Geology and Mineralogy. 151 
That for the highest division the term Group be used; that 
the term for the next lower range of subdivisions be System ; 
be 1:500,000. It was proposed also that in the coloring of 
geological maps the colors which shall be used on the geological 
chart of Europe be those as nearly as possible that shall hereafter 
be generally adopted. Rose-carmine will have the preference for 
the crystalline schists unless shown to be of Cambrian or later 
age; violet for the Triassic, blue for the Jurassic, green for the 
Cretaceous, and yellow will be reserved for the Cenozoic group. 
€ notation in letters on the map will be based on the Latin 
alphabet; the letters used will be the initials (capital) of the name 
of the system; and an additional letter or numeral for subdivisions 
of the system, the numbering starting from the oldest included 
Subdivision. For eruptive rocks the same rule will be followed, 
ot that the Greek letter will be employed in place of the 
in. 
The directors of the International chart of Europe will meet at 
the extraordinary session of the Geological Society of France in 
1882, and that of the Helvetic Society of Natural Sciences in 
1883, in order to explain the condition of their work; and the 
quences—that, in future, priority for specific names shall not be 
irrevocably acquired unless the species shall have been not only 
described but also JSigured. 
he third meeting of the Congress will be held in Berlin in 1884. 
, Notice of the discovery of au Peecilopod in the Utica slate 
formation. —Through the courtesy of my friend, Rev. William 
4. Cleveland, of Holland Patent, Oneida County, New York, I 
- Jour. et Cheese Serres, Vou. XXII, No, 134.—Fesrvary, 1882. 
