ACT. — AW,.] 



LAMELLIBRANCHIA TA. 



459 



Fig. 766.— Ac tinopter 

 boydi. Right valve. 



Actinodesma mbrectans, see Glyptodesma 



sub rectum. 

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



fit. 1, explanation of plate 17, fig. 6. 

 Ety. aktin, a ray ; Pteria, a genus.] 

 In the text published in 1884, pt. 1, p. 

 107, he wrote the word Actinopteria, 

 which indicates he derived the name 

 from the genus Pteria. Distinguished 

 from Pterinea by strong cardinal and 

 lateral teeth , and no striations on tbe liga- 

 mental area; right valve convex. The 

 first species mentioned on page 3, where 

 the genus is de- 

 fined, is A. de- 

 cussata, but the 

 first one men- 

 tioned on page 

 107 of the text 

 is A. eximia. 

 No type is des- 

 ignated, 

 auriculata, Hall, 

 1884, Pal. N.Y., vol. 5, pt. 1, p. 121, Che- 

 mung Gr. 

 boydi, Con rad , 



1842, (Avicula 

 boydi,) Jour. 

 Acad. Nat. Sci. 

 Phil., vol. 8. p. 

 237, and Pal. 

 N. Y., vol. 5, p. 

 113, Ham. Gr. 



decussata, Hall, 



1843, (Avicula ^ 

 t\ ppnssntn ) Fia.767.-Actinopteria 

 a e c u s s a t a , ; boydi. Left valve. 

 Geo. 4th Dist. 



N. Y., p. 203, and Pal. N. Y., vol. 5, p. 



Ill, Ham. Gr. 

 delta, Hall, 1883, Pal. N. Y., vol. 5, p. 121, 



Chemung Gr. 

 doris, Hall, 1884, Pal. N. Y., vol. 5, p. 109, 



Marcellus Shale, 

 epsilon, Hall, 1883, Pal. N. Y., vol. 5, pt. 



1, p. 122, Chemung Gr. 

 eta, Hall, 1884, Pal. N. Y., vol. 5. pt. 1, p. 



124, Chemung Gr. 

 eximia, Hall, 1883, Pal. N. Y., vol. 5, pt. 



1, p. 107, Up. Held. Gr. 

 iota, Hall, 1884, Pal. N. Y., vol. 5, pt. 1, 



p. 127, Chemung Gr. 

 kappa, Hall, 1884, Pal. N. Y., vol. 5, pt. 1, 



p. 128, Chemung Gr. 

 muricata, Hall, 1843, (Avicula muricata,) 



Geo. Sur. 4th Dist. N. Y.,p. 181, and Pal. 



N. Y., vol. 5, p. 108, Marcellus Shale, 

 perobliqua, Conrad, 1842, (Avicula pero- 



bliqua,) Jour. Acad. Nat. Sci. Phil., vol. 



8, p. 235, and Pal. N. Y., vol. 5, p. 116, 



Ham. Gr. 

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



pt. 1, p. 118, Chemung Gr. 

 pleuroptera, Conrad, 1842, (Avicula pleu- 



roptera,) Jour. Acad. Nat. Sci., vol. 8, 



p. 242, Ham. Gr. 

 pusilla, Hall, 1884, Pal. N. Y., vol. 5, pt. 



1, p. 117, Ham. Gr. 

 subdecussata, Hall, 1884, Pal. N. Y, vol. 



5, pt. 1, p. 110, Ham. Gr. 



tenuistriata, Hall, 1884, Pal. N. Y., vol. 5, 

 pt. 1, p. 120, Chemung Gr. 



theta, Hall, 1884, Pal. N. Y., vol. 5, pt. 1, 

 p. 125, Chemung Gr. 



zeta, Hall, 1883, Pal. N. Y., vol. 5, pt. 1, 

 p. 123, Chemung Gr. 

 Allorisma, King, 1844, Ann. Mag. Nat. Hist., 

 vol. 14, p. 315. [Ety. alios, variable ;ereisma, 

 support, expressive of the variable na- 

 ture of the cartilage support or fulcrum.] 

 Equivalve, inequilateral, elongate, thin ; 

 anterior side short ; posterior long and 

 gaping at the extremity; beaks ante- 

 rior, depressed; surface concentrically 

 ridged or undulated ; hinge edentulous ; 

 ligament external; dorsal margin in- 

 flected, forming, a lanceolate depression 

 along the cardinal border behind the 

 beaks; anterior adductor scar occupy- 

 ing a low position ; pallial line faintly 

 marked. Type A. sulcatum. 



altirostratum, see Sedgwickia altirostrata. 



andrewsi, Whitfield, 1882, Ann. N. Y. 

 Acad. Sci., vol. 2, p. 222, Kaskaskia Gr. 



antiquum, Swallow, 1863, Trans. St. Louis 

 Acad. Sci., vol. 2, p. 95, Kaskaskia Gr. 



capax, Newberry, 1861, Ives' Col. Ex. 

 Exped., p. 120, Coal Meas. 



clavatum, McChesney, 1860, New Pal. 

 Foss., p. 56, Kaskaskia Gr. 



cooperi, see Chsenomya cooperi. 



costatum, Meek & Worthen, 1869, Proc. 

 Acad. Nat. Sci. Phil., p. 171, and Geo. 

 Sur. 111., vol. 5, p. 585, Coal Meas. 



cuneatum, Swallow, 1858, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 210, Mid. Coal 

 Meas. 



curtum, Swallow, 1858, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 194, Permian Gr. 



elegans, King, as identified by Geinitz. 

 See A. geinitzi. 



elongatum, Morton, 1836, (Pholadomya 

 elongata,) Am, Jour. Sci. and Arts, vol. 

 29, p. 153, Coal Meas. 



elongatum, Worthen, see A. worthenanum. 



ensiforme, Swallow, 1860, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 656, Coal. Meas. 



geinitzi, Meek, 1867, Am. Jour. Sci., vol. 

 44, 2d ser., p. 170, and Geo. Sur. 111., 

 vol. 5, p. 586, Coal Meas. 



gilberti, White, 1879, Bull. U. S. Geo. 

 Sur., vol. 5, No. 2, p. 217, and Cont. to 

 Pal., No. 6, p. 137, Carboniferous. 



granosum, Shumard, 1858, (Leptodomus 

 granosus,) Trans. St. Louis Acad. Sci., 



. vol. 1, p. 207, and Pal. E. Neb. p. 220, 

 Coal Meas. 



hannibalense, see Grammysia hannibal- 

 ensis. 



hybridum, Meek & Worthen, 1865, (Chae- 

 nomya hybrida,) Proc. Acad. Nat. Sci. 

 Phil., p. 250, and Geo. Sur. 111., vol. 3, 

 p. 538, Keokuk Gr. 



illinoisense, Worthen, 1884, Bull. No. 2, 

 111. St. Mus. Nat. Hist., p. 11, and Geo. 

 Sur. 111., vol. 8, p. 132, Keokuk Gr. 



lanceolatum, Swallow, 1858, Trans. St. 

 Louis Acad. Sci., vol. 1, p. 194, Per- 

 mian Gr. 



