366 CUMINGS AND GALLOWAY MORPHOLOGY OF TREPOSTOMATA 



lated to the diaphragms, and in some cases to the cystiphragms, and that 

 these massive deposits are probably best interpreted as senile characters. 



Acanthopores. — It is shown that in Dekayia the surface of the colony 

 was characterized by minute hollow spines, about the diameter of a hair 

 and extending two or three zocecial diameters above the surface. The 

 acanthopores are merely the submerged portions of these spines. The 

 function of the spines was undoubtedly protective. 



Media normani Kirkpatrick. — It is demonstrated by a study of wall 

 structure that Merita has no relation whatever to the Trepostomata. 



BlBLIOGRAPTIY 



1. R. S. Bassueb: The structural features of the Bryozoau genus Homotrypa, 



with descriptions of species from the Cincinnatian group. Proceedings 

 of the U. S. National Museum, volume xxvi, Washington, 1903, pp. 

 565-591. 



2. : A study of the James types of Ordoviciau and Silurian Bryozoa. 



Proceedings of the U. S. National Museum, volume xxx, Washington, 

 1906, pp. 1-66. 



3. : The Bryozoan fauna of the Rochester shale. Bulletin 292, U. S. 



Geological Survey, Washington, 1906. 



4. : The early Paleozoic Bryozoa of the Baltic provinces. Bulletin 77. 



United States National Museum, Washington, 1911. 



5. Louis Calvet: Contribution a I'Histoire Naturelle des Bryozoaires Ecto- 



proctes marin. Trav. Inst. Zool. Monti>ellier. N. S., memoire 8, Mont- 

 pellier, 1900. 



6. E. R. CuMiNGS : A revision of the Bryozoan genera Dekayia, Dekayella and 



Heterotrypa. American Geologist, volume xxix, Minneapolis, 1902, pp. 

 197-217. 



7. : The stratigraphy and paleontology of the Cincinnati series of In- 

 diana. Thirty-second Annual Iteport of the Department of Geology and 

 Natural Resources of Indiana, Indianapolis, 1908, ])p. 607-1189. 



8. : Development and systematic position of the Monticuliporoids. Bul- 

 letin of the Geological Society of America, volume xxiii, Washington, 

 1912, pp. .357-370. 



9- and J. .J. Galloway: A note on the Batostomas of the Richmond 



series. I'roceedings of the Indiana Academy of Science for 1911. In- 

 dianapolis, 1912, pp. 147-160. 



10. : The stratigraphy and paleontology of the Tanner's Creek sec- 

 tion of the Cincinnati series of Indiana. Thirty-seventh Annual Report 

 of the Department of Geology and Natural Resources of Indiana. In- 

 dianapolis. 191.3, pp. 353^78. 



11. J. W. Gkegouy : Catalogue of the fossil Bryozoa in the Department of 

 Geologj- of the British Museum (Natural History). The Cretaceous 

 Bryozoa. London, 2 volumes, 1899, 1909. 



