(^ *z*^*^ 



,i~0 . ■ 

 STRUCTURE AND CLASSIFICATION 



OF 



ZOOPHYTES. 



BY 



JAMES D. DANA, A.M., 



GEOLOGIST OF THE UNITED STATES EXPLORING EXPEDITION. 



DURING THE YEARS 



38, 1839, 1840, 1841, 1842. 



PHILADELPHIA: 



LEA AND BLANCHARD 



1846. 



