GENERAL INDEX. 79 



Antliodus simplex N. & W 11,33,39,44* 



sulcatus N. & W- 11,33, 42, 45* 



? (Chomatodus) truncatus Ag 11,33; VI, 412 



Apioceras turbiniforme M. & W 111,444* 



Aploceras eurtum M. & W 11,388* 



Arachnida Ill, 560,568 



Arachnocrinufe M. & W 11,177 



bulbosus (Hall) II, 177 



(?) pisiformis Boem 11,177 



Archegosaurus II, 133 



Archaeocidaridae McCoy 11.229, !4; 111,523; V.510; VII.333 



Archaeoeidaris McCoy 11,226,294; 111,523; YII.337 



edgarensis W. & Mill YII.337* 



illlnoiensis W. & Mill VII, 338* 



mucronatus M. & W 11,295*; VII, 337 



norwoodi Hall 11,296 



spiniclavatus W. & Mill VH.337* 



wortheni Hall 11,227 



sp. indet. (jaw plate?) VII, PL xxx, flg. 16* 



sp. indet V, PI. xxiv, fig. 13* 



Archaeocyathus Billings VIII, 211, 216,240 



atlanticus Bill VIII, 240 



billingsi Walcott VIH.240 



(?) pavonoides Matthew VIII,2tO 



Archimedes LeSueur (Owen) 111,504; VIII,353, 396. MS 



communis Ulrich VIII.568, 573* 



compaetus Ulrich VIII, 568, 572* 



distans Ulrich VHI,568,578* 



grandis Ulrich VIII, 568, 569* 



intermedius Uh-ich VIII.568, 574* 



invaginatus Ulrich VIII, 568, 575* 



laxus Hall VIII,568,580* 



meekanus Hall .*. VIII,568, 578* 



negligent UMch Vni,568, 569* 



owenanus Hall v VIII,568, 570* 



perminimus Uh-ich VIII, 568, 572* 



proutanus Uh-ich VIII,568, 576* 



( ' ' reversus Hall) VIII, 571* 



swallovanus Hall Vni,568, 574* 



sublaxus Uh-ich VIII.568,579* 



terebriformis UJrich VIII, 568, 575* 



wortheni Hall VIII, 396, 568, 571* 



Architarbus rotundatus Scudder Ill, 568t 



Arcidae 11,156 



Argonauta gondola Adams V.525 



Arthroclema Billings VIII, 2%, 363, 400. 641 



angulare Uh-ich VIII, 641* 



billiugsi Ulrich VIII, 642 



pulchellum Billings Vin, 400, 641* 



Arthronema Esch-choltz VIII, 400 



( " ) tenue Uhrich VIII, 400 



Arthropleura Jordan and Von Meyer 111,559 



( " ) ferox Salt 111,559 



Arthropora Uh-ich VIII, 349, 393 



shafferi (Meek) VIII,308t,393 



ArthrostylidEE VIII.362,400 



