INDEX TO SECTION II. 487 



COCHLIODONTS : 



Pace. 



Fsepliodus, Agassiz, ....-.-... 417 



— ? retkulatiis, St. J. and W., Kinderhook, - - - 417 



ICHTIIYODORULITES : 



Ctenacantlius, Agassiz, ... .... 420 



— spectabilis, St. J. and W., Kinderhook, - - - 420 



— scidptus, St. J. and W., Kinderhook, - - - - 421 



— varians, St. J. and W., Kinderhook, - - - 422 



— speciosus, St. J. and W., Kinderhook,- - - - 424 



— gradocostus, St. J. and W., U. Burlington, - - 425 



— Burlingtonensis, St. J. and W., U. Burlington, - - 426 



— Keokuk, St. J. and W., Keokuk, .... 427 



— exeavatus, St. J. and W., Keokuk, .... 428 



— gemmatus, St. J. and W., St. Louis, - - - 429 



— pugiunculus, St. J. and W., St. Louis, - - - 430 



— similis, St. J. and W., Chester, .... 431 

 Acondylacantlius, St. J. and W., 433 



— gracilis, St. J. and W., Kinderhook, - - - 433 



— cequicostatus, St. J. and W., Keokuk, - - - 434 

 Aster optychius, Agassiz, 435 



— ? vetustus, St. J. and W., Kinderhook, - - 435 



— Keokuk, St. J. and AY.. Keokuk, - 436 



— St. Ludovici, St. J. and W., St. Louis, - - - 437 



— ? tenuis, St. J. and W., Chester, .... 433 



— bellulus, St. J. and W., Coal Meas., - 439 

 Geisacanthas, St. J. and W., 440 



— stellatus, St. J. and W., St. Louis, - 440 



— bullatus, St. J. and W., Chester, - - - 441 

 Anaclitacanthus, St. J. and W., - ■ 442 



— semicostatus, St. J. and W., U. Burlington, - - 443 

 Bythiacanthus, St. J. and W., , 444 



— Van Hornei, St. J. and W., St. Louis, - - - 445 

 Glymmatacantlms, St. J. and W., 446 



— Irishii, St. J. and W., Kinderhook, - - - 447 

 Physonemus, Agassiz, 448 



— proclivas, St. J. and W., Kinderhook, - -. 451 



— depressus, St. J. and W., Kinderhook, - - - 452 



— carinatus, St. J. and W., Kinderhook, - - - 452 



— parvulus, St. J. and W., Keokuk, - - 453 



— Altonensis, St. J. and,W., St. Louis, - - - 454 



