320 
PROCEEDINGS OF SECTION C. 
(2.) The carry of the erratics and the grooving of the pavements 
prove that the ice travelled from south to north. 
(3.) The Glacial Beds are capped by marine sandy limestones of 
Miocene age, the junction line being an eroded one. The glaciation 
was therefore Pre-Miocene. 
(4.) The glaciation of Hal left’s Cove may perhaps be correlated 
with that of Bacchus Marsh and of Derrinal, in Victoria, and with 
that of the Inman Valley, near Port Victor, South Austral!^. It 
may, however, be referable to any geological age intermediate between 
that of the beginning of the Miocene and the close of the Palaeozoic. 
If the comparatively fresh appearance of the Glacial Beds and their 
approximate horizontality be any criterion, it is highly improbable 
that they are older than late Palaeozoic. 
3.— ABBREVIATED NAMES FOR CERTAIN CRYSTAL FORMS. 
By A. LIVERSIDGE , 31. A., F.R.S., Professor of Chemistry , University of Sydney r 
N.S. W. 
When the names of crystals have to be used constantly, as in 
lecturing upon or speaking about crystals and minerals, the waste of 
time involved by the present sesquipedalian names is a very serious 
matter, and it appears to me that it is desirable to shorten them some- 
what. I therefore venture to propose the following curtailed names 
for certain crystals to be used ordinarily, although not always, in place 
of the descriptive terms now in use. 
The third column shows the number of letters saved in each case. 
In every instance sufficient of the roots of the full name have been 
retained to indicate the source and meaning of the proposed abbreviated 
terms. 
Name. 
Abbreviated Name. 
Saving of Letters. 
Octahedron 
Octron 
4 
Hexahedron 
Hexron 
4 
Rhombic dodecahedron ... 
Rhododecron 
8 
Triakis octahedron 
Trioctron ... 
8 
Icosi tetrahedron 
Icolreton or Icositetron 
7 or 5 
Tetrakishexahedron 
Tetrahexron 
rj 
Hexakisoctahedron 
Hexakisron or Hexuctron 
7 or 8 
Tetrahedron 
Tetron 
< 
Trigonal-dodecahedron 
Tridodecron 
9 
Deltoid-dodecahedron 
Deldodecron 
8 
Hexakistetrahedron 
Hexatetron 
8 
Pentagonal-dodecahedron 
Pentron or Pentadodecron 
15 or 9 
Traprzohedron 
Trapezron 
4 
Tetragonal Pyramid 
Tetramid 
9 
Ditetragonal Pyramid 
Ditetramid... 
9 
Tetragonal Prism 
Tetri sm 
8 
Ditetragonal Prism 
Ditetrism ... 
8 
Sphenoid 
Sphenoid 
0 
Scalenohedron 
Scalenron 
4 
Hexagonal Pyramid 
Hexamid 
9 
Dihexagonal Pyramid 
Dihexamid 
9 
Hexagonal Prism 
Hexism 
8 
Dihexagonal Prism 
Dihexism 
8 
Rhombohedron 
Rhombron 
4 
