Ring or rings, fibrous, of heart of horse, 534

Rings or ring, fibrous, of intervertebral fibro-cartilages, 173

inguinal, external, 246, 250

internal, 248, 249

muscular, of cæcum, 365

of trachea, 450

peritoneal, 490

portal, 372

preputial, 497

subperitoneal, 490

vaginal, 248, 290

of ox, 500