128 J. L. Smith—Emerald-green Spodumene. 
to marine plants from which they have fallen, as they were 
decomposed, and have thus been amassed on the mud 
bottom. This species I propose to designate by the following 
name ; and illustrations of it will be given in the Paleontology 
of Ohio, vol. ii, 
SPIRORBIS ANTHRACOSIA, 0. sp. ; 
Shell minute, planorbiform, composed of from one to two 
and a half volutions, tube slender, and very gradually increas- 
ing in diameter, marked by very fine, irregular, encircling 
strie, which are often gathered into little knots or points near 
the border of the open umbilicus. Lower side of the shell more 
or less flattened as if for attachment to some ae substance. 
Diameter seldom exceeding one line, general] 
ormation and locality.—In the higher x ba = the Coal- 
measures, near Marietta, Ohio; associated with Anthracopupa 
Ohioensis. 
Art. XVI.—Hiddenite, an Emerald-green variety of Spodumene ; 
by J. LAWRENCE Smita, of Louisville, Ky. 
THE new variety of spodumene described in this paper 
was ieaseued about five years since on the Mr. 
within a few years so many ee minerals, including the 
samarskite. Shortly after its discovery some crystals came 
which he sent to Mr. N. Spang of Pittsburgh. einge 
he showed others of them to Mr. W. E. Hidden, a very enter- 
tion in regard to their mode of occurrence. The ¢ ee 
were first found very sparingly, and loose in the soil, but Mr. 
Hidden, having leased the locality and carried on a systematic 
exploration, has discovered the mineral im situ, and obtain 
many fine crystals. 
to the time when my attention was called to the mineral 
it was considered diopside, a reasonable conclusion considering 
the imperfect character of the crystals that had been found. 
A blowpipe test, and a determination of its specific gravity 
showed me that it was not diopside, but an unusual variety of 
spodumene. 
Mode of oceurrence.—In the absence of any drift formation 
in this region it is evident that all the minerals found here 
detached and loose in the soil—as most of them are—were 
