1 8 Erwin H. Barbour, 



Daimonelix anaxilis, gen. et sp. nov. 



The characteristics of this species are a plain helix without 

 axis, and, as far as observed, no transverse portion ; a greater 

 smoothness of surface and roundness of form than in either 

 circumaxilis or bispiralis ; a slenderness making it fragile 

 compared with the above robust species. All known indi- 



FlG. 14. — Daimonelix bispiralis, showing double spiral. Sketched from nature. 



viduals of this species seem to have exceedingly thin walls, 

 composed like all, of silicious tubes. As this specimen was 

 abandoned perforce for the time, owing to the drifting snow, 

 no better figure than that from sketches in the field can be 

 offered. See Fig. 15, and compare with Fig. 24, Plate IV., 



318 



