150 SYNOPSIS OF AMERICAN FOSSIL HKACHIOPODA. [bull. 87. 



Athyris spiriferoides (Eaton)— Continued. 



Athyris coneontrica IJilliiigs, C.'madian Jour., VI, 1861, p. 145, figs. 54-57; — Cieol. 



Canada, 1863, p. 373, iig. 399; p. 385, fig. 421. 

 Jah'. Now York ; Pennsj Ivania ; Maryland ; Virginia ; Cayuga and Widder, Canada. 



Atliyris squamosa Wortlien=Cleiothyris squamosa. 

 Athyris sublamellosa Hall=Cleiotliyri8 roissyi. 

 Atbyris subquadrata PIall = Seminula sub(|uadiata. 

 Athyris subtilita Hall = Seminula argentea. 

 Athyris trinucleus Hall = Seminula trinucleus. 

 Athyris trisinuatus McChesney=Meristina trisiuuata. 

 Athyris tumida Eoemer=Meristiiia tumida. 



Athyris (?) tumidula liillings. Anticosti (Si!.). 



Athyris tnmiduLi liillings. Catalogue Sil. Foss. Anticosti, 1866, p. 47. 

 Loc. Anticosti. 

 Ohs. Probably a species of Whitfieldella. 



Athyris (?) turgida Shaler. Anticosti (Sil.). 



Athyris turgida Shaler, Bull. Mus. Comp. Zool., 4, 1865, p. 69. — Miller, N. Ameri- 

 can Geol. Pal., 1889, p. 335. 

 Loc. Anticosti. 



Athyris ultra varica McChesney. Keokulv (L. Carb.). 



Athyris ultravarica McChesney, Descriptions New Pal. Fossils, 1861, p. 79. 



Loc. Keokuk, Iowa. 

 Athyris umbonata Billings =Hindella umbonata. 

 Athyris unisulcata 13illinji8 = Pentagonia nnisulcata. 

 Athyris vittata Hall=A. fultonensis. 



ATRYPA Balman. Genotype Anomia reticularis Liniifeus. 



Atrypa Dalinan, Kongl. Svenska Vet.-Akad. Handl., f.ir 1827, 1828, p. 102.— 

 Billings, Canadian Nat. Geol., I, 1856, p. 134; — Canadian Jour., VI, 1861, p. 

 264.— Whitfield, Twentieth Rep. N. Y. State Cab. Nat. Hist., 1867, p. 141, pi. 

 1.— Hall, Pal. New York, IV, 1867, p. 312.— Nettelroth, Kentucky Fossil 

 Shells, Mem. Kentucky Geol. Survey, 1889, p. 88.— Hall and Clarke, Pal. New 

 Y'ork, VIII, Pt. II, 1893, p. 163;— Thirteenth Ann. Rep. N. Y. State Geolo- 

 gist, 1895, p. 818. 



Atrypa tequiradiata Conrad = Ren ssel.Tria requiradiata. 



Atrypa acutiplicata Conrad =:Anoplotheca acutiplicafa. 



Atrypa acutirostrum Hall = Rhynchonella acutirostiis. 



Atrypa affinis Vanuxem = A. reticularis. 



Atrypa altilis Hall = Camarotoechia plena. 



Atrypa ambigua Hall = Camarella ambigua. 



Atrypa aprinis Hall = IIom(Pospira ai)riiiiformis. 



Atrypa arata Conrad=Pentamerella arata. 



Atrypa aspera American authors=A. spinosa, 



Atrypa aspera occidentalis Hall = A. hystrix occidentalis. 



Atrj'pa bidens Hall = RhynchonelIa bidens. 



Atrypa bidentata Hnll=Rhynchonella bidentata 



Atrypa bisulcata Hall (non Vanuxem)=Cyclos])ira bisulcata. 



Atrypa bisulcata Vanuxem (non Hall) = Whitfieldella bisulcata. 



Atrypa brevirostria Hall=Anastrophia brevirostris. 



