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Ontogenic Table of Terms (II). 
Structural 
Conditions Stages Stages Substages Substages 
Embryonic Embryonic Several8 No popular 
Names. 
ler | ananepionic 
Anaplasis young Nepionic metanepionic 
(Haeckel) | paranepionic 
Immature or È ia 
Neanic metaneanic 
adolescent È 
paraneanie 
Metaplasis Mature or ON anephebie 
(Haeckel) adult phebie metephebic 
parephebic 
anagerontic 
Paraplasis Senile or old Gerontic metagerontic 
paragerontic 
The necessity of subdividing the embryonic stage is admitted and 
in all probability this really includes several stages with their respec- 
tive substages but the discussion of this problem must be left to the 
future. The former subdivision of the gerontie stage into two sub- 
stages seems to have met with general acceptance, but the terms re- 
main to be settled. Buckman and Bather have proposed Catabatic 
to replace my old term Clinologic, which is an improvement, but their 
term proposed, Hypostrophic, from Yrostpog meaning a turning around 
-and back, is not equally good. While this is better than the term 
formerly employed, »nostologic« it is longer and not preferable to 
»Nostic« from Nootdc? signifying a return in the sense of a journey 
8 These stages were enumerated and more or less described under the names 
of protembryo, mesembryo, metembryo, neoembryo, typembryo in my paper on »Va- 
lues in Classification of stages of Growth and Decline« and tothese Jackson added 
phylembryo in his »Phylogeny of the Pelecypoda«, p. 289. — See »Values of Classifi- 
cation of the Stages of Growth and Decline«. Am. Nat. Oct. 1888 and »Genesis of 
the Arietidae«, Smithsonian Contributions, No. 673, 1889, also Mem. Mus. Comp. 
Zoology, XVI, No. 3. 
9 Neither of these words have any authority for the termination »ic« but unless 
one can make some such »corruptions« it is often impracticable to manufacture a 
consistent set of terms according to the method here adopted. It is obvious that 
scientific convenience occasionally requires such heroie methods and this seems to 
be a case in which it is justifiable. 
If the new set of terms here proposed is adopted there will be no need of em- 
ploying either »catabatic« or »nostie«. These will then be superseded by »anageron- 
tie« and » paragerontic« or by all three terms used for the stages in the table if the 
characteristics justify their application. It was necessary, however, to discuss these 
terms because two distinet sets of names have been employed for the subdivision of 
the senile period. 
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