DISCOVERED IN 1921
IN BROKEN HILL CAVE, NORTHERN RHODESIA 178
Photo: British Museum (Natural History).

A CROMAGNON MAN OR CROMAGNARD, REPRESENTATIVE OF A STRONG
ARTISTIC RACE LIVING IN THE SOUTH OF FRANCE IN THE UPPER
PLEISTOCENE, PERHAPS 25,000 YEARS AGO 178
After the restoration modelled by J. H. McGregor.

PHOTOGRAPH SHOWING A NARROW PASSAGE IN THE CAVERN OF
FONT-DE-GAUME ON THE BEUNE 179
Reproduced by permission from Osborn's
_Men of the Old Stone Age_.

A MAMMOTH DRAWN ON THE WALL OF THE FONT-DE-GAUME CAVERN 179

A GRAZING BISON, DELICATELY AND CAREFULLY DRAWN, ENGRAVED
ON A WALL OF THE ALTAMIRA CAVE, NORTHERN SPAIN 179

PHOTOGRAPH OF A MEDIAN SECTION THROUGH THE SHELL OF THE
PEARLY NAUTILUS 186

PHOTOGRAPH OF THE ENTIRE SHELL OF THE PEARLY NAUTILUS 186

NAUTILUS 186

SHOEBILL 187
Photo: W. S. Berridge.

THE WALKING-FISH OR MUD-SKIPPER (_Periophthalmus_), COMMON
AT THE MOUTHS OF RIVERS IN TROPICAL AFRICA, ASIA, AND
NORTH-WEST AUSTRALIA 190

THE AUSTRALIAN MORE-PORK OR PODARGUS 190
Photo: _The Times_.

PELICAN'S BILL, ADAPTED FOR CATCHING AND STORING FISHES 191

SPOONBILL'S BILL, ADAPTED FOR SIFTING THE MUD AND CATCHING
THE SMALL ANIMALS, E.G. FISHES, CRUSTACEANS, INSECT
LARVAE, WHICH LIVE THERE 191

AVOCET'S BILL, ADAPTED FOR A CURIOUS SIDEWAYS SCOOPING IN
THE SHORE-POOLS AND CATCHING SMALL ANIMALS 191

HORNBILL'S BILL, ADAPTED FOR EXCAVATING A NEST IN A TREE,
AND ALSO FOR SEIZING AND BREAKING DIVERSE FORMS OF FOOD,
FROM MAMMALS TO TORTOISES, FROM ROOTS TO FRUITS 191

FALCON'S BILL, ADAPTED FOR SEIZING, KILLING, AND TEARING
SMALL MAMMALS AND BIRDS 191

PUFFIN'S BILL, ADAPTED FOR CATCHING SMALL FISHES NEAR THE
SURFACE OF THE SEA, AND FOR HOLDING THEM WHEN CAUGHT AND
CARRYING THEM TO THE NEST 191

LIFE-HISTORY OF A FROG 192

HIND-LEG OF WHIRLIGIG BEETLE WHICH HAS BECOME BEAUTIFULLY
MODIFIED FOR AQUAT