l6o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



PAGE 



32. Crepicephalus dis Walcott, C. camiro Walcott, C. cooscnsis Walcott, 



and Crepiccplialus sp. undt 246 



22. Crepicephalus tripunctatus (Whitfield), C. tripunctatus magnispinus 



Walcott, C. coria Walcott, and C. upis Walcott 248 



34. Lonchocephalus pholus Walcott, L. plena Walcott, L. chippewaensis 



Owen, L. minutus (Bradley), Saratogia wisconsensis (Owen), 

 S. calcifera (Walcott), Crepicephalus unzia Walcott, Loncho- 

 cephalus minor (Shumard), and L. bunus Walcott 250 



35. Crepicephalus unca Walcott, Saratogia volux Walcott, S. hera Wal- 



cott, 5". arses Walcott, S. aruno Walcott, and Lonchocephalus 



appalachia Walcott 252 



26. Lonchocephalus sospita Walcott, Hanburia gloriosa Walcott, Vanuxe- 

 mella contractor Walcott, V. nortia Walcott, Agraulos stator 

 Walcott, Karlia minor Walcott, K. stephenensis Walcott, Tsi- 

 nania cleora Walcott, and T. elongata Walcott 254 



37. Hyolithes primordialis Hall, Anomocarella onusta Whitfield, Pagodia 



thea Walcott, Lonchocephalus chippewaensis Owen, Menomonia 

 calymenoidcs (Whitfield), Crepicephalus ioiuensis (Owen), Dicel- 

 lomus politus Hall, and Obolus matinalis Hall 256 



38. Wanneria walcottana (Wanner) 258 



INTRODUCTION 



The present paper is the second of this series on Cambrian Geology 

 and Paleontology that bears the title " Cambrian Trilobites." The 

 first, published in 1908,^ includes descriptions and illustrations of a 

 number of unusual Middle Cambrian genera and species. Several 

 subsequent papers have dealt with trilobites of a particular family 

 or genus or from a stratigraphic view. 

 These include : 

 " Olenellus and other Genera of the Mesonacidee." [Smithsonian Misc. 



Coll., Vol. 53, No. 6, 1910.] 

 "Cambrian Faunas of China." [Idem, Vol. 57, No. 4, 191 1.] 

 " Middle Cambrian Branchiopoda, Malacostraca, Trilobita, and Merosto- 



mata." [Idem, Vol. 57, No. 6, 1912.] 

 " Cambro-Ordovician Boundary in British Columbia with Description of 



Fossils." [Idem, Vol. 57, No. 7, 1912.] 

 " The Sardinian Cambrian Genus Olenopsis in America." [Idem, Vol. 57, 



No. 8, 1912.] 

 " New York Potsdam-Hoyt Fauna." [Idem, Vol. 57, No. 9, 1912.] 

 "New Lower Cambrian Subfauna." [Idem, Vol. 57, No. 11, 1913.] 

 " Dikelocephalus and other Genera of the Dikelocephalinse." [Idem, Vol. 



57, No. 13, 1914.] 

 " Cambrian Faunas of Eastern Asia." [Idem, Vol. 64, No. i, 1914.] 



* " Cambrian Trilobites," Smithsonian Misc. Coll., Vol. 53, No. 2, pp. 13-52, 

 pis. 1-6. 



