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



Acrotreta gemmula Matthew. Middle Canibriaii. 



Acrotreta geminiila Matthew, Traua. Koyal Soc. Canada, X, 1«91, ]). 87, pi. 16, 



fig. i> ;— Trana. N. Y. Acad. Sci., XIV, 1895, p. 126, pi. 5, fig. 5. 

 Loc. St. Martins, New Hninswick. 



Acrotreta j;ulieln»i Matthew ^Discinopsis gulielrai. ^ 



Acrotreta microscopica (Shumard). Middle Cambriau. 



Discina microacopiLa Shumard, American .lonr. Sci., XXXII, 2d ser., 1861, p. 221. 

 Loc. Occurs abundantly in Burnett and Llano counties, Texaa. 



Acrotreta pyxidicula White=Acrotreta gemma. 



Acrotreta subconica Meek (non Kutorga) = Acrotreta gemma. 



Acrotreta (?) subsidua White=Acrothele subsidua. 



yEgilops Hall. A genus of pelecypods. 



AMBOCCELIA Hall. Genotype Orthis umbonata Conrad. 



Amboccelia 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 York, IV, 1867, p. 258— 

 Davidson, Suppl. British Sil. Brach., Paheontographical 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 f4eo]ogist, 1895, p. 761. 



Amboccelia fimbriata Claypole. Portage (Dev.). 



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

 Loc. Perry County, Pennsylvania. 



Amboccelia gemmula McChesney= Amboccelia planoconvexa. 



Amboccelia gregaria Hall. Chemung (Dev.). 



Urtliis uuguirulus Hall (non Phillips), Geol. New York; Pep. Fourth Dist., 1843, 

 p. 267, iig. 5. 



Ambocadia gregaria Hall, Thirteent;"! Rep. N. Y. State Cab. Nat. Hist., 1860, p. 

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

 vey, 3, 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. 



Amboccelia minuta White. Kinderhook (L. Carb.). 



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



p. 26. 

 Loc. Hamburg, Illinois, and Hannibal, Missouri. 



Amboccelia planoconvexa (Shumard). Upi)er Carboniferous. 



Spiriier planoconvexa Shumard, Geol. Rep. Missouri, 1855, p. 202. — (Jeinitz, 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, Trana. Chicago Acad. Sci., 1, 1868, p. 34, pi. 1, 

 fig. 3. 



