xvi PROBLEMS OF RELATIVE GROWTH 



FIG. PAGE 



40. Dimorphism and heterogony of the male forceps in 



earwigs (forficula) . . . . . -71 



(From Huxley, 1927s) 



41. Diagram of the possible origin of forceps-dimorphism 



in male earwigs . . ..... 73 



(From Huxley, 1931c) 



42. Differential effect of adverse conditions on 



forceps-length and body-length in male earwigs 75 

 (From Huxley, 1927s) 



43. Dimorphism and heterogony in the 3RD leg of the 



mite Analges ........ 77 



(From Jucci, 1924) 



44. Difference in growth-coefficients of various regions 



of the large claw of fiddler-crabs . . . 80 



45. Growth-gradients within the male chela of crabs 



(uca and maia) ....... 83 



46. Changes in proportion of parts during growth of the 



chela in prawns (palaemon) ..... 84 



(From Dean, unpublished) 



47. Growth-gradients in the antennae of Copepods . 86 



48. Growth-gradients and evolutionary change in the 



feet of Ungulates ...... 88 



(From D'Arcy Thompson, 1917) 



49. Reversed growth-gradient in the limbs of sheep . 89 



(From Huxley, 1931B) 



50. Change in form of growth-gradient with change of 



growth-rate in the large claw of hermit-crabs 

 (eupagurus) . . . . . . . .91 



(After Bush, 1930) 



51. Growth-gradients in pereiopods and chelae of prawns 



(Palaemon) ........ 92 



(From Tazelaar, unpublished) 



52. Growth-gradients in the abdomen of crabs (Pinno- 



theres AND TELMESSUS) ...... 93 



(From Huxley, 1931B) 



53. Female pea-crabs (Pinnotheres) of various sizes, 



showing changes in proportion of the abdomen 

 during growth ....... 94 



(From Atkins, 1926) 



54. Relative growth in the three planes of space in the 



crusher and nipper claws of lobsters ... 97 



55. Relative growth in length and breadth of the chela 



in females, males and parasitized males of upogebia 98 



56. Gradients in feather-growth in the fowl . . 101 



57. Growth-gradients and evolutionary change in fish 



(Diodon and Orthagoriscus) ..... 105 

 (From D'Arcy Thompson, 1917) 



58. Cartesian transformations of the carapace of 



various crabs . . . . . . .107 



(From D'Arcy Thompson, 1917) 



59. Reconstructions of evolutionary stages in the avian 



pelvis, by the method of Cartesian transformation 108 

 (From D'Arcy Thompson, 1917) 



