6o4 



REGENERATION AND GROWTH 



TABLE 7 



TOTAL TIME FOR REGENERATION: REPRESENTATIVE EXAMPLES 



Example 



Type of regener- 

 ation 



Time 



Reference 



Coleps (Ciliata) 

 Stentor (Ciliata) 



Ephydatia (Porifera) 

 Tubularia (Coelenterata) 

 Hydra (Coelenterata) 

 A'hiemiopsis (Ctenophora) 

 Planarians 



(Turbellaria) 

 Maricolan Turbellaria 



Lineus (Nemer tinea) 

 Lumbricidus, Tubifex 



Triops [Apiis), Oniscus I 

 Asellus, Leander \ 



Large decapod 



Crustacea 

 Octopus, Nassa (MoUusca) 



paratoniic 

 epimorphic and 

 morphallactic 

 reconstitution 

 morphallactic 



epimorphic 



epimorphic and 



morphallactic 



epimorphic and 



morphallactic 



epimorphic 



epimorphic 



epimorphic 

 epimorphic 

 epimorphic 



Asteroid Echinodermata epimorphic 



Clavelina (Tunicata) 

 Larval urodeles 

 Adult urodeles 

 Mammalian cornea 

 ,, skin 



liver 



(see p. 589) 



epimorphic 



epimorphic 



epimorphic 



epimorphic 



compensatory 



hypertrophy 



epimorphic 



20-25 mins 

 24 hours 



7 days 

 2-3 days 

 4-6 days 

 8-1 1 days 

 7-9 days 



Korschelt, 1927, p. 30 

 Korschelt, 1927, p. 22 



Brien, 1937 

 Moore, 19 10 

 Mattes, 1925 

 Coonfield, 1936 

 Lender, 1952, 1954 



20-35 days Liis, 1926; Lloyd, 1914 



27-30 days 

 2 1 -40 days 



16-28 days 



I 

 up to 2 years 



20-28 days 



90-180 days 



12 days 

 14-23 days 

 up to 1 00 days 

 -T-5 days 

 up to 75 days 

 4-21 days 



Coe, 1929 



Stone, 1932; Turner, 



1934; Stephan-Dubois, 



1952 



Przibram, 1909, p. 113; 



Ost, 1906; Auct.; 



Paulain, 1938 



Przibram, 1909, p. 113 



Lange, 1920; Hanko, 



1914 

 I King, 1898; Richters, 

 ' 191 2; Shapiro, 1914 



Berrill and Cohen, 1936 



various authors 



various authors 



various authors 



various authors 



various authors 



100-200 days various authors 



The first differential, i.e. the slope, of the curve of mean regeneration-rate rela- 

 tive to amount removed gives a measure of specific regeneration rate, i.e. rate per 

 unit of tissue removed. This is maximal at the point of inflection of the original 

 curve, which usually corresponds to the amputation of rather a small fraction. 

 Consequently graphs of specific regeneration rate, relative to amount removed, 

 for instance the "index of cicatrisation" of Du Notiy (1936), decline virtually 

 throughout the range of the amount amputated. Anderson (1933) recorded no 

 point of inflection in his curve of initial absolute rate, against amount removed 

 from the carapace of Daphnia, probably because he did not study regeneration 

 after very small losses. The curve of specific regeneration-rate derived from his 

 results would resemble that of Du Noiiy, likewise dealing with areas. 



Du Noiiy's index was found to be constant throughout a particular act of regen- 

 eration so that the instantaneous rate of regeneration at a point where an amount 



