ANT. AVI.] 



LAMELLIBRANCHIA TA. 



463 



angulata, Dawson, 1860, (Naiadites angu- 

 latus,) Acadian Geology, p. 205, Coal 

 Meas. 



FIG. 779. Anthraco- 

 mya elougata. 



FIG. 778. Anomalodonta gigantea, external 

 surface. 



arenacea, Dawson, 1860, (Naiadites are- 

 naceus,) Acadian Geology, p. 205, Coal 

 Meas. 



carbonaria, Dawson, 1860, (Naiadites car- 

 bonarius,) Acadian Geology, p. 204, Coal 

 Meas. 



elongata, Dawson, 1860, (Naiadites elon- 

 gatus,) Acadian Ge- 

 ology, p. 20-1, Coal 

 Meas. 



Ifevis, Dawson, 1860, 

 (Naiadites laevis,) 

 Acadian Geology, 

 p. 204, Coal Meas. 

 o b t u s a , Dawson, 

 186Q, (Naiadites ob- 

 tusus, ) Acadian 

 Geology, p. 205, 

 Coal Meas. 

 ovalis, Dawson, 1860, (Naiadites ovalis,) 



Acadian Geology, p. 205, Coal Meas. 

 ANTHRACOPTERA, Salter, 1862, Mem. Geo. 

 Sur. Country Around Wigan, p. 37. 

 [Ety. anthrax, coal ; pteron, a wing.] 

 Shells small, aviculoid ; height greater 

 than width ; valves subequal, wing 

 short, hinge straight ; surface concen- 

 trically marked. 



carbonaria, see Anthracomya carbonaria. 

 (?) fragilis, Meek & Wortben, 1866, 

 Proc. Chi. Acad. Sci., p. 18, Keo- 

 kuk Gr. 



lievis, see Anthracomya Itevis. 

 polita, White, 1880, 12th Rep. U. S. 



Geo. Sur. Terr., p. 166, Coal Meas. 

 ANTHRACOSIA, King, 1844, Ann. and Mag. 

 Nat. Hist., p. 313. [Ety. anthrax, coal.] 

 Equi valve, inequilateral; tooth in each 

 valve below the umbo ; crown of tooth 

 of right valve excavated anteriorly 

 and ridged posteriorly ; crown of 

 tooth of left valve ridged anteriorly 

 and sloped posteriorly ; furrow in 

 hinge-plate, between umbone and tooth; 

 scars of anterior pedal muscles above 

 the anterior adductor impressions. 

 Type A. beanana. 



bradorica, Dawson, 1868, Acad. Geol., p. 



314, Carb. 

 Area, Linne, 1758. This 



genus is unknown in 



the Palaeozoic rocks. 

 carbonaria, Cox. See FIG. 780. Anthra- 



Macrodon carbona- cosia bradorica. 



rius. 

 cutpidata, Swallow, 1858, Trans. St. Louis 



Acad. Sci., vol. 1, p. 209, Up. Coal Meas. 



Founded on a cast. Genus unknown. 

 modesta, Winchell, 1863, Proc. Acad. 



Nat. Sci., p. 15, Marshall Gr. Not an 



Area. 

 striata, Schlotheim, as identified by Gein- 



itz, is Macrodon tenuistriatus. 

 punctifera, Dawson, 1868, Acad Geol., 



Carb. The name was preoccupied by 



Deshayes in his work, 1824-1836. 

 Astarte, Sowerby, 1818, Min. Conch., vol. 2, 



p. 85. Not a Palaeozoic genus. 

 mortonensis, see Edmondia mortonensis. 

 nebraskensis, see Edmondia nebraskensis. 

 subtextilis, see Euthydesma subtextile. 

 ASTARTELLA, Hall, 1858, Geo. Rep. Iowa, p. 



715. [Ety. diminutive of Astarte.'] 



Shell thick, smooth, or concentrically 



furrowed ; lunule impressed , ligament 



external; hinge teeth, two in each 



valve; anterior tooth in right valve 



large and strong, with a longitudinal 



pit in the summit. Type A. vera. 

 concentrica, McChesney, 1860, (Edmondia 



concentrica,) Descr. New Pal. Foss., p. 



55, Coal Meas. 

 gurleyi, White, 1878, Proc. Acad. Nat. Sci., 



p. 35, and Cont. to Pal., No. 8, p. 166, 



Coal Meas. 

 newberryi, Meek, 1875, Ohio Pal., vol. 2, 



p. 340, Coal Meas. 

 varica, McChesney, 1860, Descr. New Pal. 



)ss., p. 55, Coal Meas'. 



vera, Mall, 1858, Geo. Rep. Iowa, p. 715, 



Coal Meas. 



AVICULA, Klein, 1753, Ostrac. [Ety. avicula, 

 a little bird.] Very inequivalve, in- 

 equilateral, obliquely oval; hinge pro- 

 duced posteriorly into a flattened de- 

 fined wing; the inferior or right valve 

 flattened, notched for the passage of 

 the byssus; anterior muscular im- 

 pression very small and faintly marked ; 

 adductor large, superficial, a little be- 

 hind the middle; cartilage external, 

 linear, simple, placed on a narrow 

 marginal facet, extending from the 

 beak toward the cardinal angle ; hinge 

 edentulous, or with two small car- 

 dinal teeth beneath the beak in one 

 valve, and one in the other, and a 

 long, slender, posterior bifid lateral 

 tooth in each ; substance corneo-cal- 

 careous, lamellar without, pearly within. 

 Type A. hirundo. Not a Palaeozoic ge- 

 nus. Species are left here for want of 

 better material to determine their gen- 

 eric relations. 



acanthoptera, Hall, 1843, Geo. Rep. 4th 

 Dist. N. Y., p. 263, Chemung Gr. 



