50 



lieceptnculites. They either overlook the work of Billiugs, who 

 demoustrated the sponge spicular character of Recepiaculiies or 

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

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

 on this genus, and adopt his terminology and conclusions. 



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

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



