421 



»Genesis of the Arietidae«^, for Pelecijpoda by Dr. R. T. Jackson^, 

 and for Brachiopoda by Dr. C. E. Beech er ^. Few modern workers 

 will deny the existence of some such stages , or the necessity for nam- 

 ing them. It is therefore unfortunate that the designations proposed 

 by Prof. Hyatt are open to serious objection on etymological grounds : 

 this, no doubt, is largely the reason why they do not seem to have 

 found favour with European labourers in similar fields. Since, how- 

 ever, Hyatt's terms are gradually coming into general use in Ame- 

 rica , and since they have lately been brought forward in Britain by 

 Prof. J. F. Blake 6, some protest should now be raised. They who 

 undertake this ungrateful task are bound to set up something in place 

 of what they destroy ; a fresh series of terms is therefore proposed, but 

 in its construction the original has been altered no more than seemed 

 absolutely necessary. 



The following Table gives, in the first column, the terms now 

 applied by Hyatt to the successive ontogenetic stages; in the second 

 column, those Avhich it is here proposed to substitute; in the third 

 column the words that may be used in ordinary literature, when tech- 

 nical strictness is not considered necessary. Some may think that the 

 better known words of the third column , or their equivalents in the 

 various European languages, should suffice for the purpose ; but scien- 

 tific precision demands terms that do not already possess some more 

 general meaning, that can be transferred with ease into other tongues, 

 and that lend themselves to the formation of suitable compounds. 



Hyatt 



1. Embryologie 



2. Naepionic 



3. Nealogic 



4. Ephebolic 



5. Geratologic 



a) Clinologic 



b) Nostologic 



Here proposed 

 Embryonic 

 Brephic 

 Neanic 

 Ephebic 

 Gerontic 

 Catabatic 

 Hypostrophic 

 (Schluß folgt. 



Literary equivalents 



Embryonic 



Infantine or Larval 



Adolescent 



Adult or Mature 



Senile 



Declining 



Atavic 



3 Smithsonian Contributions to knowledge. No. 673, Washington, 1889. 



* »The development of the Oyster, with remarks on allied genera.« Proc. Bos- 

 ton Soc. Nat. Hist. Vol. XXHI. p. 531. March, 1888; and »Phylogeny of the Pele- 

 cypoda. The Aviculidae and their Allies«. Mem. Boston Soc. Nat. Hist. Vol. IV. 

 No. VIII. p. 277—400. July, 1890. 



5 »Development of the Brachiopoda.« Amer. Journ. Sci. Vol.XLI. Apr. 1891, 

 and Vol. XLIV. p. 133. Aug. 1892. 



6 »The Evolution and Classification of the Cephalopoda etc.« Proc. Geol. Assoc. 

 Vol. XII. p. 275. London, April, 1892. 



