Rh. chrysopygus, [516]

Rhynchogale, [410]

Rhynchomys, [474];

Rh. soricioides, [474]

Rhynchonycteris, [531]

Rhytina, [338]

Ribs, [29];

single-headed, of Whales and Monotremes, [30]

Risso's Dolphin, [375]

River Hog, Red, [278]