806 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



METOPTOMA— Continued. 



Geol. Snrv. Canada, 1862, p. 86.— Meek and Worthen, Proc. Acad. Nat. Sei. 

 Philadelphia, 1866, p. 266; Geol. Surv. Illinois, 3, 1868, p. 506.— Zittel, 

 Handb. Pal., 2, 1882, p. 176.— Koninek, Ann. d. Mus. Royal d'Hist. Nat. de 

 Belgique, 8, 1883, p. 187.— Koken, Neues Jahrb. Min. Geol. Pal., 6, Beilage- 

 Band, 1889, p. 422— Miller, N. A. Geol. Pal., 1889, p. 409— Koken, Die 

 Leitfossilien, Leipzig, 1896, p. 94, fig. 72, figs. 1, 2.— Berkey, Amer. Geol., 21, 

 1898, p. 278.— Pilsbry, Zittel-Eastman Textb. Pal., 1, 1900, p. 442. 

 Observation. — Although numerous species have been referred to Metoptomaby 

 American authors, it is probable that none of them possesses the essential features 

 of the genus. Metoptoma is apparently the European representative of the Ameri- 

 can Carboniferous genus Lepetopsis Whitfield . 



Metoptoma Billings, and other authors. See Archinacella Ulrich and Scofield, and 

 Triblidium Lindstrom. 



Metoptoma?? alceste Billings. 



Metoptoma Alceste Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 153, text 



figs. 133a, b (adv. sheets, 1862); Cat. Sil. Foss. Anticosti Geol. Surv. Canada, 



1866, p. 18. 

 Richmond (English Head): English Head, Anticosti. 



Metoptoma alta Whitfield. See Scenella? alta. 



Metoptoma? analoga Walcott. See Scenella analoga. 



Metoptoma?? augusta Billings. 



Metoptoma Augusta Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 88. 



(Adv. sheets, 1862.) 

 Ozarkian? (Levis-erratics): Point Levis, Quebec. 



Metoptoma?? anomala Billings. 



Metoptoma anomala Billings, Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 89, 



figs. 81a, b. (Adv. sheets, 1862.) 

 Ozarkian? (Levis-erratics): Point Levis, Quebec. 



Metoptoma Barabuensis Whitfield. See Tryblidium barabuense. 



Metoptoma billingsi Walcott. See Archinacella? billingsi. 



Metoptoma canadensis Miller. See Priscochiton canadensis. 



Metoptoma cornutaforme Walcott. See Tryblidium eornutaforme. 



Metoptoma deforMis Billings. See Archinacella deformata. 



Metoptoma dubia Hall. See Archinacella deformata. 



Metoptoma Erato Billings. See Tryblidium erato. 



Metoptoma Estella Billings. See Archinacella estella'. 



Metoptoma Eubule Billings. See Tryblidium eubule. 



Metoptoma explanata Sardeson. See Archinacella perovalis. 



Metoptoma Hyrie Billings. See Tryblidium hyrie. 



Metoptoma instabilis Billings. See Archinacella instabilis. 



