Terms of Auxology. — Buckman mirf Bather. 43 
The ice-sheet was not only a rasp or plow for the erosion of 
the materials of the drift from the old preglacial land surface, 
but was also, as I believe, a mill in whose lower part these 
materials were mostly very thoroughly commingled. Thence 
the resulting grist was in large part deposited under the ice, 
but also an important amount was still enclosed within it, he- 
coming at last superglacial before its deposition, when the 
returning warm climate again uncovered the land. 
THE TERMS OF AUXOLOGY,* 
"Zoologischen Anzeiger,'.' pp. 420 and 429, Nov. 14 and 28, 1*92. 
By S. S. Buckman, F. G. 8. and F. A. Bather, M. A., F. G. S., London. 
Ontogenetic Stages. 
In a paper entitled "Values in Classification of the Stages 
of Growth and Decline, etc," J Prof. Alpheus Hyatt divided 
the life of the individual into some five or six stages, which 
he designated b} r certain definite terms. These stages can, 
he believes, be recognised throughout the animal kingdom ; 
indeed their value has already been proved for Cephalopoda 
by his own important papers, notably the "Genesis of the 
Arietidse," * for Pelecypoda by Dr. R. T. Jackson, § and for 
Brachiopoda by Dr. C. E. Beecher. || Few modern workers 
will deny the existence of some such stages, or the necessity 
for naming them. It is therefore unfortunate that the desig- 
nations 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 favor with European 
laborers in similar fields. Since, however. Hyatt's terms are 
gradually coming into general use in America, and since they 
have lately been brought forward in Britain by Prof. J. F. 
Blake,** some protest should now be raised. They who un- 
*Av£i], growth, and \6yoS. science. 
tProc. Boston Soc. Nat. Hist. Vol. XXIII, p. 390, March, 1888. 
^Smithsonian Contributions to Knowledge. No. 673,Washington,1889. 
§"The development of the Ovster, with remarks on allied genera.'' 
Proc. Boston Soc. Nat. Hist. Vol. XXIII, p. 531, March, 1888; and 
"Phylogeny of the Pelecypoda. Tbe Aviculida- and their Allies. - ' 
Mem. Boston Soc. Nat. Hist. Vol. IV, No. VIII. pp. 277-100, July, 1890. 
[ "Development of the Brachiopoda.*' Amer. Journ. Sci. Vol. XLI, p. 
342. April, 1891, and Vol. XLIV, p. 133. Aug. 1892. 
**"The Evolution and Classification of the Cephalopoda, etc.'' Proc. 
Geol. Assoc. Vol. XII, p. 275, London, April, 1892. 
