AUL,.] 



BRACHIOPODA. 



337 



FIG. 542. Atrypa reticularis. 

 Interior of ventral valve; a, 

 impression of adductor mus- 

 cle; e, cardinal muscle; p, 

 pedicle muscle; o, ovarian 

 sinus; d, deltidlum. 



neglecta, see Rhynchonella neglecta. 



nitida, see Meristina nitida. 



nitida var. oblata, see Meristina nitida var. 



oblata. 

 nodostriata, Hall, 1852, Pal. N. Y., vol. 2, 



p. 272, Niagara Gr. 

 nucleolata, Hall, 1852, Pal. N. Y., vol. 2, 



p. 328, Coralline limestone. 

 nucleus, see Triplesia nucleus. 

 nustella, Castelnau, 1843, Syst. Sil., p. 39. 



Not recognized. 



oblata, Hall, 1852, Pal. N. Y., vol. 2, p. 9, 

 Medina Gr. 



o b t u s iplicata, 

 see Rhyn- 

 chonella ob- 

 tusiplicata. 

 octocostata, see 

 Pentame- 

 rella arata. 

 peculiaris, see I 

 Eatonia pe- | 

 culiaris. 

 phoca, Salter, 

 1852,(Rhyn- 

 chonella 

 phoca,) 

 S u t h e r- 

 land's Jour., 

 vol. 2, p. 

 ccxxvi, De- 

 vonian. 



planoconvexa, see Leptocoelia planoconvexa. 

 plebeia, Conrad, 1843, Geo. Rep. 3d Dist, 



N. Y., Ham. Gr. Preoccupied name. 

 pleiopleura, see Rhynchonella pleiopleura. 

 plena, see Rhynchonella plena. 

 plicata, see Rhynchonella plicata. 

 plicatella, (?) Linnseus, as identified by 

 Hall, in Pal. N. Y., vol. 2, p. 279. May 

 be stricken from the list as an erroneous 

 identification. 



plicatula, see Rhynchonella plicatula. 

 plicifera, see Rhynchonella plicifera, 

 polita, see Athyris polita. 

 prisca, syn. for Atrypa reticularis. 

 pseudomarginalis, Hall, 1860, 13th Rep. 

 N. Y. St. Mus. Nat. Hist., p. 84, and 

 Pal. N. Y., vol. 4, p. 327, Up. Held. Gr. 

 quadricostata, see Leiorhyncbus quadri- 



costatum. 



quadr icostata, -'* 



Hall, 1852, 

 see Rhyncho- 

 nella quadri- 

 costata. 



rect iplicata, 

 Conrad, 1842, 

 Jour. Acad. 

 Nat. Sci., vol. 

 8, p. 265, Low. 

 Held. Gr. 

 r e c urvirostra, 



rppnrvirnet FlG - 543. Atrypa reticnlaris- 

 recurvirostra. Interlor of dorsal valve> 



reticularis, Lm- showing spirals; p, hinge 

 nreus, 1767, plate. 

 (Anomia reticularis,) Syst. Nat., ed. 12, 

 p. 1132, and Pal. N. Y., vol. 2, p. 72. It 



occurs, with its varieties, in all the 

 Groups of the Upper Silurian and 

 Devonian formations, except the Oris- 

 kany sandstone. Some of its varieties 

 or synonyms are, Atrypa affinis, A. lenti- 

 formis, A. prisca, A. tribulis, Hippari- 

 onyx consimilis, etc. 



robusta, see Rhynchonella robusta. 



rostrata, see Meristella rostrata. 



rugosa, see Rhynchonella rugosa. 



scjiula, see Meristella scitula. 



emiplicata, see Rhynchonella semiplicata. 



singularis, see Eatonia singularis. 



sordida, see Rhynchonella sordida. 



spinosa, Hall, 1843, Geo. 4th Dist. N. Y., 

 p. 200, Cornif., Ham., Tully, and Che- 

 mung Grs. Equal to Atrypa aspera var. 

 occidentalis. 



subcuboides, D'Orbigny, see Rhynchonella 

 venustula. 



subtrigonalis, see Rhynchonella subtrig- 

 onalis. 



sulcata, see Merista sulcata. 



tenuilineata, Hall, 1843, Geo. 4th Dist. 

 N. Y., p. 272, Chemung Gr. 



tribulis, syn. for Atrypa reticularis. 



tumida, see Athyris tumida. 



unguiformis, syn. for Orthis proximus. 



unisulcata, see Meristella unisculcata. 

 AULOSTEGES, Helmerson, 1847, Bull, de la 

 Classe Physi. Math. Acad. Sci. St. Pe- 

 tersburg, vol. 6, p. 135. [Ety. aulos, 

 tube; stege, chamber.] Shell subpen- 

 tagonal ; ventral valve most convex, 



FIG. 541 Aulosteges wangenheimi. h, Triangu- 

 lar hinge area; d, convex pseudodeltidium ; 

 j, cardinal process ; a, adductor impression. 



beak produced, twisted, area triangular, 

 interrupted by a pseudodeltidium not 

 reaching the hinge-line, which is 

 straight and toothless; dorsal valve 

 convex at the umbo, depressed or con- 

 cave laterally; cardinal edge more or 

 less developed; surface of valves with 

 short tubular spires; in the interior of 

 the dorsal valve a trifid cardinal pro- 

 cess is made to fill the uncovered 

 portion of the fissure, and serve as the 

 point of attachment to the cardinal 

 muscle ; under this process a longit udinal 

 mesial ridge extends nearly to the 

 margin, and on either side are elongated, 

 ramified adductor scars; the reniform 

 impressions, after dividing the above 

 named muscle, extend by an outward 

 oblique curve to nar the margin, when, 

 turning backward and inward, termi- 



