Suburban Geology of Richmond, Indiana. 



301 



ing to it a twisted appearance, as represented in the following 

 figure. 



The fistular passage is evidently the work of art ; 



the spiral channel is as unquestionably the work 



Fig. 13. 



of nature. 



appears 



opposite 



slender and sharp fragment of flint, fitted to a han- 

 dle ; for the interior shows that the operator was at 

 first unsuccessful in bringing about a union of the 

 opposite borings, and a piece of flint was found 

 broken off at the bottom of the tube, where it had 

 passed by the bore from the other extremity : this 

 cecum was afterwards plugged with a piece of bone, 

 and the calibre, differently directed, was made to 



inosculate with the contrary boring. 

 The surface of this ivory article has been smooth- 



by accidental attrition. Small 



poss 



tpot 



on several parts appear to be remains of the original 

 surface ; and in the volute, patches consisting of 

 several exceedingly thin films laid upon each other, 



i 



tm 



as 







v -i 



i* 





while myriads of strise scarcely perceptible to the 

 naked eye/wind spirally around, crossing the vo- 

 lute at right angles, dipping down into it and pass- 

 ing under the filmy crusts, and reappearing on the 



side. The interior of this bone is of a 

 te color, exhibiting in a favorable light concentric and 

 rather elliptical curvatures, possessing a beautiful pearly irides- 

 cence. At the ends lines are seen running parallel with the trans- 

 verse curvature of the volute, and crossed by radiating or parallel 

 lines imperceptible to the unassisted eye; it is heavy and exceed- 

 ingly hard, like the enamel of a tooth. 



opposite 

 pure wh 



f 



bly beyond the limits which I have prescribed to myself in the 



purpose 



ous fossils of less dubious ag 



and 



L XL 



Both 



a very brief manner, amounting to little 



an 



