170 AMERICAN FOSSIL BRYOZOA. [bull. 173 



Arthroclema armatum Ulrich — Continued. 



1897. Arthroclema armatum. Simpson, Fourteenth Ann. Rep. State Geologist 

 New York for the year 1894, fig. Ill (p. 547). 

 Trenton : Cannon Falls and St. Paul, Minnesota. 



Arthroclema billingsi Ulrich. 



1890. Arthroclema billingsi. Ulrich, Geol. Surv. Illinois, VIII, p. 642. 

 1893. Arthroclema billingsi. Ulrich, Geol. Minnesota, III, p. 197, pi. ii, 7. 

 1897. Arthroclema Billingsi. Simpson, Fourteenth Ann. Rep. State Geologist 

 New York for the year 1894, tig. 105 (p. 547). 

 Trenton: Ottawa, Canada. 



Arthroclema cornutum Ulrich. 



1890. Arthroclema cornutum. Ulrich, Jour. Cincinnati Soc. Nat. Hist., XII, 



p. 193, fig. 18. 

 1893. Arthroclema cornutum. Ulrich, Geol. Minnesota, III, p. 200, pi. ii, 16-21, 



23, pi. iii, 34. 

 1897. Arthroclema cornutum. Simpson, Fourteenth Ann. Rep. State Geologist 



New York for the year 1894, figs. 106-108, 112 (p. 547). 

 Trenton (Black River): Minneapolis, Minnesota. 



Arthroclema pulchellum Billings. 



1862. Arthroclema pulchellum. Billings, Pal. Foss., I, p. 54, fig. 60. 



1890. Arthroclema pulchellum. Ulrich, Geol. Surv. Illinois, VIII, p. 642, pi. 



xxix, 6c. 

 1893. Arthroclema pulchellum. Ulrich, Geol. Minnesota, III, pi. ii, 12-15. ' 

 1890. Arthroclema armatum (in part). Ulrich, Jour. Cincinnati Soc. Nat. 

 Hist, XII, p. 194, fig. 19 e-h (not 19 a-d). 

 Trenton: Ottawa City and Peterboro, Canada. 



Arthroclema spiniforme Ulrich. See Helopora spiniformis (Ulrich). 



Arthroclema striatum Ulrich. 



1893. Arthroclema striatum. Ulrich, Geol. Minn., Ill, p. 198, pi. ii, 22,24, 



pi. iii, 28-33. 

 1897. Arthroclema striatum. Simpson, Fourteenth Ann. Rep. State Geologist 



New York for the year 1894, figs. 109, 110 (p. 547). 

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



Arthronema Ulrich (preoccupied). See Arthrostylus Ulrich. 



Arthronema curtum Ulrich. See Arthrostylus curtus (Ulrich). 



Arthronema tenue Ulrich. See Arthrostylus tenuis (James). 



ARTHROPORA Ulrich. Genotype: Ptilodictya (Stictopora) Shafferi 



Meek. 



1882. Arthropora. Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, pp. 152, 167. 



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



1890. Arthropora. Ulrich, Geol. Surv. Illinois, VIII, p. 393. 

 1893. Arthropora. Ulrich, Geol. Minnesota, III, p. 176. 



1896. Arthropora. Ulrich, Zittel's Textb. Pal. (Engl. ed. ), p. 279. 



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



for the year 1894, p. 605. 



Arthropora bifurcata Ulrich. 



1893. Arthropora bifurcata. Ulrich, Geol. Minnesota, III, p. 178, pi. xiv, 22-25. 

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



Arthropora reversa Ulrich. 



1893. Arthropora reversa. Ulrich, Geol. Minnesota, III, p. 178, pi. xiv, 26. 

 Trenton: St. Paul, Minnesota. 



