40 



CHOUTEAU CORALS 



Zaplirentis diffordana, Worthen, 1890, Illinois 



Geol. Survey, vol. 8, p. 75, pi. 10, figs. 1-la 



(not lb). 

 fZaphrcntis diffordana, Whitfield, 1891, N. Y. 



Acad. Sci. Ann., vol. 5, p. 576, pi. 13, 



figs. 1-3. 

 fZaphrcntls diffordana, Whitfield, 1895, Ohio 



Geol. Survey, vol. 7, p. 465, pi. 9, figs. 1-3. 

 Zaplirentis diffordana, Grabau and Shimer, 1909, 



North American Index Fossils, vol. 1, p. 58. 

 Zaplirentis diffordana, Weller, 1909, Geol. Soc. 



America Bull., vol. 20, p. 272, pi. 10, figs. 



18-19. 

 Zaplirentis diffordana, Bassler, 1912, Proc. U. S. 



Nat. Mus., vol. 41, p. 219. 

 Triplopliyllum diffordana, Butts, 1922, Kentucky 



Geol. Survey, ser. 6, vol. VII, pp. 52, 55, 



58, 59, 71. 

 Triplopliyllum (Zaplirentis) diffordana. Butts, 



1922, Kentucky Geol. Survey, ser. 6, vol. 



VII, p. 53. 

 Triplohpyllum [sic] diffordana. Butts, 1922, 



Kentucky Geol. Survey, ser. 6, vol. VII, 



p. 56. 

 Zaplirentis (Triplopliyllum)? diffordana?. Butts, 



1926, Alabama Geol. Survey, Sp. Rept. 14, p. 



170, pi. 54, fig. 7. 

 Zaplirentis diffordana, Moore, 1928, Missouri 



Bur. Geol. Mines, ser. 2, vol. 21, pp. 63, 



97, 148, 163, 175, 177, 187, 195. 

 ?Zaplirentis diffordana, Laudon, 1931, Iowa 

 Geol. Survey, vol. 35, pp. 380, 393, 398-402, 



414, 427, 429 [in part]. 

 Zaplirentis ivortheni, Laudon, 1931, Iowa Geol. 



Survey, vol. 351, p. 427. 

 ? Triplopliyllum difforadanum. Grove, 1935, Am. 



Midland Naturalist vol. 16, p. 344; pi. 8, 



figs. 4, 5; pi. 11, figs. 13, 14, 16 (not 12, 15). 



Externals. — Small to medium size, sharp- 

 ly curved ceratoid, commonly carfnate near 

 apex at cardinal and counter positions ; 

 epitheca with encircling rugae, faint inter- 

 septal ridges and septal grooves; calyx 

 moderately deep, steep-v^^alled ; cardinal 

 fossula on concave side; minor septa in 

 most mature stages. 



Transverse sections. — In ephebic stage 

 (diameters 11.2 by 9.0 mm) are 30 much 

 dilated major septa, of which there are 9 

 on either side of counter septum in counter 

 quadrants; minor septa absent; cardinal 

 septum long; tabulae sparse; dissepiments 

 not observed. 



In very late ephebic stages, cardinal fos- 

 sula becomes more apparent by retreat of 

 cardinal septum. 



Occurrence. — Localities 14, 16, 30-38, 

 40-43, 53, 60, ?66, 67-69, 73, 88, 91-96, 

 107. The original material of Milne- 

 Edwards and Haime came from locality 21 

 (New Providence shale) and from Mam- 

 moth Cave and Grayson County, Kentucky. 



Material has been listed by Whitfield 

 (1891, 1895) from the Maxville limestone 

 at Maxville and Newtonville, Ohio. The 

 Maxville limestone and the beds near 

 Mammoth Cave and In Grayson County 

 are much younger than beds at locality 21, 

 hence, more than one species is probably 

 represented. The only undoubted speci- 

 mens seen by the writer are from localities 

 16 and 35. 



Material. — Grove's hypotypes, Univer- 

 sity of Chicago No. 4704, not studied; the 

 primary types are presumably in Paris, 

 France; the material used in this review is 

 State University of Iowa No. 9902. 



Remarks. — This species Is characterized 

 externally by the small curved, commonly 

 carinate corallites (3 or 4 cm high, calyx 

 1.5 to 2 cm in diameter) ; internally by the 

 rather straight thick major septa, persis- 

 tently long cardinal septum, and late inser- 

 tion of minor septa. 



The writer has been unable to find the 

 sections from which Grove made the figures 

 (Grove, 1935, pi. 11, figs. 13, 14, 16) 

 hence detailed study could not be made of 

 them, but the writer does not include the 

 other illustrated specimens (idem, pi. 11, 

 figs. 12, 15) in T. cliff ordanus. 



Triplophyllites EXiGUUS (Miller) 



Plate 10, figures 1-7 



Zaplirentis exigua Miller, 1891, Indiana Dept. 



Geol. Nat. Res. 17th Ann. Rept., p. 11, pi. 1, 



figs. 19, 20. Adv. Sheets. 

 Zaplirentis exigua, Miller, 1892, Indiana Dept. 



Geol. Nat. Res. 17th Ann. Rept., p. 621, 



pi. 1, figs. 19, 20. 

 fZaphrentis sp. Worthen, 1873, Illinois Geol. 



Survey, vol. 5, p. 278. 

 Zaplirentis diffordana?, Worthen, 1890, Illinois 



Geol. Survey, vol. 8, p. 75?, pi. 10, fig. lb 



(not 1, la). 

 Zaplirentis <voortlieni Weller, 1909, Geol. Soc. 



America. Bull, vol. 20, pp. 273, 274, pi. 



10, figs. 20, 21. 

 Zaplirentis (Triplopliyllum) nuortlieni, Butts, 



1922, Kentucky Geol. Survey, ser. 6, vol. 



VII, p. 71. 

 Zaplirentis nuortlieni, Moore, 1928, Missouri Bur. 



Geol. Mines, ser. 2, vol. 21, pp. 164, 195. 

 ?Zaplirentis sp. cf. Z. ivortlieni, Moore, 1928, 



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



p. 97. 

 Non Zaplirentis northern, 1931, Laudon, Iowa 



Geol. Survey, vol. 35, p. 427. 

 Triplopliyllum ivelleri Grove, 1935, Am. Mid- 

 land Naturalist, vol. 16, no. 3, p. 347, pi. 8, 



fig. 9; pi. 13, figs. 21-25. 



