130 The Arncrivau G(?(>lo(/!st. August, i89si 
Ursachen dor Doforinationeu und dor (rebirgsbildung. Ed. Rej^er, 
Leipzig, 1892. 
Ueber den gegenwilrtigen Standpunkt unserer Kentniss von dem 
vorlionimen Fossiler Glscialpttanzen, A. G. Nathorst. [Bihang Sveus. 
vet akadhandl. Bd 17. Vd in No. 5]. 
Die Nordamerikanischen Wusten, J. Walther, [V'erhand. Gesell. f. 
Erdkunde zu Berlin, xix, 1892, No. IJ. 
VT. Laboratories and Museums. 
Bui. Lab of Nat. Hist. State Univ. of Iowa, Vol. ii, No. 2, contains: 
Report on some fossils collected in the Northwest Territory, Canada, by 
Naturalists from the University of Iowa, S. Calvin; Two unique spirifers 
from the Devonian strata of Iowa, S. Calvin; A geological recounoiss- 
ance in Buchanan County, Iowa, S. Calvin; Notes on a collection of 
fossils from the Lower Magnesian limestone from northeastern Iowa, S. 
Calvin. 
OOEEESPOI^DElNrCE. 
Two or three years since, I concluded to find out, if I could, the char- 
acter of the termination of the column of the crinoid Heterocrinus sub- 
crassus, having a Lower Silurian slab showing about one hundred speci- 
mens of the calj'x, and columns in a great profusion, 
I selected a column attached to its calyx, and followed it by uncover- 
ing, until I WHS rewarded by discovering the column diverging into well 
defined roots:— length of column from cal} x \2% inches. 
At that time I believed that the genus Glyptocrinus were tioaters, and 
devoid of bases or roots. 
About eighteen months ago, something caused me to doubt that idea, 
and I commenced the investigation of the t-rmination of their columns, 
and now, after a great deal of work, and after many discouragements, 
I have been able to so far develop root3 on the terminations of the col- 
umns of Glyptocrinus neali, Glypt. dyeri, and Glypt. baeri. I have a 
specimen of each specie", s-howing the calyx, column, and roots intact, 
and one slab of Glypt. baeri having on its surface several specimens of 
that character. 
One character of the specimens surprised me: — the diversity in the 
length of the columns between calyx and roots in the specimens just 
mentioned. In Glypt. neali the length varies from two to four or five 
inche?, Glypt. baeri from one-half inch to six or eight, and in Glypt. 
dyeri from one to four or five inches. 
I have also found a specimen of Hetero(-rinus simplex, showing calyx, 
column, and inverted saucer-like base, attached to another column. 
For further information in regard to above, address, 
Dr. D. T. D. Dyciie. 
Lebanon, Ohio, July 22, 1892. 
