50 



Receptaculites. They either overlook the work of Billings, who 

 demonstrated the sponge spicular character of Receptaculites or 

 did not choose to follow him in his researches. We think there 

 is no reasonable doubt of the correctness of Billings' observations, 

 on this genus, and adopt his terminology and conclusions. 



The type of our species was found in the Galena Group, near 

 Dixon, Illinois, and is now in the collection of Win. F. E. Gurley. 



