NICK LES AND BASSLER.] CATALOGUE OF GENERA AND SPECIES. 283 



Heliotrypa bifolia Ulrich, 



1883. I leliotryjia bifolia. Ulricli, Jour. Cincinnati Soc. Nat. Hist., VI, j). 278, 

 pi. xiii, 6-(k\ 



1889. Heliotrypa bifolia. Miller, North American Geol. Pal., fig. 484 (p. 308). 



1890. Heliotrypa bifolia. Ulrich, Geol. 8urv., Illinois, VIII, fig. 3/(p. 308). 

 Chester: Sloans Valley, Kentucky. 



Hellipora antheloidoa Roming'er. In error for Stellipora antheloidea. 

 See Coiistellaria constellata (Van Cleve) Dana. 



HELOPORA Hall. Genotype: Helopora fragilis Hall. 



1852. Helopora. Hall, Pal. New York, II, p. 44. 



186(>. Helopora. Billings, Catal. Si 1. Foss. Anticosti, p. 36. 



1888. Helopora. Ulrich, American Geologist, I, p. 231. 



1889. Helopora. Miller, North American Geol. Pal., p. 308. 



1890. Helopora. Ulrich, Geol. Surv. Illinois, VIII, pp. 401, 642. 

 1890. Helopora. Ulrich, Jour. Cincinnati Soc. Nat. Hist., XII, p. 191. 

 1893. Helopora. Ulrich, Geol. Minnesota, III, p. 189. 



1896. Helopora. Ulrich, Zittel's Textb. Pal. (Engl, ed.), p. 280. 



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



for the year 1894, p. 548. 



Helopora alternata Ulrich. 



1890. Helopora alternata. Ulrich, Jour. Cincinnati Soc. Nat. Hist., XII, p. 192, 



fig. 16/. 

 1893. Helopora alternata. Ulrich, Geol. Minnesota, III, p. 192, pi. iii, 9. 

 Trenton (Black River) : INIinneapolis, Minnesota. 



Helopora approximata James. See Bythopora parvula (James). 



Helopora armata Billing-s. 



1866. Helopora armata. Billings, Catal. Sil. Foss. Anticosti, p. 38. 

 Anticosti: Anticosti Island. 



Helopora bellula Billings. 



1866. Helopora bellula. Billings, Catal. Sil. Foss. Anticosti, p. 38. 

 Anticosti: Anticosti Island. 



Obs. Compare Helopora fragilis Hall, of which this species may be a 

 synonym. 



Helopora ?? circe Billings. 



1866. Helopora Circe. Billings, Catal. Sil. Foss. Anticosti, p. 39. 

 Anticosti: Anticosti Island. 



Helopora ?? concava Billings. 



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

 Anticosti: Anticosti Island. 

 Obs. This form may be only aconditionof Nematopora formosa (Billings). 



Helopora dendrina James. See Bythopora dendrina (James). 



Helopora divaricata Ulrich. 



1886. Helopora divaricata. Ulrich, Fourteenth Ann. Rep. Geol. Nat. Ilist. Surv. 



Minnesota, p. 59. 

 1893. Helopora divaricata. Ulrich, Geol. Minnesota, HI, j). U»l, pi. iii, 1-3. 

 Trenton (Stones River): Minneapolis, Minnesota. 



Helopora elegans Ulrich. 



1893. Helopora elegans. Ulrich, Geol. Minnesota, III, p. 194, fig. 11. 



Cincinnati (Richmond): Blanchester, Oxford, and other localities in Ohio; 

 Richmond and Versailles, Indiana. 



