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



Delthyris rugatina Conrad^D. sulcata. 



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



Spirifera rujja'costa Hall, Canadian Nat. Gcol., V, 1860, p. 145. — Dawson, Acadian 



Geol., 3d ed., 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, fig. 79. 

 Spirifera sculptilis Billings, Geol. Canada, 1863, p. 386, fig. 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.. New York; Monroe County, Pennsylvania; Bosan- 



qnet, Ontario ; Falls of Ohio. 



Delthyris sinnatus 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 decemplicatns Hall, Geol. New York ; 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. 1-4. 



Loc. Europe; Lockport, Rochester, etc., New York; Hamilton, Ontario. 



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



Delthyris undnlatus Vanuxem=D. raricosta. 

 Delthyris varica Conrad =Bilobites varicus. 

 Delthyris ziczac Hall=D. consobrina. 



DERBYA Waageu. Genotype Derbya regularis Waagen. 



Derbyia Waagen, Pal?eontologica 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, p. 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. 



