152 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. Lhull.87. 



Atrypa hystrix Hall. Ohemiin.i; (Dev.). 



Atrypa liystrix Hall, Geolojry N. Y. ; Rep. Fourth Dist., 1843, p. 271, fijj. 2.— Rog- 

 ers, Geol. Peunsylvauia, II, Ft. II, 1858, p. 829, fig. 681.— Hall, Pal. New 

 Y'ork, I"\', 1867, p. 326, pi. 53A, figs. 15-17.— Whitfield, Geol. Wisconsin, IV, 

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

 1895, pi. 55, fig. 23. 



Lov. Steuben County, New York; Peunsylvauia; Rocklord, Iowa; Milwaukee, 

 Wisconsin. 



Obx. S<'(> A. spinosa. 



Atrypa hystrix elongata Webster. Chemung (Dev.). 



Atrypa liystrix var. elongata Webster, American Nat., XXII, 1888, \k llO-l. 

 Loc. N(!ar Kooklbrd, Iowa. 



Atrypa hystrix occidentalis Hall. Middle Devonian. 



Atrypa asjtera var. occidentalis 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. 103, pi. 13, 

 fig. 7. 



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



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



Atrypa hystrix planosulcata Webster. Chemung (Dev.). 



Atrypa hystrix var. })lanosulcata Webster, American Nat., XXII, 1888, p. 1104. 



Loc. Near Kockford, Iowa. 

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

 Atrypa impressa Hall=A. reticularis impressa. 

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

 Atrypa increbescens Hall=Kbyuchotrema intequivalvis., 

 Atrypa intermedia Hall = Wliitfieldella iutermedia. 

 Atrypa interplicata Hall=Auastrophia iuterplicata. 

 Atrypa hievis Vauuxem=Meristella Levis. 

 Atrypa lacunosa Vanuxem=:Anastrophia verneuili. 

 Atrypa lamellata Hall=Rhynchonella lamellata. 



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



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



Atrypa lara Davidson, Suppl. Britisli Sil. Hrach., PaLt'ontographical Soc, 1882, 

 p. 121. 



Loc. Anticosti. 



Ohn. Said to have a true Atryjia loop and spires. The exterior is smooth. Prob- 

 ably the type of a new genus. 



Atrypa laticorrugata Foerste. Clinton (Sil.). 



Atrypa lali-coi rugata Foerste, Geol. Ohio, ^'II, 1895, p. 591, jd. 57A, fig. 16. 



Loc. Dayton, Ohio. 

 Atrypa laticostata Hall (uon Phillips) =Camarot(JLU'hia coutracta. 

 Atrypa lentiformis Vanuxem=A. reticularis. 

 Atrypa limitaris Hall=Leiorhynclius limitare. 

 Atrypa (?) lingulata Nicollet. Lower Carboniferous. 



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

 "Subfusiforni; valves nearly equally convex; inferior valve with a longitudinal 



sinus ; base ])rojecting in the middle, the margin of the projection truncated. 



St. Louis, and also the blufi' beneath Rockwell, Illinois." 



