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Transactions Kansas Academy of Science, Vol. XVII. PLATE III. 
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inch mount. The points are each protected by a long, sharp thorn of a darker 
color, inclined to black. 
Mr. Frank Patrick, of Topeka; suggested its being part of a fresh-water 
sponge spicule, which seems very probable, as it would explain its having sur- 
vived the action of boiling nitric acid, otherwise difficult to account for. In this 
view of the case, we may suppose that it formed the ends or caps to the cylin- 
drical pieces mentioned above, and part of the birotulate spicule of some species 
of Myenia. 
I was unable to get enough of it in focus at one time to make a satisfactory 
drawing of the right-hand side of the large Swrirella (fig. 1, pl. II), as every 
slight change of adjustment caused a different appearance of it. The alea, how- 
ever, seemed to be like those of S. tenera, and the contour is right. It is nearly 
of the same size at each end, and I was unable to find anything like the unusual 
wide lower third of it in any of my books of reference, and it is, possibly, a de- 
formity. It was finally decided to be a S. robusta of Ehrenberg. The Surirel- 
le and the Nitzschie (fig. 14, pl. II), were drawn at 425 to 1, as I did not have 
room for them larger. 
Not to make this too long and tedious, I will say that the collection of diatoms 
