34 ILLINOIS STATE GEOLOGICAL SURVEY CIRCULAR 326 



Distribution. — All localities, except 3. 



Types. — Hypotypes, Illinois State Geological Survey, 12P19, 12P50, 12P53, 

 12P57, 12P60, 12P62, 12P63, 12P76, 12P77, 12P78, 12P79, 12P80, 12P81, 12P82, 

 12P84, 12P85, 12P86, 12P98, 12P99, 12P100, 12P101, 12P112. 12P113, 12P114, 

 12P115, 12P116, 12P181, 12P182, 12P184, 12P187, 12P200, 12P201, 12P203, 

 12P209, 12P212, 12P221, 12P225, 12P236, 12P237, 12P238, 12P239, 12P240. 



REFERENCES 



Agnew, A. F., Heyl, A. V., Jr., Behre, C. H., Jr., Lyons, E. J., 1956, Strati- 

 graphy of middle Ordovician rocks in the zinc-lead district of Wisconsin, 

 Illinois, and Iowa: U. S. Geol. Survey Prof. Paper 274-K, p. 251-334. 



Bassler, R. S., 1903, The structural features of the bryozoan genus Homo try pa , 



with descriptions of species from the Cincinnatian Group: U.S. Nat. Mus. 

 Proc, v. 26, no. 1323, p. 565-591, pis. 20-25. 



Bassler, R. S., 1911, The early Paleozoic Bryozoa of the Baltic provinces: U.S. 

 Nat. Mus. Bull. 77, 382 p., 13 pis. 



Bassler, R. S., 1932, The stratigraphy of the Central Basin of Tennessee: Tennes- 

 see Div. Geol. Bull. 38, 268 p., 49 pis. 



Bassler, R. S., 1933, Development of invertebrate paleontology in America: Geol. 

 Soc. America Bull., v. 44, pt. 2, p. 265-286. 



Bassler, R. S., 1953, Bryozoa, Pt . G, Treatise on invertebrate paleontology 



[R. C. Moore, ed.]: Geol. Soc. America and Univ. Kansas Press, Lawrence, 

 Kansas, 253 p. 



Bays, C. A., and Raasch, G. O., 1935, Mohawkian relations in Wisconsin: 

 Kansas Geol. Soc. 9th Ann. Field Conf. Guidebook, p. 296-301. 



Caley, J. F., 1936, The Ordovician of Manitoulin Island, Ontario: Geol. Survey 

 Canada Mem. 202, pt. 2, p. 21-90, 6 pis. 



Coryell, H. N., 1916, A study of the collections from the Trenton and Black River 

 Formations of New York: Indiana Acad . Sci . Proc, v. 31, p. 249-268. 



Coryell, H. N., 1921, Bryozoan faunas of the Stones River Group of central Ten- 

 nessee: Indiana Acad . Sci. Proc, v. 35, p. 261-340, 14 pis. 



Cumings, E. R., and Galloway, J. J., 1912, The stratigraphy and paleontology 

 of the Tanner's Creek section of the Cincinnati Series of Indiana: Indiana 

 Dept. Geol. Nat. Resources 37th Ann. Rept., p. 353-478, 20 pis. 



Cumings, E. R., and Galloway, J. J., 1915, Studies of the morphology and his- 

 tology of the Trepostomata or monticuliporoids: Geol. Soc. America Bull., 

 v. 26, p. 349-374, pis. 10-15. 



