CAMBRIAN GEOLOGY AND PALEONTOLOGY 



No. 3.— CA^IBRIAN BRACHIOPODA: DESCRIPTIONS OF 

 NEW GENERA AND SPECIES 



By CHARLES D. WALCOTT 

 (With Four Plates) 



This is the eighth paper resuhing from the prehminary studies for 

 Monograph 51 of the U. S. Geological Survey. I expect to use many 

 new generic and specific names in lists of fossils occurring in geo- 

 logic sections and in a forthcoming paper on the classification of the 

 Brachiopoda, and think it is best to describe the fossils before using 

 their names elsewhere. 



The paper on the classification will be the last of the preliminary 

 papers, as the monograph is now in the editor's hands and should 

 appear in 1909. 



The previous papers in this series are : 



I. Note on the genus Lingulcpis. American Jour. Sci., 4th ser., Ill, 1897, 

 pp. 404-405. 

 II. Cambrian Brachiopoda : Genera Iphidia and Yorkia, with descriptions 

 of new species of each, and of the genus AcrotJiclc. Proc. U. S. Na- 

 tional Museum, XIX, 1897, pp. 707-718. 



III. Note on the brachiopod fauna of the quartzitic pebbles of the Car- 



boniferous conglomerates of the Narragansett Basin, Rhode Island. 

 American Jour. Sci.. 4th ser., VI, 1898, pp. 327-328. 



IV. Cambrian Brachiopoda : Obolus and Lingtdella, with descriptions of 



new species. Proc. U. S. National Museum, XXI, 1898, pp. 385-420. 

 V. Cambrian Brachiopoda: Obolella, subgenus Glyptias; Bicia; Obolus, 

 subgenus IVcsfoiiia; with descriptions of new species. Proc. U. S. 

 National Museum, XXIII, 1901, pp. 669-695. 

 VI. Cambrian Brachiopoda: Acrotrcta ; Linnarsson-cUa ; Obolus; with de- 

 scriptions of new species. Proc, U. S. National Museum, XXV, 1902, 

 PP- 577-612. 

 VII. Cambrian Brachiopoda, with descriptions of new genera and species. 

 Proc. U. S. National Museum, XXVIII, 1905, pp. 227-2,^7. 



There are also a number of Cambrian brachiopoda described in 

 two papers on the Cambrian faunas of China : 



Caml)rian Faunas of China. Proc. U. S. National Museum, XXIX, 1905, 



pp. 1-106. 

 Cambrian Faunas of Cliina. Proc. U. S. National Museum, XXX, 1906, 



PP- 563-595- 



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