ORNIS 100
After Marsh.

SIX STAGES IN THE EVOLUTION OF THE HORSE, SHOWING GRADUAL
INCREASE IN SIZE 101
After Lull and Matthew.

DIAGRAM SHOWING SEVEN STAGES IN THE EVOLUTION OF THE
FORE-LIMBS AND HIND-LIMBS OF THE ANCESTORS OF THE MODERN
HORSE, BEGINNING WITH THE EARLIEST KNOWN PREDECESSORS OF
THE HORSE AND CULMINATING WITH THE HORSE OF TO-DAY 104
After Marsh and Lull.

WHAT IS MEANT BY HOMOLOGY? ESSENTIAL SIMILARITY OF
ARCHITECTURE, THOUGH THE APPEARANCES MAY BE VERY
DIFFERENT 105

AN EIGHT-ARMED CUTTLEFISH OR OCTOPUS ATTACKING A SMALL CRAB 116

A COMMON STARFISH, WHICH HAS LOST THREE ARMS AND IS
REGROWING THEM 116
After Professor W. C. McIntosh.

THE PAPER NAUTILUS (ARGONAUTA), AN ANIMAL OF THE OPEN SEA 117
Photo: J. J. Ward, F.E.S.

A PHOTOGRAPH SHOWING A STARFISH (_Asterias Forreri_) WHICH
HAS CAPTURED A LARGE FISH 117

TEN-ARMED CUTTLEFISH OR SQUID IN THE ACT OF CAPTURING A FISH 118

GREENLAND WHALE 118

MINUTE TRANSPARENT EARLY STAGE OF A SEA-CUCUMBER 119

AN INTRICATE COLONY OF OPEN-SEA ANIMALS (_Physophora
Hydrostatica_) RELATED TO THE PORTUGUESE MAN-OF-WAR 119
Photo: British Museum (Natural History).

A SCENE IN THE GREAT DEPTHS 119

SEA-HORSE IN SARGASSO WEED 120

LARGE MARINE LAMPREYS (_Petromyzon Marinus_) 120

THE DEEP-SEA FISH _Chiasmodon Niger_ 120

DEEP-SEA FISHES 120

FLINTY SKELETON OF VENUS' FLOWER BASKET (_Euplectella_), A
JAPANESE DEEP-SEA SPONGE 121

EGG DEPOSITORY OF _Semotilus Atromaculatus_ 121

THE BITTERLING (_Rhodeus Amarus_) 124

WOOLLY OPOSSUM CARRYING HER FAMILY 124
Photo: W. S. Berridge.

SURINAM TOAD (_Pipa Americana_) WITH YOUNG ONES HATCHING
OUT OF LITTLE POCKETS ON HER BACK 125

STORM PETREL OR MOTHER CAREY'S CHICKEN (_Procellaria
Pelagica_) 125

ALBATROSS: