. Bulletin - United States National Museum. Science. Fig. 30.—Genus Hippaliosina Canu, 1918. A-C. Hippaliosina rostrigera Smitt, 1872. A. Ordinary zooecia. B. Group with an ovicelled zooecium. (A, B, after Smitt, 1872.) C. Interior of a fossil example, X 20. D. Hippaliosina sandbergeri Reuss, 1869. An ovicelled specimen, X 25, from the Aquitanian of Leognan, France. E-H. Hippaliosina brevirostris Canu, 1918. E. Ovicelled specimen, X 25. F. Operculum of the o\icelled zooecia, X 85. G. Operculum of ordinary zooecia, X 85. H. Areolar pores. X 85 (E-H after Waters, 1889.) to it. This latter specie
. Bulletin - United States National Museum. Science. Fig. 30.—Genus Hippaliosina Canu, 1918. A-C. Hippaliosina rostrigera Smitt, 1872. A. Ordinary zooecia. B. Group with an ovicelled zooecium. (A, B, after Smitt, 1872.) C. Interior of a fossil example, X 20. D. Hippaliosina sandbergeri Reuss, 1869. An ovicelled specimen, X 25, from the Aquitanian of Leognan, France. E-H. Hippaliosina brevirostris Canu, 1918. E. Ovicelled specimen, X 25. F. Operculum of the o\icelled zooecia, X 85. G. Operculum of ordinary zooecia, X 85. H. Areolar pores. X 85 (E-H after Waters, 1889.) to it. This latter species does not exist in the more southern European Pliocene. E. sandbergeri, not being able to emigrate toward the south probably by the obstacle of a continental barrier, was exterminated in its place. It is probable that it will be discovered in more northern Oligocene deposits. For the Southern Hemisphere this phenomenon is less evident because of the imperfect geographic conditions. .Uthough the fossil species H. laxipora has been. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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