CAMBRIAN BRACHIOPODA: ACROTRETA: LINNARSSON- 

 ELLA; OBOLUS; WITH DESCRIPTIONS OF NEW 

 SPECIES. 



By Charles D. Walcott. 



Honorary Curator, Division of Stratigraphic Paleontology. 



I had hoped to complete the monograph on the Cambrian Brachi- 

 opoda before this time, but owing- to the large accessions of new 

 material and to increased administrative duties this has been imprac- 

 ticable. The following additionaP notes are therefore published, in 

 the hope that the}' may be of service to students prior to the appear- 

 ance of the monograph. 



Genus ACROTRETA Kutorga. 



1848. Acrotreta Kutorga, Verhandl. der russic-h-Kais. ]Min. Gesellsch., St. Peters- 

 burg, p. 275. 



1853. Acrotreta Davidson, Introduction British Fossil Brachiopoda, p. 13.3. 



1865. Acrotreta von Seebach, Feitschr. deutsch. geol. Gesellsch., XVII, p. 341. 



1865. Acrotreta BiLLiNCiS, Paleozoic Fossils, I, p. 216. 



1871. Acrotreta ? Davidson, British Sil. Brachiopoda, p. 343. 



1872. Acrotreta Meek, Sixth Ann. Kept. U. S. Geol. Sur. Terr., p. 462. 

 1874. Acrotreta White, Geog. Sur. ^V. 100th Merid., IV, Pt. 1, p. 53. 



1876. Acrotreta Linnaksson, Bihang till K. Swenska vet. Acad. Handl., Ill, 



No. 12, Brachiopoda Paradoxides Beds of Sweden, p. 16. 

 1883. Acrotreta Davidson, British Sil. Brach. Supl., p. 213. 



^Xote on the genus Lingulepis, Amer. Jour. Sci., 4th ser.. Ill, 1897, pp. 404, 405. 



Cambrian Bracliiopoda: Genera Iphidea and Yorkia, with descriptions of new 

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

 707-718. 



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

 -lianerates of the Narragansett Basin, Rhode Island, Am. Jour. Sci., 4th ser., VI, 

 1S98, pp. .327, 328. 



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

 I 'roc. V. S. Nat. Mus., XXI, 1898, pp. 385-420. 



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

 Westonia; with descriptions of new species, Pro^. U. S. Nat. Mus., XXIII, 1901, pji. 

 609-695. 



Proceedings U. S. National Museum, Vol. X.XV— No. 1299. 

 Proc. N. M. vol, XXV — <»2 37 577 



