PLATE 10 



Nepheliospongia typica Clarice 

 Fig. 



1 Lateral view of an elongate cup 



2 A smaller specimen 



3 The aperture of the same, showing the incurvature and thick- 



ness of wall 

 Lowest beds of the Chemung formation. Deyo basin, Naples 



N. Y. 



Nepheliospongia avocensis Clarke 



{See plate 11) 

 Fig. 



4 Specimen with somewhat undulated surface, showing the 



character of the reticulum 

 Chemung beds at Cotton hill, near Avoca N. Y. 



