522 The American Naturalist. [June, 
preserved in grasses.. Nor is the arrangement of cells that of 
hay, but it is instead that of soft parenchymatous tissue of sea- 
weeds or rootlets. 
As for the size and general 
appearance, I may explain 
here that these tubules are 
not unlike a tangle of root- 
lets in a flower pot. 
In a semi-arid region, such 
as this, plants are variously 
modified to withstand 
drought. Some send down 
roots to unusual depths, and 
it often happens that wells 
are entirely filled with great 
masses of fibrous rootlets 
especially of the cotton- 
wood. 
If we can conceive of the 
burrow being thus occupied - 
it would agree much better 
with its general structure 
than hay. It would repre- 
sent it still more closely if 
we conceive of a burrow, 
row, possibly abandoned, . 
and subsequently lined by 
Fig. 3.—A typical Daemonelix with axis. a felt of some imaginary 
From a photograpk of a specimen in the 3 ‘ ‘ 
‘Morrill Collection, State M University fucoid. However, in view 
of Nebraska. For measurements see Fig. 5. of all the facts, the foregoing 
seems untenable, and the author, although conceiving of 
the idea long ago, cannot believe this to be merely a 
vegetable lining toaburrow. Microscopic sections suggest the 
sea-weed, the structure being very simple. It is cellular but 
never vascular. It seems to me then that any attempt to show 
that these tubules are possibly hay, must miscarry. 
“Tf the spiral is a filled up burrow so is the axis also, and 
one must admit that apparently the animal, after it had dug 
