246 FF, A. Genth’s Contributions to Mineralogy. 
ecies above referred to; although this is true of another specimen in 
our collection, we su 086 it owite to the imperfect conservation of those 
composing the proboscis of the variety are arranged in parallel rows instead, 
of alternating with each other as they do in C. multibrachiatus. The 
arms of the variety come off as in the species, Haney the last radial 
piece which is axillary, supports two rays of arms, but the secondary 
mos 
instances throughout their whole length without bifurcations. This me 
rangement will ‘be easily understood by reference to plate 5,* fig. 5, 1, 
Position and locality. This crinoid occurs in the same beds as its con- 
gener described above. 
Art. XXX.— Contributions to Mineralogy; by FrepK. A. GENTH. 
1. Native Iron. 
AxovT four years ago I received for examination a mineral, 
ata was said to be found in the neighborhood of Kuoxville, 
in considerable quantities, and which was believed to 
e's a valuable nickel ore. A qualitative analysis of it, made at 
made it: ve i probable that it was real native tron. - ‘The speci- 
men, which 
and breaks pc’, into fragments of an irregular shape, W 
are crystalline, without, however, showing signs of any distinct 
planes. It is soft and scratches fluorspar with difficu us- 
tre eminently me Dissolves readily in nitric acid. It was 
found to contain : 
Tron, - - - - 99°790 
Nickel, with a trace of Cobalt, - = 2 ee AO 
M - = e = 0022 
Calcium, - - - ~ ss <<; W191 
Silicium, - - - - - - - 0075 
100148 
About a year after I had examined the mineral from Sox 
ville, I received the same substance from northern Alabama a3 _ 
an alloy of gold, platinum, silver, copper, etc., with the request 
to advise a plan for the separation of these metals. 
nt bon endeavored to obtain more of this interesting perry 
sree but the sie tel probably not being satis 
* To be given hereafter. 
eas 
. 
