ANTHOZOA—TETRACORALLA. 



59 



14. A. shumardi (E. & H.). Middle Siluric. 

 Subcylindrical with numerous subregular constrictions all cov- 

 ered by a thin epitheca. Fossula well developed. 



In the Niagara group of Michigan, Iowa, Kentucky, Tennessee, 

 etc. 



15. A. yandelli (E. & H.). (Fig. 85.) Middle Devonic. 

 Irregularly cylindrical, often bent, constrictions irregular ; tabulae 



more or less irregular. 



In the Onondaga limestone of Indiana, Kentucky, Michigan and 

 Canada. 



16. A. hamiltoniae Hall. (Fig. 86.) Middle Devonic. 

 Small, cylindrical, often abruptly bent and constricted. Strong 



distant septa reach about a third to the center, and stop abruptly. 

 Tabulae flat. 



Abundant in the Hamilton shales of New York. 



IV. AULACOPHYLLUM E. & H. 



Like ZapJirentis, but the septa on either side of the fossula con- 

 verging toward it. Ord.?-Dev. 



17. A. sulcatum d'Orbigny. (Fig. 87.) Middle Devonic. 



Fig. 87. Aulacophyllum sulcatum (Ind. Geol. Survey). 



