Progress in the Study of Daemonelix 



19 



Fi^. 11. — A supposed 

 transitional form from 

 Daemonelix Irregular 

 to Daemonelix Regu- 

 lar. Prom a sketch by 

 Dr. F. C. Kenyon. 



be seen that the Irregular Daemonelix 

 below ends in the Regular Daemonelix 

 above. Possibly this is a transitional 

 form. 



Their gross structure varies in no 

 important respect from the preceding 

 form save that the tubules, which are 

 rather minute below, seem to grow more 

 robust and distinct above. Their mi- 

 nute structure is identical with that of 

 preceding and succeeding forms. (Plate 

 v.. Figs. 6, 7, 8; Plate XVL, Fig. 5b.) 



DAEMONELIX PROPER. 



The culmination of the entire group is in the "Devil's 

 Corkscrew," or the fossil " Twisters '"' first seen and described. 



FiR. 12. 

 Fig. 13. 



Fig. 14. Fig. 15. Fig. 16. Fig. 17. Fig. 18, 



Fig. 19. 



Figs. 12 to 19 inclusive, Daemonelix Regular, upper beds. 



Pig. 12. — Daemonelix without axis or spiral or transverse trunk, 

 ending below in a simple enlargement. Pig. 13. — A similar form, end- 

 ing below in three enlargements. Pig. 14. — Typical form of Daemone- 

 lix with a free spiral and transverse trunk or rhizome. Pig. 15. — Typi- 

 cal Daemonelix with axis and trunk, showing seven coils and a " button." , 

 Pig. 16.— A free spiral with two trunks. Pig. 17.— A large Daemone- 

 lix with three trunks. Pig. 18.— Double Daemonelix. "Twin Screws." 

 (The one in front is large and right-handed ; the one in the rear but 

 half the size and left-handed.) Pig. 19.— A complex Daemonelix from 

 the topmost beds on Pine ridge, near Squaw Canyon. 



99 



