60 



CHOUTEAU CORALS 



original cotypes are University of Cincin- 

 nati No. 24314. 



Remarks. — This species has definite dia- 

 phragms, termed tabulae by Smyth. The 

 writer prefers the yv^ord diaphragms be- 

 cause the structures occur within tubules 

 rather than extend across the floors of the 

 coral lites, and they are commonly vertically 

 arranged. 



The species differs from Squameophyllum 

 spiunans Smith in having diaphragms, in 

 possibly lacking scales, in being more dis- 

 coid, and in having stronger walls. 



The writer here designates the specimen 

 mentioned by Winchell (1863, p. 3) hav- 

 ing a diameter of 1.27 inches as the holo- 

 type of the species. It was not the principal 

 specimen described by Winchell, but sub- 

 sequent usage has made it a better type 

 for this than the other two specimens. 



Leptopora gorbyi Miller was proposed be- 

 cause Miller recognized that the original 

 description of L. typa did not fit the com- 

 mon Chouteau species. The writer has 

 studied Miller's types and finds them to be 

 conspecific with L. typa as herein revised. 

 Lang, Smith, and Thomas (1940, p. 76) 

 err in stating that White (1883, pi. 34, 

 figs. 12a, 12b) figured the genoholotype of 

 Leptopora. 



Cleistopora sp. 



Plate 16, figure 5 



Leptopora typa Winchell, 1863, [in part], Acad. 

 Nat. Sci., Philadelphia Proc, p. 3. 



Two of the cotypes of Leptopora typa 

 differ from the selected holotype of that 

 species in that the corallites are 3.5 to 4.0 

 mm in diameter with very definite but thin 

 walls and with the floors of coUarites pro- 

 portionately more domed than in C. typa. 

 The coralla are about 1.5 mm thick and 

 one nearly complete specimen is 18 mm in 

 diameter. The specimens seem to be quite 

 similar to Leptopora winchelli White. 



One of the specimens is a cast in vugular 

 cherty sandstone and the other is a chal- 

 cedony replacement. Internal structure was 

 not observed. 



Occurrence. — Locality 27. 



Material. — Specimens studied, 2. Univer- 

 sity of Michigan No. 2078. 



Appendix to the Cleistoporidae 

 Genus MiCROCYATHUS Hinde, 1896 



MicrocyatJius Hinde, 1896, Geol. Soc. London 

 Quart. Jour., vol. 52, pt. 3, p. 447. 



MicrocyatJius, Robinson, 1917, Connecticut Acad. 

 Arts Sci. Trans., vol. 21, p. 166. 



MicrocyatJius, Williams, 1943, U. S. Geol. Sur- 

 vey, Prof. Paper 203, p. 59. 



Diagnosis. — Coralla compound, attached 

 to some foreign body; calyces open and 

 nearly vertically walled, with septa possibly 

 represented by rows of crowded tubercles 

 or blunt spines; outer surface with dis- 

 continuous sinuous ridges and occasional 

 apertures; solid calcareous tissue fills bot- 

 tom and lines walls of calyces ; openly 

 porous reticulate tissue covers outer sur- 

 face of coralla. 



Genotype. — Hydnoporaf cyclostoma 

 Phillips. 



Occurrence. — Lower Mississippian (Kin- 

 derhook) of United States; Lower Car- 

 boniferous (Visean D3) of England and 

 Scotland. 



MiCROCYATHUS ENORMis (Meek and 

 Worthen) 



Plate 16, figure 18 



SpJienopoterium enorme Meek and Worthen, 1860, 



Acad. Nat. Sci. Philadelphia Proc, p. 448. 

 SpJienopoterium enorme, Meek and Worthen, 



1861, Am. Jour. Sci., ser. 2, vol. 32, p. 169. 

 SpJienopoterium enorme, Meek and Worthen, 



1861, idem, p. 175. 

 SpJienopoterium enorme, Meek and Worthen, 



1866, Illinois Geol. Survey, vol. II, p. 146, 



pi. 14, figs, la, b. 

 Palaeacis cyclostoma, Etheridge and Nicholson, 



1878, Annals Mag, Nat. History, ser. 5, vol. 



1, p. 221. 

 Palaeacis enormis, Keyes, 1894, Missouri Geol. 



Survey, vol. 4, p. 118. 

 Palaeacis enormis, Keyes and Rowley, 1897, Iowa 



Acad. Sci. Proc, vol. 4, p. 29. 

 Palaeacis enormis, Weller, 1898, U. S. Geol. Sur- 

 vey, Bull. 153, p. 404. 

 SpJienopoterium enorme. Kindle, 1899, Bull. Am. 



Paleontology, vol. 3, bull. 12, pp. 140, 219. 

 Palaeacis enormis, Kindle, 1899, idem. p. 162. 



Palaeacis enormis, Rowley, 1908, Missouri Bur, 

 Geology Mines, 2nd ser. vol. 8, p. 64, pi. 

 16, figs. 22-28. 



MicrocyatJius enormis, Robinson, 1917, Connecti- 

 cut Acad. Arts Sci. Trans., vol. 21, p. 167. 



MicrocyatJius enormis, Williams, 1943, U. S. 

 Geol. Survey, Prof. Paper 203, p. 59, pi. 6, 

 figs. 9-13. 



