30 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Ambonychia bellistriata Hall. 



Ambonychia bellistriata Hall, Pal. New York, 1, 1847, p. 163, pi. 36, figa. 4a-d.— 

 Rogers, Geol. Pennsylvania, 2, pt. 2, 1858, p. 819, fig. 605.— Zittel, Handb. 

 Pal., 2, Munich, 1881, p. 35, fig. 42a. — Lesley, Geol. Surv. Pennsylvania, 

 Rep., P. 4, 1889, p. 22, fig.— Ulrich, Geol. Minnesota, 3, pt. 2, 1894, p. 492, 

 pi. 35, figs. 1 and 2.— Grabau and Shimer, N. A. Index Fossils, 1, 1909, p. 430, 

 fig. 561a, b. 



Posidonomya bellistriata Emmons, Amer. Geology, 1, pt. 2, 1855, p. 176, pi. 13, 

 • figs. 5, 6. 



Trenton: Middleville and Trenton Falls, New York; near Wykoff, Minnesota 

 (Prosser). 



Plesiotype.—CaL No. 46084, U.S.N.M. 



Ambonychia bellistriata Miller. See Byssonycliia vera. 



Ambonychia carinata Hall. See Byssonycliia carinata. 



Ambonychia (Megaptera) casei Meek and Worthen. See Opisthoptera casei. 



Ambonychia (Megaptera) casei? Meek. See Opisthoptera fissicosta. 



Ambonychia cincinnatiensis Miller and Faber. See Byssonycliia vera. 



Ambonychia costata James. See Anomalodonta costata. 



Ambonychia? ctirvata Raymond. 



Ambonychia? curvata Raymond, Amer. Jour. Sci., 20, 1905, p. 373. 

 Chazyan (Day Point, Crown Point): Chazy, Valconr and Sloop Islands, New 

 York. 



Ambonychia erecta Hall. See Olionychia erecta. 



Ambonychia excavata Miller. See Olionychia excavata. 



Ambonychia illinoissenisis Worthen. 



Ambonychia Illinoisensis Worthen, Geol. Surv. Illinois, 6, 1875, p. 495, pi. 23, 



figs. 4a-b. 

 Richmond (Maquoketa): Savannah County, Illinois. 



Ambonychia intermedia Meek and Worthen. See Byssonychia intermedia. 



Ambonychia jamesi Miller. See Allonychia jamesi. 



Ambonychia lamellosa of authors. See Olionychia lamellosa. 



Ambonychia maxima Safford. 



Ambonychia maxima Safford, Geol. Tennessee, 1869, p. 287 (not defined;. 

 Middle Nashville: Central Tennessee. 



Ambonychia mytiloides Hall. See Olionychia mytiloides. 



Ambonychia neglecta McChesney. See Amphicoplia neglecta. 



Ambonychia nitida Billings. See Mytilarca nitida. 



Ambonychia obesa Miller. See Byssonychia obesa. 



Ambonychla obtusa Hall. See Cyrtodonta obtusa. 



Ambonychia orbicularis (Emmons). 



Pterinea orbicularis Emmons, Nat. Hist. New York, Geol., 2, 1842, pp. 395, 397, 

 fig. 3.— Owen, Amer. Jour. Sci. and Arts, 47, 1844, pp. 368, 369, fig. 3. 



