THE HAMILTON ASSOCIATION. 



87 







M 





No. 



NO. 4. 



4. — This plate gives a good idea of the spicular structure 



of the Astylo Spongia. The varied forms have all the same spicular 

 arrangement. As these forms are in the hands of Dr. Herman 

 Rauff, of Bonn, I will not presume to do more. 



NO. 5. 



No. 5 — This plate shows two forms oi Astylo Spongia Piaemassa, 

 both of which I found at Hamilton. 



