54 



CHOUTEAU CORALS 



differentiated reticulate structure ; some tab- 

 ulae may have been misinterpreted as dis- 

 sepiments, as typical tabulae were not recog- 

 nized. 



Occurrejice. — Localities 1, 9. 



Material. — Specimens studied, 2. Holo- 

 type was probably lost in the fire which 

 destroyed the Broadhead collection. Studied 

 topotypes. University of Missouri No. 1357, 

 University of Chicago No. 1265. A specimen 

 is listed in the collection of the Indiana 

 State Museum from the ''Chouteau group, 

 Sedalia, Mo." 



Remarks. — ^The specimen in the Indiana 

 State Museum may be the holotype. The 

 specimens examined by the writer are within 

 the size range (10-12 cm) given for the 

 holotype, but are probably better preserved. 



Keyes' statement (Keyes, 1894, p. 124) 

 that there is "some doubt as to the locality" 

 is puzzling in view of a clear statement by 

 White as to where Broadhead collected the 

 specimen; since that time at least two and 

 possibly three more specimens have been 

 collected. 



Family Favositidae Milne-Edwards and 

 Haime 



Genus Favosites Lamarck, 1816, emend. 

 Smith and Gullick, 1927 



Tabulate coral. Corallum compound. Corallites 

 contiguous and prismatic. Walls perforated by 

 pores. Septa absent or merely represented by rows 

 of spine-like processes. Tabulae complete and 



more or less horizontal. (Smith and Gullick, 



1927, p. 117.) 



Genotype. — Favosites gothlandicus La- 

 marck, 1816. 



Occurrence. — Silurian and Devonian of 

 many parts of the world; rarely Lower 

 Mississippian of America. 



Remarks. — Lang, Smith, and Thomas 

 (1940, p. 94) definitely consider Palaeo- 

 favosites Twenhofel, 1914, to be a junior 

 subjective synonym of Favosites. They ap- 

 parently believe that Calamopora Goldfuss, 

 1829, is a junior subjective synonym (idem, 

 p. 29) and state (idem, p. 28) that Bore- 

 aster Lambe, 1906, is a possible synonym. 



Favosites divergens White and Whitfield 



Plate 13, figure 4; Plate 17, figure 3 



Favosites, White and Whitfield, 1862, Boston Soc. 

 Nat. History Proc, vol. 8, p. 306. 



Fwvosites di<vergens Winchell, 1865, Acad. Nat. 



Sci. Philadelphia Proc, p. 112. 

 Favosites JVhitfieldi White, 1874, Prelim. Rept. 



Invertebrate Fossils, p. 15. From U. S. Geog. 



Geol. Survey W. 100th. Mer. 

 Favosites divergens, White, 1877, U. S. Geog. 



Survey W. 100th Mer. Rept., vol. 4, p. 79. 



Externals. — Corallum of holotype about 

 one-half of hemisphere, corallites diverging 

 rapidly near base, prostrate and budding 

 rapidly in the center of mass; corallites ir- 

 regularly polygonal, about 2.0 to 3.5 mm 

 in diameter; calyces deep. 



Transverse section. — Walls with thin 

 median line at plane of junction ; very few 

 mural pores observed. 



Longitudinal section. — Walls slightly 

 wavy; tabulae complete, strong, generally 

 convex, some flat or concave, sometimes 

 oblique, about 8 in 10 mm. 



Occurrence. — The bed from which the 

 holotype was collected was not specified by 

 the authors and the label has only the nota- 

 tion "Kinderhook group, Burlington, Iowa." 

 Coarsely crystalline weathered linjestone ad- 

 hering to the specimen, however, suggests 

 that it came from the Chouteau limestone. 

 White's specimen is from the lower Car- 

 boniferous at Ewells Spring, Arizona (hori- 

 zon unknown). 



Material. — Specimens studied, 1. Holo- 

 type and only known specimen from type 

 locality, American Museum of Natural His- 

 tory No. 6363/1 ; specimen mentioned by 

 White, not seen by the writer. United States 

 National Museum No. 8536. 



Remarks. — The occasional oblique tabu- 

 lae are unusual in Favosites but they are not 

 sufficiently steeply tilted to be typical of the 

 mural vesicles characteristic of Pleurodic- 

 tyum. 



Favosites.^ mancus Winchell 

 Plate 13, figure 6 



Favosites? mancus Winchell, 1865, Acad. Nat. 

 Sci. Philadelphia Proc, p. 112. 



Favosites? mancus White, 1877, U. S. Geog. Sur- 

 vey W. 100th Mer. Rept., vol. 4, p. 79. 



Externals. — Corallum very small, about 6 

 mm in diameter (reconstructed), hemi- 

 spherical; corallites polygonal, very small, 

 about 1 mm in diameter, prostrate around 

 edges of corallum; walls relatively thick; 

 basal epitheca thin, possibly wrinkled. 



Longitudinal section. — Walls increasing 

 rapidly in thickness away from basal epi- 



