314 AMERICAN FOSSIL BRYOZOA. [bull. 173. 



MONOTRYPA Nicholson. Genotype: Chaetetes imdulatus Nicholson. 



1879. Monotrypa. Nicholson, Paleozoic Tabulate Corals, p. 293. 



1881. Monotrypa. Nicholson, Genus Monticulipora, pp. 102, 168. 



1882. Monotrypa. Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 153. 



1883. Monotrypa. Foord, Contr. Micro-Pal. Cambro-Sil., p. 14. 



1886. Monotrypa. Waagen and Wentzel, Pal. Indica, Ser. XIII, 875, 876. 



1887. Monotrypa. Hall and Simpson, Pal. New York, VI, p. xiii. 



1889. Monotrypa. Miller, North American Geol. Pal., p. 196. 



1890. Monotrypa. Ulrich, Geol. Surv. Illinois, YIII, p. 379. 

 1893. Monotrypa. Ulrich, Geol. Minnesota, III, p. 303. 



1896. Monotrypa (in part). Zittel's Textb. Pal. (Engl. ed. ), p. 104. 



1897. Monotrypa. Ulrich, Zittel's Textb. Pal. (Engl. ed. ), p. 275. 



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



for the year 1894, p. 581. 

 1899. Monotrypa. Grabau, Bull. Buffalo Soc. Nat. Sci., VI, p. 136. 

 1887. Ptychonema. Hall and Simpson, Pal. New York, VI, pp. xiv, 14. 

 1889. Ptychonema. Miller, North American Geol. Pal. , p. 201. 

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



for the year 1894, p. 583. 



Monotrypa ? amplectens Grabau. 



1899. Monotrypa amplectens. Grabau, Bull. Buffalo Soc. Nat. Sci., VI, p. 137, 

 fig. 22. 

 Hamilton: Averys Creek, Erie County, New York. 



Monotrypa colliculata (Hall). 



1879. Chsetetes coUiculatus. Hall, Thirty-second Ann. Rep. New York State 



Museum, p. 148 (reprint, 1880, p. 10). 

 1883. Chgetetes coUiculatus. Hall, Rep. State Geologist New York for the year 



1882, pi. viii, 1-4. 

 1887. Chaetetes coUiculatus. Hall and Simpson, Pal. New York, VI, p. 11, pi. 



viii, 1-4. 

 1893. Monotrypa colliculata. Ulrich, Geol. Minnesota, III, p. 304. 

 Lower Helderberg: Schoharie, New York. 



Monotrypa (Chsetetes ?) cumulata Ulrich. 



1893. Monotrypa (Chsetetes ?) cumulata. Ulrich, Geol. Minnesota, III, p. 307, 

 pi. xxvii, 26, 27. 

 Trenton: Goodhue County, Minnesota; Ottawa, Canada. 



Monotrypa ? filiasa Ulrich. See Amplexopora filiosa (D'Orbigny). 



Monotrypa friiticosa Grabau. See Chaetetes fruticosus Hall (Ham- 

 ilton). 



Monotrypa ? furcata Grabau, See Chaetetes furcatus Hall. 



Monotrypa 1 helderbergiae (Hall). 



1874. ('hjetetes Helderbergije. Hall, Twenty-sixth Ann. Rep. New York State 



Museum, p. 110. 

 1883. Chaetetes Helderbergiae. Hall, Rep. State Geologist New York for the 



year 1882, pi. ix 16, 17. 

 1887. Ptychonema Helderbergite. Hall and Simpson, Pal. New York, VI, p. 



15, pi. ix, 16, 17. 

 1879. Favositea inexpectans. Hall, Thirty-second Aim. Rep. New York State 



Museum, p. 146 (reprint, 1880, p. 8). 

 Lower Helderberg: Clarksville and Schoharie, New York. 



