HO 



NEW YORK STATE MUSEUM 

 PLATE I 



15 2 3 



V R O © 



f;f 



Enterolasma cf. caliculus Hall (sp.) 



Page 24 



FIG. 



i The exterior, natural size 



Zaphrentis cf. racinensis Whitfield 



Page 23 



2, 3 Lateral and basal view of an internal cast of the calyx. Natu- 

 ral size 



Heliophyllum sp. indet. 



Page 28 



4 Internal cast of a specimen. Natural size 



5 Same, X2 ; to show the impressions of the denticulated carinae 



on the septa 



Syringopora infundibulum Whitfield 



Page 35 



6-9 Sections obtained on a polished surface, to show the spini- 

 form septa, funnel-shaped tabulae and transverse, hollow 

 connecting processes. X2 



