1338 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Zittelella typicalis Ulrich and Everett. 



Zittelella typicalis Ulrich and Everett, Geol. Surv. Illinois, 8, 1890, p. 268, pi. 5, 



figs. 3, 3a-c, 5, 5a. 



Black River (Platteville) : Near Dixon, Illinois. 

 Figured sections of cotype. Cat. No. 46576, U.S.N.M. 



Zittelella typicalis pistilliformis Ulrich and Everett. 



Zittelella typicalia var. pistilliformis Ulrich and Everett, Geol. Surv. Illinois, 8, 



1890, p. 269, pi. 5, fig. 4. 

 Black River (Platteville) : Near Dixon, Illinois. 



Zittelella typicalis subrotunda Ulrich and Everett. 



Zittelella typicalis var. subrotunda Ulrich and Everett, Geol. Surv. Illinois, 8, 



1890, p. 269, pi. 5, figs. 2, 2a. 

 Black River (Platteville): Near Dixon, Illinois. 



Zittelella typicalis turbinata Ulrich and Everett. 



Zittelella typicalis var. turbinata Ulrich and Everett, Geol. Surv. Illinois, 8, 



1890, p. 269, pi. 5, figs. 7, 7a. 

 Black River (Platteville): Near Dixon, Illinois. 



Zittelella varians (Billings). 



Eospongia varians Billings, Geol. Vermont, 2, 1861, p. 956; Rep. Econ. Geol., 



etc., Vermont, 1862, p. 228; Pal. Foss., 1, Geol. Surv. Canada, 1865, p. 19 



(adv. sheets, 1861). 

 Zittelella varians Schuchert and Twenhofel, Bull. Geol. Soc. Amer., 21, 1910, 



p. 690. 

 Chazyan: Mingan Islands, Canada (Mingan); East Tennessee (Lenoir). 



ZITTELOCERAS Hyatt. Genotype: Cyrtoceras lamellosum Hall. 



Zitteloceras Hyatt, Proc. Boston Soc. Nat. Hist., 22, 1884, p. 284; Zittel-Eastman 

 Textb. Pal., 1, 1900, p. 522; 2d ed., 1913, p. 603. Grabau and Shimer, N. A. 

 Index Fossils, 2, 1910, p. 76. 



Zitteloceras billingsi (Salter). 



Cyrtoceras billingsi Salter, Geol. Surv. Canada, Canad. Org. Rem., dec. 1, 

 1859, p. 33, pi. 7, fig. 6 (not 5= Zitteloceras hallianum). Clarke, Geol. Min- 

 nesota, Pal., 3, pt. 2, 1897, p. 806, pi. 60, fig. 10. 



Zitteloceras billingsi Grabau arid Shimer, N. A. Index Fossils, 2, 1910, p. 76. 



Black River: Allumette Island, Ottawa River, Canada (Leray); Cannon Falls, 

 Minnesota (Platteville); Lincoln County, Missouri (Auburn). 



Zitteloceras hallianum (D'Orbigny). 



Cyrtoceras lamellosum Hall (not Verneuil, 1842), Pal. New York, 1, 1847, p. 93, 

 pi. 41, figs. 2a-c. 



Cyrtoceras billingsi Salter, Geol. Surv. Canada, Can. Org. Rem., dec. 1, 1859, 

 p. 33, pi. 7, fig. 5 (not 6 = Zitteloceras billingsi). 



Cyrtoceras Hallianus D'Orbigny, Prodr. Pal., 1, 3849, p. 1. Clarke, Geol. Minne- 

 sota, 3, pt. 2, 1897, p. 805, pi. 60, figs. 11, 12. Cumings, 32d Ann. Rep. Dep. 

 Geol. Nat. Res. Indiana, 1908, p. 1028. 



Zitteloceras hallianum Ruedemann, Bull. New York State Mus. ; 49, 1901, p. 41. 

 Grabau and Shimer, N. A. Index Fossils, 2, 1910, p. 76, fig. 1291. 



Trenton: Middleville, etc., New York; Canada. 



Black River: Janesville, Wisconsin (Platteville); Minneapolis, Minnesota (De- 

 corah). 



