AMN. ANA.] 



LAMELLIBRANCHIA TA. 



4611 



planistriata, Hall, 1861, Geo. Rep. Wis., 

 p. 32, Trenton Gr. 



radiata, Hall, 1847, 

 Pal. N. Y., vol. 1, 

 p. 292, Trenton, 

 Hud. Riv. Grs., 

 and Mid. Sil. Prob- 

 ably a syn. for A. 

 carinata. 



rauchi, McChesney, 

 1860, New Pal. 

 Foss., p. 89, Hud. 

 Riv. Gr. Not rec- 

 FIG. 771. Ambonychia ognized. 



radiata. retrorsa, S. A. Miller, 



1878, Jour. Gin. 



Soc. Nat. Hist., vol. 1, p. 104, Hud. 

 Riv. Gr. 



robusta, S A. Miller, 1880, Jour. Cin. Soc. 

 Nat. Hist,, vol. 3, p. 315, Hud. Riv. Gr. 

 strisecosta, see Pterinea strisecosta. 

 superba, Billings, 1866, Catal. Sil. Foss. 



Antic., p. 50, Anticosti Gr. 

 swanana, Safford, 1869, Geo. of Tenn. Not 



defined. 



undata, Emmons, 1842, (Pterinea undata,) 

 Geo. Rep. N. Y., p. 395, and Pal. N. Y., 

 vol. 1, p. 165, Black Riv. and Trenton 

 Grs. Possibly belonging to an unde- 

 fined genus. 



large triangular cartilage pit beneath- 

 the beaks, and smaller pit just anterior.. 

 Type A. leidyi. 



FIG. 773. Amphiccelia costata. 



costata, Hall & Whitfield, 1875, Ohio Pal.,. 



vol. 2, p. 140, Niagara Gr. 

 leidyi, Hall, 1867, 20th Rep. N. Y. Mus. 



Nat. Hist,, p. 387, Niagara Gr. 



FIG. 772. Amnigenia catskillensis. 



AMNIGENIA, Hall, 1883, Pal. N. Y., vol. 5. 

 [Ety. amnis, a river ; gigno, to bear.] 

 Like Anodpnta in form and external 

 characters; anterior muscular impres- 

 sions large and prominent; posterior 

 ones large and shallow. Type A. cats- 

 killensis. 



catskillensis, Vanuxem, 1842, (Cypricar- 

 dites catskillensis,) Geo. Rep. 3d Dist. 

 N. Y., p. 186, and Pal. N. Y., vol. 5, p. 

 516, Catskill Gr. 



AMPHICCKLIA, Hall, 1868, 20th Rep. N. Y. 

 Mus. Nat. Hist., p. 386. [Ety. amphi, 

 both ; koilos, hollow.] Equivalve, ine- 

 quilateral, subrhomboidal ; umbones 

 gibbous; beaks elevated and incurved ; 

 external ligamental area flattened ; 



neglecta, McChesney, 1861, (Ambo- 

 cta,) 



and Geo. Sur. 111., vol. 3, p. 358, Niag- 

 ara Gr. 

 Amphidesma delnfieldi, Castelnau, 1843, Syst. 



iphidesma delnfieldi, 

 Sil., p. 44. Not r< 



nychia neglecta,) Pal. Foss., p. 88, 

 111., vol. 3, ] 



ii, Castelnau 

 j p. 44. JN ot recogn i zed . 

 Anatina, Lamarck, 1809, Phil. Zool."*[F,ty. 

 pertaining to the duck, or like the 

 duck's bill.] Oblong, ventricose, atten- 

 uated, and gaping posteriorly : umbones. 

 fissured ; spoon-shaped cardinal process 

 in each valve. Type A. rostrata. Not 

 a Palaeozoic genus. 



leda, Hall, 1860, 13th Rep. N. Y. Mus. 

 Nat. Hist., p. 110, Ham. Gr. Not prop- 

 erly defined. 

 sinuata, see Ilionia sinuata. 



