Is The American Geologist. July, 1 
cumbrous qualifying phrases. We therefore suggest that, 
when it is desired to express stages of phylogeny, the syllable 
phyl- should be prefixed to the above terms, as shown in the 
annexed table. In this table we also give, in the first column, 
the physiological terms employed by Hseckel for growth, per- 
fection and decline in ontogeny; and. in the last column, the 
terms used by the same writer to denote corresponding periods 
in phylogeny. It should be noted that these latter terms are 
not morphological, but have reference chiefly to number of 
species and individuals, and partly also to size and predomi- 
nance. They have of late been used, it seems to us, wrongly, 
in a morphological sense, especially by American writers, 
probably for want of the very terms we now propose. Beecher, 
for instance, in his most interesting- essay on the development 
of Bilobites (= Orthis biloba and allies), speaks of certain 
forms as epacmic and others as paracmic, when it would 
probably be more in accordance with his meaning to call them 
phylobrephic and phylogerontic. Thus also we should say 
that the Productidae attained their paracme in the Permian, 
when they were represented by the phylogerontic Strophalo- 
sia and Aulosteges; that the characters of the neanic and 
ephebic stages of Coroniceras trigonatum are phylocatabatic ; 
or. to give one more instance, that the ephebic Cistella and 
Baculi'tes are phylhypostrophic. 
Ontogeny. Phylogeny. 
i Embryonic Phylembryonic , 
Anaplasis ■: Brephic Phylobrephic Epacme 
( Neanic Phyloneanic ' 
Metaplasis Ephebic Phylephebie Acme 
f Gerontic Phylogerontic , 
Cataplasis < Catabatic Phylocatabatic Paracme 
( Hypostrophic Phylhypostrophic ' 
The use of the term phylembryonic does not really clash 
with Jackson's term phylembryo; for the phylembryo of the 
individual represents the phylembryonic stage of the race; 
the essential morphological features of the two are the same. 
Stages of Individual Mokphogenesis. 
Yet another caution as to the use of the above terms seems 
required. As already pointed out, the various characters that 
go to the formation of an individual or a race, at any one 
