330 AMEEICAN FOSSIL BRYOZOA. [bull. 173. 



NEMATAXIS Hall. Genotype: Nemataxis fibrosus Hall. 



1886. Nemataxis. Hall, Fifth Ann. Rep. State Geologist New York for the year 



1885, exjilanation jil. xxv. 



1887. Nemataxis. Hall and Simpson, Pal. New York, VI, p. xv. 

 1889. Nemataxis. Miller, North American Geol. Pal., p. 313. 



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

 for the year 1894, p. 552. 



Nemataxis fibrosus Hall. 



1886. Nemataxis fibrosus. Hall, Fifth Ann. Rep. State Geologist New York for 



the year 1885, pi. xxv, 30-36. 



1887. Nemataxis fibrosus. Hall and Simpson, Pal. New York, VI, p. 74, pi. xxv, 



30-36. 

 1897. Nemataxis fibrosus. Simpson, Fourteenth Ann. Rep. State Geologist New 

 York for the year 1894, pi. xvi, 15-18. 

 Upper Helderberg: Ontario, Canada. 



Nemataxis ? simplex Hall and Simpson. 



1887. Nemataxis simplex. Hall and Simpson, Pal. New York, VI, p. 193, pi. Ixvi, 



17-19. 

 Hamilton: Darien Center, New York. 



NEMATOPORA Ulrich. Genotype: Nematopora ovalis Ulrich. 



1888. Nematopora. Ulrich, American Geologist, I, p. 234. 



1889. Nematopora. Miller, North American Geol. Pal. , p. 313. 



1890. Nematopora. Ulrich, Geol. Sur. Illinois, VIII, pp. 401, 644. 

 1893. Nematopora. Ulrich, Geol. Minnesota, III, p. 204. 



1896. Nematopora. Ulrich, Zittel's Textb. Pal. ( Eng. ed. ) , p. 281. 



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



for the year 1894, p. 553. 



Nematopora alternata Ulrich. 



1890. Nematopora alternata. Ulrich, Geol. Sur. Illinois, VIII, p. 646, pi. xxix, 



8, 8n. 

 Trenton: Alexander Coimty, Illinois. 



Nematopora conferta Ulrich. 



1890. Nematopora conferta. Ulrich, Jour. Cincinnati Soc. Nat. Hist., XII, p. 198, 



fig. 22. 

 1893. Nematopora conferta. Ulrich, Geol. Minnesota, III, p. 206, pi. iii, 21-23. 

 Trenton : Cannon Falls, Minnesota. 



Nematopora delicatula Ulrich. 



1890. Nematopora delicatula. Ulrich, Geol. Sur. Ilhnois, VIII, p. 646, pi. xxix, 



11-116. 

 1893. Nematopora delicatula. Ulrich, Geol. Minnesota, III, p. 206, pi. iii, 26, 27. 

 1897. Nematopora delicatula. Simpson, Fourteenth Ann. Rep. State Geologist 

 New York for the year 1894, figs. 124, 125 (p. 553). 

 Trenton: Alexander County, Illinois; Cannon Falls, Minnesota. 



Nematopora formosa (Billings). 



1866. Helopora formosa. Billings, Catal. Sil. Foss. Anticosti, p. 37. 

 1890. Nematopora formosa. Ulrich, Geol. Sur. Illinois, VIII, p. 645. 



Anticosti: Anticosti Island. 



Obs. See also Helopora ? concava Billings. 



Nematopora fragilis Ulrich. 



1890. Nematopora fragihs. Ulrich, Geol. Sur. Illinois, VIII, p. 646, pi. xxix, 

 10-lOc. 

 Trenton: Alexander County, Illinois. 



