LIST OF ILLUSTRATIONS xv 



FIG. PAGE 



28. MALE FIGURE REPRESENTED IN THE ACT OF DRAW- 



ING A BOW OR THROWING A SPEAR . . -53 



29. A PIECE OF MAMMOTH IVORY CARVED WITH SPIRALS 



AND SCROLLS FROM THE CAVE OF ARUDY (HAUTES 

 PYRENEES) ... . . . -54 



30. VESUVIUS AS IT APPEARED BEFORE THE ERUPTION OF 



AUGUST 24, A.D. 79 . . . -57 



31. FIVE SUCCESSIVE STAGES IN THE CHANGE OF FORM OF 



VESUVIUS (FROM PHILLIPS' "VESUVIUS," 1869) . 62 



32. THE UPPER-ARM BONE OR HUMERUS OF THE GREAT 



REPTILE (GIGANTOSAURUS) OF TENDAGOROO . 89 



THE GIGANTIC REPTILE DIPLODOCUS ON LAND . 91 



33. THE RUDIMENTARY GILL-PLUME OF A CRAYFISH FROM 



THAT PART OF THE BODY-WALL TO WHICH THE 

 FIRST PAIR OF JAW-LEGS (MAXILLIPEDES) is ARTICU- 

 LATED . . . . . . .123 



STRANGELY-SHAPED FISHES . '. . .130 



34. DIAGRAM OF ROTIFER VULGARIS THE COMMON 



WHEEL ANIMALCULE ONE HUNDRED AND TWENTY 

 TIMES AS LONG AS THE CREATURE ITSELF . .159 



35. THE ROTIFER PEDALION MIRUMS-EEK FROM THE 



RIGHT SIDE, MAGNIFIED 180 DIAMETERS . .161 



36. THE ROTIFER PEDALION MIRUM SEEN FROM THE 



VENTRAL SURFACE . . . . . 162 



37. THE ROTIFER NOTEUS QUADRICORNIS TO SHOW ITS 



CURIOUS FOUR-HORNED CARAPACE . . .163 



THE LARVAL OR YOUNG FORM OF CRUSTACEA KNOWN 



AS "THE NAUPLIUS" . . ' . .. .164 



37 (bis). THREE TUBE-BUILDING WHEEL ANIMACULES . 169 



YOUNG STAGES OF GROWTH OR VELIGER LARVAE OF 



MARINE SNAILS . .181 



