294 . AMERICAN FOSSIL BEYOZOA. [bull. 178. 



Homotrypella instabilis Ulrieh. 



1886. Horaotfypella instabilis. Ulrieh, Fourteenth Ann. Rep. Geol. Nat. Hist. 



Sur. Minnesota, p. 83. 



1893. Homotrypella instabilis. Ulrieh, Geol. Minnesota, III, p. 229, pi. xviii, 

 9-20. 



1897. Homotrypella instabilis. Simpson, Fourteenth Ann. Rep. State Geologist 

 New York for the year 1894, figs. 168, 169 (p. 586). 

 Trenton (Black River): Minneapolis, St. Paul, Cannon Falls, and Foun- 

 tain, Minnesota. 



Homotrypella meeki Ulrieh. See Bythopora meeki (James). 



Homotrypella multiporata Ulrieh. 



1893. Homotrypella multiporata. Ulrieh, Geol. Minnesota, III, p. 230, pi. xviii, 

 21, 22. 

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



Homotrypella mundula Ulrieh. 



1893. Homotrypella mundula. Ulrieh, Geol. Minnesota, III, p. 232, fig. 12a-c. 



Trenton: Deeorah, Iowa; Cannon Falls, Minnesota; Frankfort, Kentucky. 



Homotrypella ? ovata Ulrieh. 



1893. Homotrypella ? ovata. Ulrieh, Geol. Minnesota, III, p. 231, pi. xviii, 

 23-30. 

 Trenton (Black River and Trenton): Cannon Falls and Minneapolis, 

 Minnesota. 



Homotrypella rustica Ulrieh. 



1893. Homotrypella rustiea. Ulrieh, Geol. Minnesota, III, p. 234, pi. xviii, 31-33. 



1896. Montieuliiiora (Fistulipora) rustiea. J. F. James, Jour. Cincinnati Soc. 



Nat. Hist, XVIII, p. 120. 

 Cincinnati (Richmond): Spring Valley, Minnesota. 



Homotrypella ? subgracilis Ulrieh. 



1893. Homotrypella ? subgracilis. Ulrieh, Geol. Minnesota, III, p. 230, pi. xxvi, 

 10-16. 

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

 Obs. This species may be a Bythopora. 



Hornera Lamouroux. Not a Paleozoie g-enus. 

 Hornera ? diehotoma Hall. See Thamniscus diehotomus (Hall). 

 HYPHASMOPORA Etheridge, Jun. Genotype: Hyphasmopora buskii 

 Etheridge, Jun., from the Carboniferous shales of Seotland. 

 1875. Hyphasmopora. Etheridge, Jun. , Ann. Mag. Nat. Hist. , ser. 4, XV, p. 43. 

 1889. Hyphasmopora. Vine, Proc. Yorkshire Geol. Polyt. Soe., XI, p. 188. 

 Obs. No American species have yet been referred to this genus. 



ICHTHYORACHIS MeCoy. Genotype: lehthyoraehis newenhami 



MeCoy. 



1844. lehthyoraehis. MeCoy, Syn. Carb. Foss. Ireland, p. 205. 



1887. lehthyoraehis. Hall and Simpson, Pal. New York, VI, p. xxv. ' 

 1889. lehthyoraehis. Miller, North American Geol. Pal., p. 310. 



1897. lehthyoraehis. Simpson, Fourteenth Ann. Rep. State Geologist New 



York for the year 1894, p. 524. 



lehthyoraehis nereis Hall. 



1874. I(-hthyoraehis Nereis. Hall, Twenty-sixth Ann. Rep. New York State 

 Museum, p. 98. 



