140 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. [bill. 87. 



Acrotreta gemmula Mattliew. Middle Cainbrijin. 



Acrotietii goniiuula Matthew, Traus. Koyal Soc. Canada, X, 1894, j). 87, ])1. 16, 



fig. 2;— Trans. N. Y. Acad. 8ci., XIV, 1895, p. 12li, pi. 5, lig. o. 

 Loc. St. Martins, New Brunswick. 



Acrotreta j>ulielini jVIattlie\v = l)iscinopsis gulielmi. 



Acrotreta microscopica (Shuinard). Middle Cambrian. 



Discina microscopica Sbumard, American Jour. Sci., XXXII, 2d ser., 1861, p. 221. 

 loc. Occurs abundantly in Burnett and Llano counties, Texas. 



Acrotreta pyxidicula White=Acrotreta gemma. 

 Acrotreta subcouica Meek (nou Kutorga)= Acrotreta gemma. 

 Acrotreta (!) subsidua White =Acrothele subsidua. 

 uEgilops Hall. A genus of pelecypods. 



AMBOC(ELIA Hall. Genotype Orthis umbonata Conrad. 



AmboccBlia Hall, Thirteenth Rep. N. Y. State Cab. Nat. Hist., 1860, p. 71. figs. 

 1-3; p. 72, figs. 4-6. — Meek and Hayden, Pal. Upper Missouri. Smithsonian 

 Cont. to Knowl., 172, 1864, p. 20.— Hall, Pal. New Y'ork, IV, 1867, p. 258— 

 Davidson, Suppl. British Sil. Brach., Palipontographical Soc, 1882, p. 131. — 

 Nettelroth, Kentucky Fossil Shells, Mem. Kentucky Geol. Survey, 1889, p. 

 85.— Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 54 ;— Thirteenth 

 Ann. Rep. N. Y. State Geologist, 1895, p. 761. 



Ambocoelia fimbriata Claypole. Portage (Dev.). 



Amboccelia fimbriata Claypole, Proc. American Phil. Soc, XXI, 1883, p. 232. 

 Loc. Perry County, Pennsylvania. 



Amboccelia gemmula McChesney=Amboc<Elia jilanoconvexa. 



Ambocoelia gregaria Hall. Chemung (Dev.). 



Orthis uuguiculus Hall (non Phillips), Geol. New York; Rep. Fourth Diet., 1843, 

 p. 267, fig. 5. 



Amboccelia gregaria Hall, Thirteenth Rep. N. Y. State Cab. Nat. Hist., 1860, p. 

 81;— Fifteenth Rep. Ibidem, 1862, p. 186.— Williams, Bull. U. S. Geol. Sur- 

 vey, 8, 1884, p. 11. 



Amboccelia umbonata var. gregaria Hall, Pal. New York, IV, 1867, p. 261, pi. 44, 

 figs. 19-25. 



Loc. New York; Pennsylvania, and Virginia. 



Obs. See Martinia subumbona. 



Ambocoelia minuta White. Kinderliook (L. Carb.). 



Ambocttdia (Spiriferf) minuta White, Proc. Boston Soc. Nat. Hist., IX, 1862, 



p. 26. 

 Loc. Hamburg, Illinois, and Hannibal, Missouri. 



Amboccelia planoconvexa (Shumard). U])per Carboniferous. 



Spirifer planoconvexa Shumard, Geol. Rep. Missouri, 1855, p. 202. — Geinitz, Car- 

 bon u. Dyas in Nebraska, 1866, p. 42, pi. 3, figs. 10-18. 



Amboccelia gemmula McChesney, New Pal. Fossils, 1860, p. 41 ; — Ibidem, 1865, 

 pi. 1, fig. 3. 



Spirifer (Martinia) planoconvexa Meek and Hayden, Pal. Upper Missouri, Smith- 

 sonian Cont. to Knowl., 172, Pt. I, 1864, p. 20, figs. a-e. — Meek, Final Rep. 

 U. S. Geol. Survey Nebraska, 1872, p. 184, pi. 4, fig. 4; pi. 8, fig. 2. 



Martinia planoconvexa McChesney, Trans. Chicago Acad. Sci., 1, 1868, p. 34, pi. 1, 

 fig. 3. 



