1 r>4 The American Geologist, March, 1894 
Fig. 10. An arm of the type specimen above the second bifurcating 
plate, showing the short, strong pinula? from which the hard matrix has 
been cleaned away. The left free ray appears much shorter than the 
right but probably curves sharply inward. 
This species was described in the last November number of 
the Geologist, and is here again illustrated to show addi- 
tional features. 
We are well aware of the fact that pinuhe have not before 
been noticed in any of the genera and species of the Ichthj^o- 
crinidse ; if then what we have designated arms are really free 
rays, and the so-called pinuhe, arms, we have here an aberrant 
Onychocrinus or a new generic form. 
January 24, 1894. 
THE CHEMICAL COMPOSITION OF SOME OF THE 
WHITE LIMESTONES OF SUSSEX COUNTY, 
NEW JERSEY. 
By Frank L. Nason, New Brunswick, N. J. 
One of the strongest objections, to the writer's view, of the 
contemporaneous origin of the white crystalline limestone and 
the blue or •'magnesian limestones," has been the generally 
supposed fact that the white limestones are as a rule non- 
magnesian, while the blue limestones are magnesian. It is 
hardly necessary to state that the Taconic or Lower Cambrian 
fossils found in the blue limestones, called Calciferous or 
Magnesian by Dr. Cook, and in the sandstone called by the 
same author Potsdam (Geol. of N. J., 1868, p. 38), make this 
assumption much more admissible, by carrying the magnesian 
formation considerably downwards in the geological time 
scale. 
During the writer's engagement with the Lehigh Zinc and 
Iron Company, while prospecting on the extension of the 
franklinite deposit at Mine hill, at Franklin Furnace, many 
facts came to his notice which seem to have an important 
bearing on this question. The general shape of the outcrop 
of the franklinite bed is shown in fig. 1, as well as the loca- 
tion of some of the bore holes. Along the line a-b. fig. 1, 
twenty to twenty-five feet from the franklinite bed runs a 
