1340 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Zygospira(?) acutirostris Hall. 



Atrypa acutirostra Hall, Pal. New York, 1847, 1, p. 21, pi. 4 bis, fig. 6. Emmons 



Amer. Geology, 1, pt. 2, 1855, p. 192, pi. 3, fig. 27. 

 Rhynchonella acutirostris Hall, 12th Rep. New York State Cab. Nat. Hist., 1859, 



p. 65. 

 Zygospira(?) acutirostris Raymond, Ann. Carnegie Mus., 7, 1911, p. 227, pi. 34, 



figs. 15-22. 

 Chazyan (Day Point- Valcour): Valcour Island, Valcour, Chazy, and Crown Point, 



New York; Isle La Motte, Vermont. 



ZYGOSPIBA ANTICOSTIENSIS Davidson. See Catazyga anticostiensis. 

 ZYGOSPIRA AQUILA Sardeson. See Zygospira nicolleti. 



Zygospira cincinnatiensls Meek. 



Zygospira cincinnatiensis James, Cat. Foss. Cincinnati Group, 1890, p. 11 (nom. 

 nud.). Meek, Pal. Ohio, 1, 1873, p. 126, pi. 11, fig. 5. Miller, Cincinnati 

 Quart. Jour. Sci., 2, 1875, p. 59. Lesley, Geol. Surv. Pennsylvania, Rep. 

 P 4, 1890, p. 1282, 2 figs. Hall and Clarke, Pal. New York, 8, pt. 2, 1895, 

 pi. 54, figs. 13, 14. Cumings, 32d Ann. Rep. Dep. Geol. Nat. Res. Indiana, 

 1908, p. 945, pi. 36, figs. 9-9b. Foerste, Bull. Sci. Lab. Denison Univ., 16, 

 1910, p. 30, pi. 6, figs. 16a, b. 



Zygospira modesta var. cincinnatiensis Grabau and Shinier, N. A. Index Fossils, 

 1, 1907, p. 308. 



Maysville (Mount Hope and Fairmount): Cincinnati, Ohio; Vevay, Indiana; 

 north of Mason, Kentucky. 



Zygospira concentrica Ulrich. 



Zygospira concentrica Ulrich, Jour. Cincinnati Soc. Nat. Hist., 2, 1879, p. 14, pi. 



7, fig. 10. 

 Maysville (Fairmount): Cincinnati, Ohio, and vicinity. 



Zygospira deflecta (Hall). 



Atrypa deflecta Hall, Pal. New York, 1, 1847, p. 140, pi. 33, fig. 4. Emmons, 



Amer. Geology, 1, pt. 2, 1855, pi. 10, fig. 4. 



Zygospira deflecta Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 157. 

 Trenton: Lewis County, New York; Ottawa, Ontario. 



Zygospira? erratica (Hall). 



Orthis? erratica Hall, Pal. New York, 1, 1847, p. 288, pi. 79, fig. 5. 



Zygospira erratica, Davidson, Suppl. British Sil. Brach., Pal. Soc., 1882, p. 126. 



Catazyga erratica Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 158, pi. 54, 



figs. 17-23. Foerste, Bull. Sci. Lab. Denison Univ., 17, 1914, p. 266. 

 Orthonomsea erratica Hall and Clarke, 47th Rep. New York State Mus., 1894, p. 



1008. 

 Cincinnatian (Pulaski): Washington ville, Pulaski, etc., New York; various 



localities east of Ottawa, Ontario. 



Zygospira exigua (Hall). 



Atrypa exigua Hall, Pal. New York, 1, 1847, p. 141, pi. 33, fig. 6. Emmons, 



Amer. Geology, 1, pt. 2, 1855, p. 190, pi. 10, fig. 6. Lesley, Geol. Surv. 



Pennsylvania, Rep. P 4, 1889, p. 55, figs. 



Genus? exigua Hall, 12th Rep. New York State Cab. Nat. Hist., 1859, p. 66. 

 Protozyga exigua Hall and Clarke, Pal. New York, 8, pt. 2, 1893, p. 149, figs. 137, 



138; pi. 54, figs. 47, 48. 



Zygospira exigua Schuchert, Bull. U. S. Geol. Surv., 87, 1897, p. 463. 

 Trenton; Lowville, Watertown, and Martinsburg, New York. 



