ATR.] 



BRACHIOPODA. 



335 



junia, Billings, 1866, Catal. Sil. Foss. I spiriferoides, Eaton, 1831, (Terebratula 



Antic., p. 46, Anticosti Gr. spiriferoides,) Am. Jour. Sci., vol. 21, p. 



lamellosa, Leveille, 1835, (Spirifer 



lamellosus,) Mem. Geol. Soc. France, 



vol. 2, p. 39, Waverly Gr. 

 lara, Billings, 1866, Catal. Sil. Foss. 



Antic., p. 47, Anticosti Gr. 

 maconensis, Swallow, 1860, (Spirigera 



maconensis,) Trans. St. Louis Acad. 



Sci. vol. 1, p. 651, Coal Meas. 

 maia, see Spirifera maia. 

 minima, Swallow, 1860, (Spirigera min- 



ima,) Trans. St. Louis Acad. Sci., FIG. 539. Athyris spiriferoides. Dorsal and ventral 



view. 



vol. 1, p. 649, Ham. Gr. 

 missouriensis, Swallow, 1860, (Spirigera 



missouriensis,) Trans. St. Louis Acad. 



Sci., vol. 1, p. 650, Coal Meas. 

 missouriensis, Winchell, 1865, (Spirigera 



missouriensis,) Proc. Acad. Nat. Sci., 



p. 117, Lithographic limestone. This 



name was preoccupied. 

 monticola, White, 1874, (Spirigera mon- 



ticola,) Rep. Invert. Foss., p. 16, and 



Geo. Sur. W. 100th Mer., vol. 4, p. 91, 



Subcarboniferous. 

 naviformis, Hall, 1843, (Atrypa navifor- 



mis,) Geo. 4th Dist. N. Y., p. 71, and 



Pal. N. Y., vol. 2, p. 76, Clinton Gr. 

 obmaxima, McChesney, 1860, Desc., New 



Pal. Foss., p. 80, and Geo. Sur. W. 100th 



Mer., vol. 4, p. 92, Waverly Gr. 

 obvia, McChesney, 1860, Pal. Foss, p. 81, 



Kaskaskia Gr. Not recognized. 

 ohioensis, Winchell, 1865, Proc. Acad. 



Nat. Sci., p. 118, Waverly Gr. 

 orbicularis, McChesney, 1860, New Pal. 



Foss., Coal Meas. Not recognized. 

 papilioniformis, McChesney, 1867, Trans. 



Chi. Acad. Sci., vol. 1, Kaskaskia Gr. 

 parvirostris, Meek and Worthen, 1860, 



Proc. Acad. Nat. Sci. Phil., p. 451, 



Keokuk Gr. Referred later to A. 



planosulcata. 

 pectinifera, Swallow, 1863, Trans. St. 



Louis Acad. Sci., vol. 2, p. 88, Keo- 



kuk Gr. 

 perinflata, McChesney, 1860, Desc. New 



Pal. Foss., p. 81, Keokuk Gr. Not 



recognized. 

 persinuata, Meek, 1877, U. S. Geo. Sur., 



40th parallel, p. 81, Carboniferous. 

 planosulcata, Phillips, 1836, Geo. York., 



vol. 2, p. 220, Keokuk Gr. 

 plattensis, Swallow, 1863, Trans. St. Louis 



Acad. Sci., vol. 2, p. 87, Up. Coal. Meas. 

 polita, Hall, 1843, (Atrypa polita,) Geo. 



4th Dist. N. Y., pi. 65, fig. 5, and Pal. 



N. Y., vol. 4, p. 293, Chemung Gr. 

 primtana, see Meristella prinstana. 

 prouti, Swallow, 1860, (Spirigera proutii,) 



Trans. St. Louis Acad. Sci., vol. 1, p. 



649, Kinderhook or Waverly Gr. 

 reflexa, Swallow, 1863, Trans. St. Louis 



Acad. Sci., vol. 2. p. 88, Warsaw Gr. 

 singletoni, Swallow, 1863, Trans. St. Louis 



Acad. Sci., vol. 2, p. 87, Low. Coal 



Meas. 

 solitaria, Billings, 1866, Catal. Sil. Foss. 



Antic., p. 48, Anticosti Gr. 



FIG. 540. 



137, and Pal. N. Y., vol. 4, p. 285, Cor- 

 nif. and Ham. Gr. 



squamosa, Worthen, 1884, 

 Bull. No. 2, 111. St. Mus. 

 Nat. Hist., p. 24, and Geo. 

 Sur. 111., vol. 8, p. 103, St. 

 Louis Gr. 



sublamellosa, Hall, 1858, 

 Geo. Rep. Iowa, p. 702, 

 Kaskaskia Gr. 



subquadrata, Hall, 1858, 

 Geo. Rep. Iowa, p. 703, 

 Kaskaskia Gr. 



subtilita, Hall, 1852, 

 bury's Exped. to Great 

 Salt Lake, p. 409, Coal 

 Meas. 



trinuclea, Hall, 1858, (Terebratula trinu- 

 clea,) Trans. Alb. Inst, vol. 4, p. 7, and 

 Geo. Sur. Iowa, p. 659, Warsaw Gr. 



tumida, Dalman, 1827, (Atrypa tumida.) 

 The fossil usually referred to this species 

 is Whitfieldia maria, which Davidson 

 regarded as a synonym for W. tumida. 



tumidula, Billings, 1866, Catal. Sil. Foss. 

 Antic., p. 47, Anticosti Gr. 



turgida, Shaler, 1865, Bulletin No. 4, M. C. 

 Z., Anticosti Gr. Not denned so as to 

 be recognized. 



ultravarica, McChesney, 1861, Desc. New 

 Pal. Foss., p. 79, Keokuk Gr. Not 

 recognized. 



umbonata, see Hindella umbonata. 



vittata, Hall, 1860, 13th Rep. N. Y. St. 

 Mus. Nat. Hist., p. 89, and Pal. N. Y., 

 vol. 4, p. 289, Cornif. and Ham. Grs. 

 ATRYPA, Dalman, 1827, Vet. Acad. Handl., 

 p. 102. [Ety. a, without ; trypa, a hole 

 or perforation. It was supposed the 

 shells had no foramen in the beak. The 

 name is erroneous.] Suborbicular, 

 transverse or elongated ; articulating by 

 teeth and sockets ; beak of the ventral 

 valve produced and incurved, the apex 

 truncated by a small, round perforation, 

 sometimes separated from the hinge- 

 line by a deltidium ; valve more or less 

 convex with or without a defined sinus ; 

 a strong tooth on each side at the base 

 of the broad fissure is somewhat bilobed 

 at the summit, with a crenulated groove 

 on the back ; from the base of the teeth 

 a curving ridge extends forward and 

 partially incloses a broad, muscular 



