600 NORTH AMERICAN INDEX FOSSILS. 



j / . With several oblique folds on the 

 columella. 



CLXXXVI1I. Oliva. 

 y. Without folds CXCVI. Conns. 



d. Aperture blunt behind, scarcely widening 



forward 6 / '. 



6 / . Lip and columella smooth, spire 

 conical or flat. ...CXCVI. Conus. 

 6 / . Lip and columella denticulate, spire 

 mostly covered. 



CXLIII. Erato. 



%%%%■ Inner lip expanded, partly covering body 



whorl and spire e. 



e. Outer lip smooth. 



CXXXIX. Orthaulax. 



e. Outer lip lobed. 



CXXXVIII. Pugnellus. 



57. Whorls strongly embracing, angulated 11'. 



IF. Spire very flat, canal strongly contracted below body 



whorl 22f. 



22f. Protoconch papillose, columella plicate, outer 



lip lirate CLII. Tudicla. 



22|. Protoconch not papillose, without columellar 



plicae or lirse CLIII. Pyropsis. 



II 7 . Spire of moderate height, often continuously conical, 



whorls angulated 23 f . 



23f. With canal abruptly contracted below body whorl 



outer whorl biangular CLIV. Perisolax. 



23-f. Canal gradually contracted below body whorl. 



5*. 



5 J. Shell with flat or concave sloping shoulders 

 and angle nodose, keeled or spinose, at 

 least in young ./. 



f. Shell small 7' '. 



7 7 . Canal straight. 



CLVIII. Levifusus. 

 7 / . Canal reflexed. 



CLVIL Strepsidura. 



f. Shell large 8 f . 



8' '. Suture channeled. 



CLVI. Sycotypus. 

 8 / '. Suture not channeled. 



CLV. Fulgur. 



5 + . Shell with several angulations, and wide 



patulous canal .g. 



g. Spire low, angulations pronounced on 



body whorl CLXIX. Fulguroficus. 



g. Spire moderately high, angulations less 

 pronounced on body whorl. 



CLXX. Fusoficula. 

 25*. Shell fusiform, but thick set, spire of few rapidly enlarging whorls. V . 



