208 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. [bull. 87. 



Delthyris rugatina Coura(l=D. sulcata. 



Delthyris('?) rugicosta (Hall). Arisaig (Sil.). 



Si)irit'er:i rngacosta Hall, Canadian Nat. CJeol., V, 1860, p. 145. — Dawson, Acadian 



Geol.,3(led., 1878, p. 596. 

 Loc. Arisaig, Nova Scotia. 



Delthyris sculptilis Hall. Hamilton (Dev.). 



Delthyris sculptilis Hall, Geol. New York; Rep. Fonrtli Dist., 1843, p. 202. 

 Spirifera sculptilis? Billings, Canadian Jour., VI, 1861, p. 262, lig, 79. 

 Spirifera sculptilis Billings, Geol. Canada, 1863, p. 386, lig. 423.— Hall, Pal. New 



York, IV, 1867, p. 221, pi. 35, figs. 10-14.— Nettelroth, Kentucky Fossil Shells, 



Mem. Kentucky Geol. Survey, 1889, p. 132, pi. 31, fig. 13. 

 Spirifer sculptilis Hall and Clarke, Pal. New York, VIII, Pt. II, 1895, pi. 37, 



fig. 8. 

 Loc. Ludlowville, York, etc.. Now York; Monroe County, Pennsylvania; Bosan- 



quet, Ontario ; Falls of Ohio. 



Delthyris sinuatus Hall=Bilobites bilobus. 

 Delthyris staminea Hall=Spirifer crispus. 



Delthyris sulcata Hisinger. Niagara (Sil.). 



Delthyris sulcata Hisinger, Petref. Suecica, 1837, p. 73, pi. 21, fig. 8. 



Delthyris rugatina Conrad, Jour. Acad. Nat. Sci. Philadelphia, VIII, 1842, p. 261. 



Delthyris decemplicatus Hall, Geol. New Y^ork ; Rep. Fourth Dist., 1843, p. 105, 

 fig. 4. 



Spirifer sulcatus Hall, American Jour. Sci., XX, 1849, p. 228; — Pal. New York, 

 II, 1852, p. 261, pi. 54, fig. 2.— Billings, Canadian Nat. Geol., I, 1856, p. 137, 

 pi. 2, fig. 7.— Hall, Second Ann. Rep. New York State Geol., 1883, pi. 60, 

 figs. 1-4.— Hall and Clarke, Pal. New York, VIII, Pt. II, 1895, pi. 35, figs. 1-i. 



Loc. Europe; Lockport, Rochester, etc., New Y''ork; Hamilton, Ontario. 



Ohs. Davidson regards this species as synonymous with D. elevata Dalman, 1828. 



Delthyris undulatus Vanuxem=D. raricosta. 

 Delthyris varica Conrad =Bilobites various. 

 Delthyris ziczac Hall=D. consobrina. 



DERBYA Waageu. Genotype Derbya regularis Waageu. 



Derbyia Waagen, Palseontologica Indica, Ser. XIII, I, 1884, pp. 576, 591. 

 Derbya Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 261 ;— Eleventh 

 Ann. Rep. New York State Geologist, 1894, j). 286. 



Derbya affinis Hall and Clarke. Upper Carboniferous. 



Derbya affinis Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 349, pi. IIB, 



figs. 4, 5, 

 Loc. Near Kansas City, Missouri. 



Derbya bennetti Hall and Clarke. Upper Carboniferous. 



Derbya bennetti Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, pp. 263,348, 



pi. IIA, figs. 34-39. 

 Loc. Near Kansas City, Missouri. 



Derbya biloba Hall. Upper Carboniferous. 



Streptorhynchus biloba Hall, Second Ann. Rep. New York State Geol., 1883, pi. 



41, figs. 4, 5. 

 Derbya biloba Hall and Clarke, Pal. New York, VIII, Pt. I, 1892, p. 350, pi. 11, 



figs. 4, 5. 

 Loc. Winterset, Iowa. 



