152 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. I lull. 87. 



Atrypa hystrix ITall. Cheiuuni;' (Dev.). 



Atrypa hystrix Hall, (ieolo-y N. Y. ; Rep. Fourth DLst., 1843, p. 271, li^^ 2.— Rog- 

 ers, Geol. l\-nusylvaiiia, II, Ft. II, 1858, p. 829, fig 681.— Hall, I'al. Now 

 York, IV, 1867, p. 326, pi. 53A, figs. 15-17.— Whitlield, Geol. Wiscousin, IV, 

 1882, p. 333, pi. 26, fig. 5.— Hall aucl Clarke, Pal. New York, VIII, Pt. II, 

 1895, pi. 55, fig. 23. 



Loc. Steuben County, New York; Pennsylvania; Rocklord, Iowa; Milwaukee, 

 Wisconsin. 



Ohs. See A. spinosa. 



Atrypa hystrix elongata Webster. Chemuug (Dev.). 



Atryjia Iiystrix var. elongata Webster, American Nat., XXII, 1888, p. 1104. 

 Loc. Near Rocklord, Iowa. 



Atrypa hystrix occidentalis Hall. Middle Devonian. 



Atrypa aspera A'ar. oci-identalis Hall, Geol. Survey Iowa, I, Pt. II, 1858, p. 515, 



pi. 6, fig. 3.— Hall and Clarke, Pal. New York, VIII, Pt. II, 1895, pi. 55, figs. 



18-20. 

 Atrypa aspera Meek and Worthen, Geol. Survey Illinois, III, 1868, p. 403, pi. 13, 



fig. 7. 

 Loc. Independence, Davenport, etc., Iowa; Rock Island, Illinois. 

 Obs. This variety is probably more closely related to A. hystrix than to A. aspera. 



Atrypa hystrix planosulcata Webster. Chemung' (Dev.). 



Atrypa hystrix var. planosulcata Webster, American Nat., XXII, 1888, p. 1104. 

 Loc. Near Rockford, Iowa. 



Atrypa imbricata Hall (non Sowerby)=A. uodostriata. 

 Atrypa impressa Hall=:A. reticularis imi^ressa. 

 Atrypa impressa Shaler (non Hall) = A. reticularis. 

 Atrypa increbescens Hall=Rliyucliotrema imequivalvis. 

 Atrypa intermedia Hall = Wliittieldella iutermedia. 

 Atrypa interplicata Hall=Auastropbia interplicata. 

 Atrypa Itevis Vauuxem=Meristella be vis. 

 Atrypa lacunosa Yauuxem = Anastrophia verueuili. 

 Atrypa lamellata Hall = Rbyuchonella lamellata. 



Atrypa(?) lara (Billings). Anticosti (Sil.). 



Athyris lara Billings, Catalogue Sil. Foss. Anticosti, 1866, p. 47. 



Atrypa lara Davidson, Snppl. British Sil. Brach., PaltBontographical Soc, 1882, 

 p. 121. 



Loc. Anticosti. 



Ohs. Said to have a true Atrypa loop and spires. The exterior is smooth. Prob- 

 ably the type of a new genus. 



Atrypa laticorrugata Foerste. Clinton (Sil.). 



Atrypa lati-corrugata Foerste, Geol. Ohio, VII, 1895, p. 591, pi. 57A, fig. 16. 

 Loc. Dayton, Ohio. 



Atrypa laticostata Hall (non Phillips) =Camarota!cbia contracta. 

 Atrypa lentiformis Vanuxem=A. reticularis. 

 Atrypa limitaris Hall=Leiorhyncbus limitare. 



Atrypa (?) lingulata Kicollet. Lower Carboniferous. 



Atrypa lingulata Nicollet, Rep. Hydrog. Basin Up. Miss. River, 1843, p. 167. 

 "Subfusiform; valves nearly ecjually convex; inferior valve with a longitudinal 

 sinus ; base ijrojecting in the middle, the margin of the projection truncated. 

 St. Louis, and also the bluff beneath Rockwell, Illinois." 



