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



DELTHYRIS Daliuau. Genotype Deltbyris elevata Dalinan. 



Delthyris Dalman, Kongl. Svenska Vet.-Akad. Handl., filr 1827, 1828, pp. 93, 90.— 

 Dall. AuuTican ,Tonr. Conch., VI, 1870, p. 11(5.— Hall and Clarke, Pal. New 

 York, VIII, Pt. II, 1893, i>y>. 9 and ItJ under caption Seplati (iiou p. 19). 



Spirilera "lamellosa" Hall, Ninth Ann. Rep. New York State Geol., 1890, !>. 11. 



Ohs. Specimens of D. elevata examined by the writer show a distinct median 

 septum in the ventral valve. 



Deltliyris acaiithoptera Coiirad=Spirifer acanthopterus. 

 Deltbyris acanthota Hall=Spirifer disjunctus. 

 Delthyris acuminata Conrad =Spirifer acuminatus. 

 Deltbyris acuminata Hall (non Conrad) =D. mesicostalis. 

 Deltbyris acutilirata Conrad =Platystropbia acutilirata. 

 Delthyris arenaria Vanuxem = Spirifer arenosus. 

 Deltbyris areuosa Conrad=Spirifer arenosus. 

 Delthyris audacula Conrad=Spirifer audaculus. 

 Deltbyris bialveata Conrad =Spirifer radiatus. 

 Deltbyris biloba Conrad =Bilobites various. 

 Deltbyris bracliynota HaIl=Platystropbia biforata. 

 Deltbyris chemungensis Conrad =Spirifer disjunctus. 

 Deltbyris congesta Hall=Spirifer granulosus. 



Delthyris consobrina (d'Orbigny). Hamilton (Dev.). 



Delthyris ziczac Hall (non Eoemer), Geol. New York; Rep. Fourth Dist., 1813, 

 p. 200, fig. 5. 



Spirifera consobrina d'Orbigny, Prodrome Pal., I, 1850, p. 98. — Miller, N. Ameri- 

 can Geol. Pal., 1889, p. 372. 



Spirifer clio Hall, Thirteenth Rep. New York State Cab. Nat. Hist., 1860, p. 94. 



Spirifera ziczac Hall, Pal. New York, IV, 1867, p. 222, pi. 35, figs. 15-23;— Second 

 Ann. Rep. New York State Geol., 1883, pi. 59, fig. 9; pi. 60, fig. 18.— Whit- 

 field, Annals New York Acad. Sci., V, 1891, p. 554, pi. 11, fig, 13; — Geol. 

 Ohio, VII, 1895, p. 448, pi. 7, fig. 13. 



Spiriferina? ziczac Whitfield, Geol. Wisconsin, IV, 1882, p. 332, pi. 25, figs. 23, 24. 



Spirifer cousobrinns Hall and Clarke, Pal. New York, VIII, Pt. II, 1895, pi. 34, 

 figs. 9, 18; pi. 37, figs. 9, 10. 



Loc. Moscow, York, Darien, etc.,' New York; Columbus, Ohio; Milwaukee, Wis- 

 consin; Louisville, Kentucky. 



Deltbyris cuspidata Hall=Spirifer disjunctus. 

 Deltbyris decemplicatus Hall = D. sulcata. 

 Deltbyris disjuncta Han=Spirifer disjunctus. 

 Deltbyris duodenaria Hall = Spirifer duodenarius. 

 Deltbyris dui)licata Conrad = Spirifer duplicatus. 

 Deltbyris euruteines Owen=Si)irifer euruteines. 

 Deltbyris expansa Owen=Pterotbeca expansa, a Pteropod. 

 Deltbyris fimbriata Conrad =Eeticularia finibriata. 

 Deltbyris granulifera Hall = Spirifer granulosus. 

 Delthyris granulosa Conrad = Spirifer granulosus. 

 Deltbyris inermis Hall = Spirifer disjunctus. 

 Deltbyris Lrvis Hall=Reticularia Lvvis. 

 Deltbyris lynx Hall=Platystropbia lynx and biforata. 

 Delthyris macronota Hall = Spirifer macrouotus. 



