,*' 



206 Jacksonh Analysis of 



what are termed the egg-bearing organs, consequently, 

 if those are the females that are thus distinguished; 

 they prove much more numerous than the males- 



The tegument covering the body is soft and yielding, 

 the appearance of segments and articulations are necessa- 

 rily faint, indicating that little motion of the parts is re- 

 quired. 



They are to be found in considerable numbers in con- 

 nexion with the fuci, thrown up by the waves along 

 the shores of the islands, after being detached by the 

 motion of the large masses of ice, from the bottom of 

 the sea. 



Plate VII . 



Fig. 1. Superior view of the animal, natural size. 

 « 2. Inferior « " " de- 



prived of the legs near the coxae. 



ART. XIL— CHEMICAL ANALYSIS OF CHRYSOCOLLA 

 FROM THE HOLQUIN COPPER MINES, NEAR GIB. 

 ARA, CUBA. By C. T. Jacksotj, M. D. Read May 6, 1835. 



Mr. James Davis, Jr. presented me with several ores 

 of copper, from the mines recently explored in Cuba, for 

 chemical analysis- Among these ores I observed a beau- 

 tiful green ore, similar to the mineral described in works 

 on mineralogy as ChrysocoUa. It occurs in botryoidal 

 and mammillary incrustations in the cavities of Bronzite 

 or Diallage rock. Some of the incrustations are an inch 

 or more in thiclgiess, and when the minerd is broken, it 



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