172 AMEEICAN FOSSIL BRYOZOA. [bull. 173. 



Arthrostylus obliquus Ulrich. 



1890. ArthroHtylus obliquus. Ulrich, Jour. Cincinnati Soc. Nat. Hist., XII, 



p. 190, figs. 14o, d. 

 1893. Arthrostylus obliquus. Ulrich, Geol. Minnesota, III, p. 188, pi. iii, 15, 16. 

 Trenton (Stones River): Minneapolis, Minnesota. 



Arthrostylus tenuis (James). 



1878. Helopora tenuis. James, Paleontologist No. 1, p. 3. 



1882. Arthronema tenuis. Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 160, 



pi. vi, 8-8c. 

 1893. Arthrostylus tenuis. Ulrich, Geol. Minnesota, III, pi. iii, 16<?. 

 Trenton: Covington, Kentucky. 

 Cincinnati (Utica): Covington and Newport, Kentucky; Cincinnati, Ohio. 



ASCODICTYON Nicholson and Etheridge, Juu. Genotype: Ascodictvon 

 stellatuni Nicholson and Etheridg-e, Jun, 

 1877. Ascodictyon. Nicholson and Etheridge, Jun., Ann. Mag. Nat. Hist., ser. 



4, XIX, p. 463. 

 1882. Ascodictyon. Vine, Quar. Jour. Geol. Soc. London, XXXVIII, p. 52. 



1889. Ascodictyon. Miller, North American Geol. Pal., p. 293. 



1890. Ascodictyon. Ulrich, Geol. Surv. Illinois, VIII, p. 367. 



1897. Ascodictyon. Simp.son, Fourteenth Ann. Rep. State Geologist New York 

 for the year 1894, p. 603. 

 Obs. Ascodictyon fusiforme was the first species described, but, judging 

 from the generic description, the authors intended A. stellatum to be the 

 genotype. 



Ascodictyon fusiforme Nicholson and Etheridge, Jun. 



1877. Ascodictyon fusitorme, Nicholson and Etheridge, Jun., Ann. Mag. Nat. 

 Hist., ser. 4, XIX, p. 463, pi. xix, 7, 8. 

 Hamilton: Widder, Ontario; Alpena, Michigan. 



Ascodictyon stellatum Nicholson and Etheridge, Jun. 



1877. Ascodictyon stellatum. Nicholson and Etheridge, Jun., Ann. Mag. Nat. 

 Hist., ser. 4, XIX, p. 464, pi. xix, 1-6. 



1881. Ascodictyon stellatum. Vine, Quar. Jour. Geol. Soc. Loudon, XXXVII, 



p. 618. 



1891. Ascodictyon stellatum. Whiteaves, Contr. Canadian Pal., I, p. 213. 

 1893. Ascodictyon stellatum. Ulrich, Geol. Minnesota, III, p. 113, fig. 8a. 

 1897. Ascodictyon stellatum. Simpson, Fourteenth Ann. Rep. State Geologist 



New York for the year 1894, fig. 220 (p. 603). 

 Hamilton: Widder, Ontario; Eighteenmile Creek, New York. 



ASPIDOPORA Ulrich. Genotype: Aspidopora areolata Ulrich. 



1882. As])idopora. Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 155. 



1889. Aspidopora. Miller, North American Geol. Pal., p. 293. 



1890. Aspidopora. Ulrich, Geol. Surv. Illinois, VIII, p. 373. 



1893. Asjiidopora. Ulrich, Geol. Minnesota, III, p. 254. 



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

 for the year 1894, p. 584. 



Aspidopora areolata Ulrich. 



1883. Aspidopora areolata. Ulrich, Jour. Cincinnati Soc. Nat. Hist., VI, p. 164, 



pi. vii, 2-2c. 



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



XVI, p. 183. 

 Cincinnati (Utica): Cincinnati, Ohio. 



