CAMBRIAN GEOLOGY AND PALEONTOLOGY 



No. 2.— CAMBRIAN TRILOBITES 



By CHARLES D. WALCOTT 



(With Six Plates) 



CONTEXTS 



Page 



Burlingidce, new family 14 



Burlingia, new genus 14 



Burlingia hectori, new species 15 



Alhertella, new genus ,. 18 



" helenct, new species 19 



" boszvorthi, new species 22 



Oryctocara, new genus 23 



" geikiei, new species 23 



Zacanthoides idahocnsis, new species 26 



Neoleniis iniJatus, new species 30 



" inteniicdiiis, new species 34 



" '■ pugio, new variety 35 



" supcrhus, new species 36 



Bathynriscus ornattis, new species 39 



The monograph on the Cambrian Brachiopoda,^ upon which I have 

 been working- for so long, is about ready for the press, and attention 

 is now being given to the preliminary study of some of the American 

 Cambrian trilobites. If students and collectors in any country know 

 of interesting or new forms of Cambrian or Lower Ordovician trilo- 

 bites, or of more perfect specimens representing previously described 

 forms, I should very much like to have their cooperation in making 

 this investigation as thorough and complete as possible. 



This is the first of a series of brief papers that will be published 

 as new' material of interest is worked up. The classification of Dr. 

 Charles E. Beecher" will be followed, in the preliminar}- studies at 

 least, with such modifications as may appear necessary during the 

 course of the investigations. 



^ To be published as Monograph LI of the U. S. Geological Survey. 

 'American Jour. Sci., 4th ser., vol. iii, 1897. pp. 89-106, 181-207. 



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