162 AMERICAN FOSSIL BRYOZOA. [bull.173. 



Acanthoclema alternatum (Hall)^ — Continued. 



1897. Acanthoclema alternatum. Simpson, Fourteenth Ann. Rep. State Geolo- 

 gist New York for the year 1894, pi. xvi, 6, 7. 

 Upper Helderberg: Onondaga Valley, New York. 

 Acanthoclema bispinulatum Miller. See Orthopora bispinulata (Hall). 



Acanthoclema confluens (Ulrich). 



1888. Rhombopora confluens. Ulrich, Bull. Denison Univ., IV, p. 91, pi. xiv, 17. 

 1890. Acanthoclema confluens, Ulrich. Geol. Surv. Illinois, VIII, p. 662, pi. 



Ixx, 5-56. 

 Waverly: Lodi, Ohio. 

 Keokuk: Nauvoo, Illinois. 



Acanthoclema divergens Hall and Simpson. 



1883. Trematopora? sp. indt. Hall, Rep. State Geologist New York for the year 



1882, pi. XXV, 2. 

 1887. Acanthoclema divergens. Hall and Simpson, Pal. New York, VI, p. 73, 



pi. xxviii, 2. 

 Upper Helderberg: Onondaga Valley, New York. 



Acanthoclema Hamiltonense Hall and Simpson. See Streblotrypa 

 hamiltonensis (Nicholson). 



Acanthoclema ovatum Hall and Simpson. 



1883. Trematopora? sp.indt. Hall, Rep. State Geologist New York for the year 



1882, pi. XXV, 3. 

 1887. Acanthoclema ovatum. Hall and Simpson, Pal. New York, VI, p. 73, pi. 

 xxviii, 3. 

 Upper Helderberg: Onondaga Valley, New York. 



Acanthoclema scutulatum Hall and Simpson. See Streblotrypa scutu- 

 lata (Hall) and Rhombopora reticulata (Hall). 



Acanthoclema sulcatum Hall and Simpson. 



1887. Acanthoclema sulcatum. Hall and Simpson, Pal. New York, VI, p. 192, 

 pi. Iv. 7, pi. Ivi. 7. 

 Hamilton: Near Canandaigua Lake, New York. 



Acanthoclema triseriale (Hall). 



1883. Stictopora? triserialis. Hall, Rep. State Geologist New York for the year 



1882, pi. XXV, 6, 7. 

 1887. Acanthoclema triseriale. Hall and Simpson, Pal. New York, VI, p. 74, pi. 

 xxviii, 6, 7. 

 Upper Helderberg: Near Caledonia, New York. 



ACROGENIA Hall. Genotype: Acrogenia prolifera Hall. 



1883. Acrogenia. Hall,Trans. Albany Institute, X, p. 193 (abstract, 1881, p. 193). 



1884. Acrogenia. Hall, Rep. State Geologist New York for the year 1883, p. 51, 

 1887. Acrogenia. Hall and Simpson, Pal. New York, VI, p. xx. 



1889. Acrogenia. Miller, North American Geol. Pal., p. 291. 



1890. Acrogenia. Ulrich, Geol. Surv. Illinois, VIII, p. 388. 



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



for the year 1894, p. 544. 

 1899. Acrogenia. Grabau, Bull. Buffalo Acad. Nat. Sci., VI, p. 175. 



Acrogenia prolifera Hall. 



1883. Acrogenia prolifera. Hall, Trans. Albany Institute, X, p. 194 (abstract, 

 1881, p. 194). 



