156 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. [bull. 87. 



Atrypa sordida Hall=Rhynchonella sordida. 



Atrypa spinosa Hall, Corniferous-Cheraung (Dev.). 



Atrypa spinosa Hall, Geol. New York; Rep. Fourth Dist., 1843, p. 200, fii;s. 

 1, 2.— Whitfield, C4eol. Wiaconsiu, IV, 1882, p. 333, pi. 26, iigs. 7, 8.— Hall and 

 Clarke, Pal. New York, VIII, I't. II, 1895, pi. 55, figs. 21, 22. 



Atrypa dumosa Hall, Geol. New York; Rep. Fourth Dist., 1843, p. 271, fig. 1. 



Atrypa aspora Hall (non Schlotheim), Tenth Rep. New York State Cab. Nat. 

 Hist., 1857, p. 168.— Rogers, Geol. Pennsylvania, II, 1858, Pt. II, p. 828, fig. 

 671.— Meek, Trans. Chicago Acad. Sci., I, 1868, p. 96, pi. 13, fig. 12.— Net- 

 telroth, Kentucky Fossil Shells, Mem. Kentucky Geol. Survey, 1889, p. 88, 

 pi. 14, figs. 1-11. 



Atrypa aspera vel aspera Hall, Pal. New York, IV, 1867, p. 322, pi. 53A, figs. 

 1-14, 18, 24, 25. 



Atrypa aspera? Meek, Simpson's Rep. Expl. Great Basin Terr. Utah, 1876, p, 

 348, pi. 1, fig. 2. 



Atrypa reticularis var. aspera Whiteaves, Cont. Canadian Pal., I, 1891, pp. 

 229, 289. 



Loc. New York; Pennsylvania; Maryland; Virginia; Kentucky; Ohio; Illinois; 

 Iowa; Wisconsin; Ontario; Lockhart and Athabasca rivers, etc., Northwest 

 Territory, Canada. 



Ohs. The Corniferous limestone specimens of A. spinosa are not always easily 

 distinguished from A. reticularis. The fewer plications of the former, 

 however, will usually distinguish it from the latter species. This tendency 

 to fewer plications is more marked in the Hamilton formation and attains 

 its climax in the Chemung, where the species is known as A. hystrix. 



Atrypa subtrigonalis Hall=Rbynchonella subtrigonalis. 



Atrypa sulcata Vauuxem=Whittieldella sulcata. 



Atrypa tenuilineata HaIl=:Daliiianella teuuilineata. 



Atrypa tribulis Hall = A. reticularis. 



Atrypa unguiformis Hall = Hipparionyx proximus. 



Atrypa unisulcata Conrad = Pen tagoni a unisulcata. 



ATRYPINA Hall and Clarke. Genotype Leptocoelia imbricata Hall. 



Atrypina Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 161, fig. 152;— 

 Thirteenth Ann. Rep. New York State Geologist, 1895, p. 815. 



Atrypina clintoni Hall and Clarke. Clinton (Sil.). 



Atrypina clintoni Hall and Clarke, Pal. New York, VIII, Pt. II, 1893, p. 162, pi. 



53, figs. 7, 17-19; pi. 83, fig. 6. 

 Loc. Orleans County, New York. 



Atrypina disparilis (Hall). Niagara (Sil.). 



Atrypa disparilis Hall, Pal. New York, II, 1852, p. 277, pi. 57, fig. 6.— Hall and 



Clarke, Pal. Now York, VIII, Pt. II, 1895, pi. 53, figs. 1-4. 

 Leptoccelia disparilis Hall, Twelfth Rep. New York State Cab. Nat. Hist., 1859, 



p. 77. 

 Trematospira? disparilis Hall, Sixteenth Rep., Ibidem, 1863, p. 60; — Trans. 



Albany Institute, IV, 1863, p. 146. 

 Ccelospira disparilis Hall, Twenty-eighth Rep. New York State Mns. Nat. Hist., 



1879, p. 162, pi. 25, figs. 39-43 ;— Eleventh Rep. State Geol. Indiana, 1882, 



p. 363, pi. 25, figs. 39-43. — Beecher and Clarke, Mem. New York State Mus. 



Nat. Hist., I, 1889, ]). 64, pi. 5, figs. 17-23. 

 Loc. Wolcott, New York ; Waldron, Indiana. 

 Oha. Davidson in 1882 regarded this species the same as Atrypa barrandei of 



Europe. 



