most delicate points that project like tufts of the finest 
silk velvet, and are scarcely visible to the naked eye. 
Examined with the microscope, the ring is found to be highly 
organized, being abundantly supplied with blood vessels, and 
the hair roots at its upper margin have an ample supply of 
sebaceous glands to keep these and the horny band proceeding 
from it in a pliant and elastic condition. The nature of the 
tufts garnishing its whole face so evenly and closely will be 
examined immediately. 
