MINUTE STRUCTURE OF THE DAEMONELIX SERIES. 313 



possibly rootlets. Numerous reproductions of these micro-sections are 

 substituted for verbal descriptions (see plates 38 and 39). 



In longitudinal sections, average cells vary from 35 to 50 micromilli- 

 meters; in cross-section they measure about 10 micromillimeters. The 

 study of the great tubes of Daemonelix made possible by the recent 

 discovery of perfectly preserved specimens threatens to make radical if 

 not revolutionary change — removing Daemonelix altogether from the 

 dominion of the algae and exalting it to that of the dicotyledons. Though 

 unable to determine positively whether or not these great tubes are an 

 integral part or an accompaniment of Daemonelix, because their branch- 

 ings and ramifications cannot yet be traced to the surface fibers, yet if 

 they are such, then there is a strong presumption that they are higher 

 plants, in which all has rotted away save the persistent cortical layer 

 (see plate 39, figures 46, 47, 48). 



Apparently, then, it would follow that these tubes are roots of higher 

 plants ; hence the accompaniment rather than the cause of Daemonelix, 

 which would leave us where we were at first, with the spiral unaccounted 

 for. However, this must not be considered final, for close scrutiny has 

 shown no more connection between the great tubes and the encircling 

 mat of fibers than between the skeletons and their encasements of tubules. 

 Possibly the great tube is but that to and around which the original 

 Daemonelix fibers grew. 



The microscopic structure of cross and tangential sections is fairly 

 well represented in figures 46, 47, and 48. 



During the coming summer the author will again visit the region of 

 the anomalous Devil's corkscrews, hoping to add thereby link to link 

 until the chain of evidence is made complete. 



List of Papers. 



The following is a list of the papers published up to the present time 

 on this subject. The first seven are by the author of this article. 



Notice of new gigantic Fossils : Science, February 19, 1892, 3 figures. 



On a new order of gigantic Fossils : University Studies, The University of Nebraska, 

 vol. i, no. 4, July, 1892, 35 pp., 18 figures, 6 plates. 



Additional Notes on the new Fossil Daemonelix, its Mode of Occurrence, its gross 

 and minute Structure: University Studies, The University of Nebraska, vol. ii, 

 no. 1, July, 1894, 32 pp., 1 figure, 12 plates. 



Is Daemonelix a Burrow ? A reply to Dr Theodore Fuchs : The American Natu- 

 ralist, vol. xxix, June, 1895, 13 pp., 3 figures, 1 plate. 



Progress made in the Study of Daemonelix. [Abstract.] Nebraska Academy of 

 Science, publication no. v, 1894-'9o, 5 pp., 18 figures. 



XLVII— Bull. Geol. Soc. Am., Vol. 8, 1896 



