368 C. L. Fenton — The Hackberry Stage of 



the formation the list has been so divided as to give one 

 list for the Owen sub-stage ; one for the Spirif er zone, and 

 one for the Striatula zone. In comparing these lists it 

 should be borne in mind that in the Spirifer zone the 

 brachiopods were very numerous, as were also the rugose 

 corals, while in the Owen these same forms were compar- 

 atively uncommon. Thus though we have several species 

 common to both, they were much more sparsely scattered 

 in the Owen than in the Spirifer. 



In several cases I have reduced species to varieties, 

 because these "species" so intergraded with other forms 

 that a true specific distinction was lacking. Of such are 

 Strombodes johanni multiradiatus, Strophonella reversa. 

 hybrida, and Atrypa reticularis hackberry ensis of this/ 

 list, 3 



I. — Fossil Species of the Owen sub-stage. 

 Plants 



"Fueoids" of at least two species, undetermined. 

 Animales 

 Coelenterata 



Cliona sp. undet. Large boring forms found in Stro- 



matoporella, Alveolites, Pachyphyllnm and Acervnlaria. 

 Anthozoa 



Heliophyllum n. sp. 



Heliophyllnm, two undetermined species. 



Chonopliyllum ellipticum H. & W. 



Chonophyllum sp. undet. 



Zaphrentis solida H. & W. 



Cystiphyllum mundulum H. & W. 



Charaetophylium nanum (H. & W.) 



Strombodes johanni (H. & W.) 



Strombodes johanni multiradiatus (H. & W.). 4 



Acervularia inequalis H. & W. 



Acervularia "inequalis" (n. sp.?). 



Acervularia n. sp. 5 



Pachyphyllum woodmani (White). 



Pachyphyllum woodmani (White) n. var. 



Pachyphyllum crassicostatum Webster. 



Pachyphyllum crassum Webster. 



3 In this list, the abbreviations n. var. and n. sp. have been nsed to 

 designate those species and varieties new and undescribed, or apparently 

 undescribed. 



4 Described as Smithia multiradiata (23d Annual Eeport, N. Y. State 

 Cabinet), and has later been referred to as Strombodes multiradiatus 

 (H. & W.). The distinction S. johanni (H. & W.) is not sufficient to war- 

 rant specific distinction, and I here consider 'multiradiatus' as a variety 

 of johanni. 



6 The typical Acervularia Zone species. 



