CAMBRIAN BRACHIOPODA WITH DESCRIPTIONS OF NEW 

 GENERA AND SPECIES. 



By Charles D. Walcott, 



Honorary Curator, Division of Stratigraphic Paleontology. 



The following genera and subgenera are referred to in this paper, 

 either in describing them or in referring new species to them: * 



Protremata: BillingseUa; BllUng-selhi {(Hus/a); Nisa-sia; JVisusia 

 {Jamesella); StropJioniena {EostropKomena) ; Ovtlih {Plectorthls) ; 

 Orthis (Orusia); OrtJiis {Finkelnhurgia); Protorthh; Protorthis 

 {Loperia); Syntrophia; Polytcochia; Swantonia. 



Neotremata: Oholella; Acrotreta; Acrothyra; Acrothele. 



Atremata: Tphidella,' Kutorgina; Ru>^tdl(i; P/ceUonius; Cartlcea; 

 Quehecia; Elhmia; ScJmchertma; Oholas; Oholnx {LlngnleUa); Oho- 

 lus {Lingtdepis) ; Oholm ( Westonia). 



This is the sixth paper resulting from the pi-eliminary studies for 

 the monograph on the Cambrian Brachiopoda. These notes/' like 

 those that have preceded, are published in the hope that they may be 

 of service to students prior to the appearance of the monograph. 



Genus BILLINGSELLA Hall and Clarke. 



1857. Orthis Billings, Report (leologit-al Survey of Canada, \k 297. 

 1860. Orfhlx SituMARD, Trans. 8t. Louis Aead. Sci., I, p. (527. 



«Note on the genus Lingulepis, Anier. Jour. Sci., 4th ser., Ill, 1897, pp. 404, 405. 



Cambrian Brachiopoda: Genera Iphidea and Yorkia, with descriptions of new- 

 species of each, and of the genus Acrothele, Proc. U. S. Nat. Mus., XIX, 1897, pp. 

 707-718. 



Note on the brachiopod fauna of the cpiartzitic pebbles of the Carboniferous con- 

 glomerates of the Narragansett Basin, Rhode Island, Amer. Jour. Sci., 4th ser., VI, 

 1898, pp. 327, 328. 



Cambrian Brachiopoda: Obolus and Lingulella, with descriptions of new species, 

 Proc. U. S. Nat. Mus., XXI, 1898, pp. .385-420. 



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

 Westonia; with descriptions of new species, Proc. U. S. Nat. Mus., XXIII, 1901, pp. 

 669-695. 



Cam/)rian Brachiopoda: Acrotreta; Linnarssonella; Obolus; with descriptions of 

 new species, Proc. U. S. Nat. Mus., XXV, 1902, pp. 577-612. 



Proceedings U. S. National Museum, Vol. XXVIII— No. 1395. 



227 



