EXPLANATION OF PLATE 3 



Figs. 1-3 Metriophyllum deminutivum Easton, n. sp. ; X 7.5 p. 31 



1, Longitudinal section ; holotype ; axial appearance results from slightly oblique section 

 through axially fused septa ; University of Cincinnati 24300. 



2, Tangential section ; paratype ; not alternating carinae in early region but progressive 

 apposition until yard-arm carinae occur in most advanced stage ; University of Cincin- 

 nati 24301. 



J, Transverse section, reversed, middle? ephebic stage; paratype; note small number of 

 septa, two places where carinae have been cut parallel with septa, and somewhat tri- 

 partite counter septal arrangement ; University of Cincinnati 24302. 



Figs. 4-6 Rotiphylluni hians Easton, n. sp p. 33 



4, Longitudinal section ; paratype ; X 5 ; note tabulae ; University of Cincinnati 24304. 



5, Transverse section, reversed, ephebic stage ; paratype ; X 5 ; note solid axial area, sparse 

 tabulae, short cardinal septum and tripartite counter system ; University of Cincinnati 

 24305. 



6, Transverse section, reversed, neanic stage ; holotype ; X 7.5 ; cardinal and counter septa, 

 in combination with others, form a median plate ; University of Cincinnati 24303. 



Figs. 7-10 Rotiphylluni calyailum (Miller) emend. Easton ; x5 p. 32 



7/Transverse section, late neanic stage ; holotype ; University of Cincinnati 3359. 



8, Longitudinal section ; paratype. 



9, Transverse section, late ephebic stage ; paratype ; solid central area, counter f ossula, and 

 cardinal fossula are characteristic. 



10, Transverse section, reversed, early ephebic stage ; paratype ; figs. 8, 9, 10 are University 

 of Cincinnati 24307. 



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