346 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ^7 



PAGE 



Saiikia leucosia, new species (pi. 67, figs. 14-170) 379 



Saiikia lodcnsis (Whitfield) (pi. 65, figs. 1-3) 379 



Saukia marica (Walcott) (pi. 64, figs. 6, 6a) 380 



Saukia pepinensis (Owen) (pi. 67, figs. 1-130) 381 



Saukia pyrcne, new species (pi. 67, figs. 18-20) 382 



Saukia riistica, new species (text figs. 18, 19) 383 



Saukia stosei, new species (pi. 69, figs. 3-5 ; pi. 70, figs. 12, 120) 384 

 Saukia zvardi, new species (pi. 69, figs, i, 2) 384 



Genus Osceolia, new genus 385 



Osceolia osceola (Hall) (pi. 67, figs. 4-10) 386 



Genus Conokephalina Brogger 387 



ConokepJialina misa (Hall) (pi. 68, figs. 1-3) 387 



Genus Calvinclla, new genus 388 



Calvinella newtonensis (Weller) (pi. 70, figs. 7-11, iia) .'89 



Calvinella ocarkensis. new species (pi. 70, figs. 1-6) 389 



Calvinella spiniger (Hall) (pi. 68, figs. 11-230) 390 



Cali'incUa tciinisciilpta, new species (pi. 64, figs. 7, 7a) 391 



ILLUSTRATIONS 

 Plate 60. Dikelocephahis ininnesotensis 392 



61. Dikelocephahis ininnesotensis, Dikelocephahis niinnesotensis 



var. and Saukia crassimarginata 394 



62. Dikelocephahis vanhornei and Dikelocephalus ininnesotensis ?? 396 



63. Dikelocephalus hartti and Dikelocephalus f tribulis 398 



64. Dikelocephalus ? dalyi, Saukia marica. Calvinella tcniusculpta 



and Conokephalina ornata 400 



65. Saukia lodensis, Dikelocephalus texanus, Dikelocephahis ? 



limbatus and Saukia crassimarginata 402 



66. Dikelocephalus ininnesotensis and Saukia crassimarginata .... 404 



67. Saukia pepinensis, Saukia leucosia, Saukia pyrcne and Saukia 



fallax 406 



68. Conokephalina misa, Osceolia osceola and Calvinella spiniger. . 408 



69. Saukia tuardi and Saukia stosei 410 



70. Calvinella o::arkensis, Calvinella neti'tonensis and Saukia stosei 412 

 Text figs. 13-16. Saukia coloradoensis 37^ 



17. Saukia jiinia 378 



18-20. Saukia rustica 383 



INTRODUCTION 



Many years ag'o I planned an investi^s^arion of the genus Dikelo- 

 cephalus, but under the pressure of other studies and administrative 

 duties it was delayed. Dr. L. C. \A'^ooster in 1883, Dr. Cooper Curtice 

 in 1884, and Dr. Charles Schuchert in 1896 all made extensive col- 

 lections from the Cambrian of Wisconsin and Minnesota, and it is 

 from this material that many of the illustrations in this paper are 

 taken and the association of species determined. 



With but slight study in the past I have referred several species 

 represented by fragments to Dikelocephalus, and also accepted similar 



