CLINOPHYLLUM 



47 



Genus Clinophyllum Grove, 1935, 

 emend. Easton 



Small to medium sfze, curved conical 

 corals; calyx usually deep and steeply in- 

 clined ; epitheca thick ; septa thick, tapering ; 

 counter septum longest, cardinal septum 

 next longest ; alar septa shortest, small, lying 

 in alar pseudo-fossulae ; septa reaching center 

 in young but not later stages, pseudopin- 

 nately arranged ; tabulae sparse, complete, 

 rather strong, steeply inclined cardinally; 

 dissepiments lacking. 



Genotype. — Clinophyllum chouteauense 

 (Miller), 1891. 



Occurrence. — Chouteau limestone (un- 

 restricted) of Missouri ; shale beneath Rock- 

 ford limestone in Indiana. 



Remarks. — The above diagnosis is from 

 Grove (1935, pp. 364, 365) w^ith the modi- 

 fication that the calyx is not always steeply 

 inclined. 



Clinophyllum chouteauense (Miller) 



Plate 6, figures 1-3 ; Plate 16, figures 34-38 



Zaphrentis chouteauensis Miller, 1891, Indiana 



Dept. Gcol. Nat. Res. 17th Ann. Kept., p. 10, 



pi. 1, figs. 11, 12, Adv. Sheets. 

 Amplexus corniculum Miller, [in part], Indiana 



Dept. Geol. Nat. Res. 17th Ann. Rept., p. 



9, Adv. Sheets. 

 Zaphrentis chouteauensis, Miller, 1892, Indiana 



Dept. Geol. Nat. Res., 17th Ann. Rept., p. 



620, pi. 1, figs. 11, 12. 

 Amplexus corniculum, Miller, 1892, [in part], 



idem, p. 619. 

 Zaphrentis chouteauensis, Keyes, 1894, Missouri 



Geol. Survey, vol. 4, p. 112. 

 Zaphrentis chouteauensis, Moore, 1928, Missouri 



Bur. Geol. Mines, ser. 2. vol. 21, pp. 53, 97. 

 ^Zaphrentis sp. cf. Z. chouteauensis, Moore, 1928, 



Missouri Bur. Geol. Mines, ser. 2, vol. 21, 



p. 120. 

 Clinophyllum chouteaunse [sic]. Grove, 1935, Am. 



Midland Naturalist, vol. 16, p. 365. 

 C[linophyllum] chouteauensis. Grove, 1935, 



idem, p. 366. 



Externals. — Medium size, curved, cera- 

 toid, slightly flattened normal to counter- 

 cardinal plane; epitheca smooth to faintly 

 marked by interseptal ridges, not thick; 

 calyx steeply tilted proximally toward cardi- 

 nal septum; septa thick, extending upon 

 tabulae in floor; counter septum thickest 

 and longest, occupying fairly prominent 

 pseudo-fossula; alar septa may be slightly 

 shortened ; tabulae tilted approximately par- 

 allel with rim of calyx. 



Transverse sections. — Septa radially ar- 

 ranged in neanic stage, extending to center ; 

 tabulae possibly absent; cardinal fossula 

 weak, if present ; cardinal and counter septa 

 thicker than others. 



Septa in ephebic stage become unequally 

 thickened but fail to reach axis as calyx ex- 

 pands ; tabulae present. 



Longitudinal section. — Tabulae thick, 

 widely spaced, tabular density 11 or 12 per 

 cm. 



Occurrence. — Localities, 2, 7, 10, 11, 47, 

 53, 54. 



Material. — Specimens studied, 26. Holo- 

 type, University of Cincinnati No. 3916; 

 figured paratype. University of Cincinnati 

 No. 24308; unfigured paratype. University 

 of Cincinnati No. 3917; Grove's hypotypes, 

 University of Chicago Nos. 3158, 9679 ; ten- 

 tatively identified specimens, University of 

 Missouri Nos. 370, 1050, 1148; United 

 States National Museum not numbered. 



Remarks. — The specimen figured by Mil- 

 ler (1892, pi. 1, figs. 11, 12) is here desig- 

 nated the holotype. One of the original co- 

 types proves to be Amplexus corniculum. 



Clinophyllum excavatum Easton, n. sp. 

 Plate 6, figures 4-6; Plate 16, figure 39 



Amplexus corniculum Miller, 1891, [in part], In- 

 diana Dept. Geol. Nat. Res. 17th Ann. Rept., 

 p. 9, Adv. Sheets. 



Zaphrentis calyculus Miller, 1891, {in part], 

 idem, p. lO. 



Amplexus corniculum, Miller, 1892, [in part], 

 Indiana Dept. Geol. Nat. Res. 17th Ann. 

 Rept., p. 619. 



Zaphrentis calyculus, Miller, 1892, [in part], 

 idem, p. 620. 



Externals. — Curved ceratoid, rather rap- 

 idly expanding near calyx; calyx extremely 

 deep, slightly inclined ; epitheca smooth, ex- 

 cept for striae, occasionally rugae. 



Transverse sections. — In late ephebic 

 stage (diameters 1L6 by 9.6 mm), 21 pri- 

 mary septa, counter septum longest, two 

 probable alars next longest, remainder of 

 about equal length; tabulae sparse, de- 

 veloped only near periphery; epitheca ex- 

 tremely thick. 



In middle ephebic stage (diameters 10.1 

 by 9.4 mm) , number of septa not determined 

 because of fusion into extremely thick 

 epitheca; both the counter and cardinal 

 septa long, latter somewhat thicker. 



