NicKLEs AND BAssLER.] CATALOGUE OF GENERA AND SPECIES. 285 



Helopora quadrata Ulrich. 



1893. Helopora quadrata. Ulrich, Geol. Minnesota, III, p. 193, fig. 10. 

 Trenton: Cannon Falls, Minnesota. 



Helopora spiniformis (Ulrich). 



1881.'. Artlirocleina Hpiniformis. Ulrich, Jour. Cincinnati Soc. Nat. llisst., V, p. 



161, pi. vi, 10, 10a. 

 1893. Helopora spiniformis. Ulrich, Geol. Minnesota, III, pi. iii, 4, 5, 6. 

 1896. Helopora spiniformis. Ulrich, Zittel's Texth. Pal. (Engl, ed.), fig. 469 



(p. 283). 

 Trenton (Stones River): Lebanon and Lavergne, Tennessee; Dixon, 



Illinois. 



Helopora striatopora Billings, See Nematopora striatopora (Billings). 

 Helopora strigosa Billings. See Nematopora strigosa (Billings). 

 Helopora tenuis James. See Arthrostylus tenuis (James). 



Helopora ?? varipora Billings. 



1866. Helopora varipora. Billings, Catal. Sil. Foss. Anticosti, i>. 40. 

 Anticosti: Anticosti Island. 



HEMIPHRAGMA Ulrich. Genotype: Batostoma irrasuni Ulrich. 

 1890. Batostoma (in part). Ulrich, Geol. Sur. Illinois, VIII, p. 379. 

 1893. Hemiphragma. Ulrich, Geol. Minnesota, III, p. 299. 



1896. Hemiphragma. Ulrich, Zittel's Textb. Pal. (Engl. ed. ), p. 275. 



1897. Hemiphragma. Simpson, Fourteenth Ann. Rep. State Geologist New York 



for the year 1894, p. 592. 



Hemiphragma imperfectum (Ulrich). 



1890. Batostoma imperfectum. Ulrich, Geol. Sur. Illinois, VIII, p. 460, pi. xxxv 

 3-3(/. 



1893. Hemiphragma imperfectum. Ulrich, Geol. Minnesota, III, p. 301. 



1894. Monticulipora imperfectum. J. F. James, Jour. Cincinnati Soc. Nat. Hist. , 



XVI, p. 196. 

 Cincinnati (Richmond): Wilmington, Illinois. 



Hemiphragma irrasum (Ulrich). 



1886. Batostoma irrasa. Ulrich, Fourteenth Ann. Rep. Geol. Nat. Hist. Sur. Min- 

 nesota, p. 94. 

 1893. Hemiphragma irrasum. Ulrich, Geol. Minnesota, III, p. 299, pi. xxiv, 5-19. 



1896. Hemiphragma irrasum. Ulrich, Zittel's Textb. Pal. (Engl, ed.), fig 460 



(p. 275). 



1897. Hemiphragma irrasum. Simpson, Fourteenth Ann. Rep. State Geologist 



New York for the year 1894, figs. 190-193 (p. 592). 

 Trenton (Stones River, Black River, and Trenton): Minneapolis, St. Paul, 

 Cannon Falls, and Preston, Minnesota; Decorah, Iowa. 



Hemiphragma ottawense (Foord). 



1883. Batostoma Ottawaense. Foord, Contr. Micro-Pal. Cambro-Sil., p. 18 pi ii 



1-1/. 

 1893. Hemiphragma ottawaense. Ulrich, Geol. Minnesota, III, p. 300, pi. xxiv, 



1-4. 

 Trenton (Black River and Trenton): Ottawa and Paquettes Rapids, Ottawa 



River, Canada; Kenyon, Berne, and Mantorville, Minnesota. 



Hemiphragma tenuimurale Ulrich. 



1893. Hemiphragma tenuimurale. Ulrich, Geol. Minnesota, III, p. 301, '>1. xxiv, 

 20-23. 

 Trenton: Goodhue Countv, Minnesota. 



