﻿397 



which Haeckel's physiologic terms are placed side by side with 

 those proposed for the morphic phenomena. In following out the 

 same ideas the following table has been constructed, which differs 

 from theirs in the use of nepionic, as stated above, and also in the 

 use of phylanaplasis, phylometaplasis and phyloparaplasis as corre- 

 spondents of the similar ontogenetic terms : 



Summary, Table II. 



Ontogeny. Phylogeny. 



r Embryonic. i Phylernbryonic. -\ 



Anaplasis <. Nepionic. Phylanaplasis -< Phylonepionic. >Epacme. 



^Neanic. '-Phyloneanic. J 



Metaplasis JEphebic. Phylometaplasis | Phylephebic. lAcme. 



Paraplasis -J Gerontic. Phyloparaplasis -J Phylogerontic. > Paracme. 



Buckman and Bather gave the following appropriate example from 

 Beecher's and my own researches : 



"Thus we would say that the Productidae attained their paracme 

 in the Permian, when they were represented by the phylogerontic 

 Strophalosia and Aulosteges ; that the characters of the neanic and 

 ephebic stages of Coroniceras trigonatum are phylocatabatic ' ' (here 

 phylanagerontic). While granting the need of using this distinc- 

 tive prefix for the periods of evolution in the phylum one is likely 

 to become confused unless he fully understands the use of the word 

 " phjdum " as applicable to all grades of genetic series. Thus, in 

 ordinary acceptation of the term, a phylum may be the entire class 

 or any subdivision of it, even a single genus, provided the forms 

 can be shown to be genetically connected. It has been employed 

 in this way several times in this text after the names, species, genus, 

 family, etc., the ammonoidal phylum or ordinal phylum, phylum of 

 the Goniatitinse or subordinal phylum, family phylum, and even a 

 phylum of varieties and individuals. 



The Cycle. 



Phylum expresses genetic connection, cycle the totality of the 

 phenomena, whether morphic or physiologic, which are exhibited by 

 ontogeny or phylogeny. Thus, one can describe the cycle of the 

 phylum in its rise and decline, the epacme, acme and paracme as 

 purely dynamical phenomena exhibited by the increase in numbers 

 of forms, etc., or the cycle of the ontogeny as shown by the in- 



