1200 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



STREPTELASMA Continued. 



N. A. Index Fossils, 1, 1906, p. 54. Cumings, 32d Ann. Rep. Dep. Geol. Nat. 



Res. Indiana, 1908, p. 700. Zittel-Eastman Textb. Pal., 2d ed., 1913, 



p. 82. 

 Petraia Zittel, Handb. Pal., 1, 1879, p. 226. Roemer, Leth. geog., pt. 1, Leth. 



Pal., 1883, p. 410. Miller, N. A. Geol. Pal., 1889, p. 199. Sherzer, Amer. 



Geol., 7, 1891, pp. 278-283. Koken, Die Leitfossilien, Leipzig, 1896, p. 



313. Lambe, Cont. Canadian Pal., Geol. Surv. Canada, 4, pt. 2, 1901, p. 104. 

 Observation. The type of Streptelasma has been cited by most authors as S. 

 expansum because this species was the first to follow the generic diagnosis. This 

 species, however, was founded upon a cystid plate (Blastoidocrinus carcaridens). 

 Hall undoubtedly had S. corniculum in mind when he drew up the generic 

 diagnosis, and S. expansum came first simply because of geological position. 

 Lambe has employed Petraia for certain American species usually referred to 

 Streptelasma but differing in having a deep calyx, no tabulae, dissepiments, or 

 columella. Until the type of Petraia is better known it is believed best to refer 

 these species to Streptelasma. 



Streptelasma angulatum (Billings). 



Petraia angulata Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 103, fig. 



90a, b (Adv. sheets, 1862); Cat. Sil. Foss. Anticosti, Geol. Surv. Canada, 



1866, p. 7 (loc. ref.). 

 Streptelasma angulatum Miller, N. A. Geol. Pal., 1889, p. 204 (gen. ref.). Lambe, 



Cont. Can. Pal., Geol. Surv. Canada, 4, pt. 2, 1901, p. 112. 

 Richmond (English Head, Charleton) : Charleton Point, West End, etc., Anticosti. 



Streptelasma (Petraia?) apertum (Billings). 



Petraia aperta Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 102, fig. 89a, b 



(Adv. sheets, 1862). Lambe, Cont. Can. Pal., Geol. Surv. Canada, 4, pt. 2, 



1901, p. 105. 



Streptelasma apertum Miller, N. A. Geol. Pal., 1889, p. 204 (gen. ref.). 

 Black River (Leray) : Pauquettes Rapids, Ottawa River, Canada. 



STREPTELASMA (DUNCANELLA) BOREALIS Hall. See Duncanella borealis. 



Streptelasma breve Winchell and Schuchert. 



Streptelasma breve Winchell and Schuchert, Geol. Minnesota, 3, pt. 1, 1895, 



p. 92, fig. 7. 



Black River (Platteville): Near Fountain, Minnesota. 

 Cotypes,C&t. No. 42538, U.S.N.M. 



STREPTELASMA CALIGULA var. GEOMETRICUS Foerste. See Enterolasma geometricum. 

 STREPTELASMA (ENTEROLASMA) CALICULUM Hall. See Enterolasma caliculum. 



Streptelasma conulus Rominger. 



Streptelasma conulus Rominger, Geol. Surv. Michigan, 3, pt. 2, 1876, p. 144, pi. 39, 



fig. 4. 

 Zaphrentis conulus Davis, Kentucky Fossil Corals, Geol. Surv. Kentucky, pt. 2, 



1885, pi. 133, figs. 12-14. 

 Niagaran: Drummond's Island, Lake Huron; Louisville, Kentucky (Louisville). 



Streptelasma corniculum Hall. 



Streptoplasma corniculum Hall, Pal. New York, 1, p. 69, pi. 25, figs. la-e. 



Streptelasma corniculum Edwards and Haime, Mon. d. Polyp. Foss. d. Terr. 

 Pal., 1851 (Arch, du Mus. d'Hist. Nat., 5), p. 398, pi. 7, figs. 4-4b (figures 

 probably refer to S. rusticum). Billings, Canadian Nat. Geol., 1, 1856, 



