210 SYNOPSIS OF AMERICAN FOSSIL BKACHIOI'ODA. fniLL.s;. 



Derbya cymbula Hall aiul (Jhuke. Upper Carboniferous. 



Derbvii cymbula Hall aud Clarke, Pal. New York, VIII, Tt. I, 18'J1', p. 348. pi. 



IIB, ligs. 2, 3. 

 Loc. Near Kansas City, Missouri. 



Derbya kaskaskiaensis (McObe^ney). Kaskaskia (L. Carb.). 



drtliis kaskiiBkieiisls McCliesiioy. Descriptions \e%v Pal. Foss., IStiO, \\. 31. 

 Derbja kaskaskicusis Hall aud Clarke, I'al. New York, VllI, Pt. I, 1892, pi. 



IIB, fis. 6. 

 Loc. Kaskaskia, Chester, aud Critteudeu, Illinois. 



Derbya keokuk Hall. Kuobstoiie-Keokiik (L. Carb.). 



Ortliis creuistrla Y.nidell aud Sliuuiard, Cout. (Jeol. Kentucky, 1847, pp. 19, 21. 

 Ortbis keokuk Hall, Geol. .Survey Iowa, I, Pt. II, 1858, p. (MO, pi. 19, \\g. 5.— 



Keyes, (icol. Survey Missouri, V, 1895, ]>. 63. 

 Streptorhyncbus Iceokuk Hall, Second Auu. Kej). New York State Geol., 1883, pi. 



41, figs. 1-3. 

 Streptorhyncbus crenistria Walcott, Mou. U. S. Geol. Survey, VIII, 1884, p. 279, 



pi. 18, lig. 14. 

 Derbya keokuk Hall and Clarke. Pal. New York, VIII, Pt. I, 1892, p. 262, pi. 11, 



ligs. 1-3. 

 Loc. Keokuk, Iowa; Warsaw aud Nauvoo, Illinois; Now Providence, Indiana; 



Clark County, Missouri; Nevada. 



Derbya pratteni (McCliesney). Uliper Carboniferous. 



Ortbis pratteni McChesuey, Descriptions New Pal. Foss., I860, p. 33. 

 Loc. Cbarbonier, Missouri. 



Derbya robusta (Hall). Upper Carboniferous. 



Ortbis umbraculum? Owen (non Scblotb.), Geol. Survey Wisconsin, lown, Min- 

 nesota, 1852, pi. 5, lig. 11 (see specimens iu U. S. Nat. Mus., Cat. Invert. 

 Foss., 17945). 



Ortbis robusta Hall, Geol. Survey Iowa, I, Pt. IT, 1858, p. 713, pi. 28, tig. 5. 



Streptorbyucbus robusta Hall, Second Ann. Kep. New York State Geol., 1883, 

 pi. 40,' tigs. 12-17. 



Derbyia ro])usta Waagen, Pabcontologica Indicn, Scr. NIII, 1, 1884, p. 592. — Hall 

 and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 262, pi. 10, ligs. 12-17; pi. 

 IIB, rtgs. 7, 8. 



Loc. St. Clair County, Illinois. 



Derbya ruginosa Hall and Clarke. Keokuk (L. Carb.). 



Derbya ruginosa Hall aud Clarke, Pal. New York, VIII, Pt. I, 1892, p. 346, pi. 



IIA, tigs. 25-27. 

 Loc. New I'rovidence, Indiana. 



Dicellonius Hall = ()bo]ella. 

 Dicellomus crassa UalI = Obolella crassa. 

 Dicellonius polita lTal]=()bolella polita. 

 Dico'losia King = IMlobites. 

 Dicraniscus Meek=Trip]ecia. 

 Dicraniscus ortoni Meek=Triplecia oi'toni. 



DICTYONELLA llall. Genotype Khynchonella? reticulata Hall. 



Dictyonella Hall, Twentieth Kep. New York State Cab. Nat. Hist., 1867, p. 274. 



Eicbwaldia Hall, Ibidem, 1867, p]>. 274-277, with figs.— Dall, American Jour. 

 Conch., VI, 1870, p. 98.— Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, 

 p. 307;— Tbirteeutb Ann. Rep. New York State Geologist, 1895, p. 903. 



