14 Erwin Hinckley Barbour 



were the active, growing portion — as one would expect — while 

 the part behind was more or less decomposed. (See plate IV., 

 Fisrs. 12 to 17. "l Can these frail forms which show neither exit 

 nor entrance, which have all ends capped and sealed, be bur- 

 rows ? 



Often individual cigars or fingers appear to be loosely 

 matted together, just as if there had been originally some or- 

 ganic connection, through fibres passing from one to the 

 other. Commonly they present a regular outline, a more or 

 less spiral form, and a smooth surface of closely tangled 

 fibres. In many instances we have found these "cigars" 

 growing out from the various parts of the Devil's Corkscrews. 

 Either they were an integral part of them or were fused with 

 them. (See Plate VIII., Figs. 1, 2.) One kind, possibly a dif- 

 ferent species or variety, has a decidedly corrugated surface, 

 and each corrugation which goes to make up the main trunk 

 seems, like the whorl of which it is a part, to be composed of 

 £bres surrounding a core of sand. It may be likened, perhaps, 

 to the component strands of a hemp rope, which consist of 

 twisted fibers as much as does the rope itself. (Plate IV., 

 Fig. 11.) This same effect is often noticed in the surface of 

 the great "fossil twisters" themselves. 



Still another variety presents itself, one whose surface may 

 be described as warty or nodose. (Plate IV. Figs. 7, 8, 9, 

 10.) Aside from these superficial variations, there are no 

 differences that the author can announce at present. 



Numerous figures of all these are substituted for verbal 

 description. 



Superficially they are characterized by the same fibrous mat 

 surrounding the same core of sand which has already been 

 mentioned in connection with other forms. Microscopically 

 they show precisely the same tissue which is common to the 

 entire Daemonelix series. (Plate IV., Figs. 18, 19; XVI., 

 Fig. 5«.) 



94 



