1909 TERMINOLOGY vii 



Palingenesis, The repetition of phylogeny by 



ontogeny. 



The ontogenetic record is preserved excellently among Ammonites, 

 but its recapitulative fidelity is often marred. Irregularity of record 

 may, it is here suggested, be grouped as follows : — 



Palingenesis, 



saltative skipping of stages, 



cunctative delayed development, 



precedentive unequal acceleration. 



For further remarks, see later, pp. xiii, xiv. 



Homo- ~\ of the same ^ 



Hetero- > genetic of different >origin(s). 



Poly- J of many J 



-phyletic for -genetic = stock(s), for origin(s). 



o 



'equivalents heterophyletic species, which are 



similar. 

 prefigtiration indication of what an adolescent 



descendant will be. 

 ^representation indication of what an adult ancestor 



has been. 



Morphic equivalents may be homreomorphs, and they may be iso- 

 chronous, of the same date, or heterochronous, of different dates. 



Epacme the increasing ^ periods of 



Acme the maximum > faunal 



Paracme the decreasing j development. 



These terms may also be u.sed in regard to other phenomena of 

 rise, culmination, and decline. 



CURA TORI A L TERMS ' 



The nomenclature descriptive of the different types to be dealt 

 with is important. Sufficient perhaps will be : — 



Proterotypes — Primary types. 



Holotype the one, or chief >^ 



Syntype a partner ( fype- 



Parulype an assistant [" 



Lectolype a syntype selected as ^ 



I For other terms and literature see Schuchert & Buckman, Ann. Mag. 

 Nat. Hist. (7) xvi, 1905, 102, and Schuchert, Catal. of 'type Specimens; Bull. 

 U.S. Nat. Mus. 53 (1) 1905, g. 



