288 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



POSTERULA SARSn Smitt, 1867 



Plate 31, figs. 1, 2 



1889. Escharoides sarsi Jelly, A synonymic Catalogue of Marine Bryozoa, p. 91. 



1900. Escharoides sarsii Nordgaard, Polyzoa, Den Norske Nordhavs Expedi- 

 tion, Zoology No. 27, vol. 27, p. 12. 



1903. Posterula sarsii Jullien, Bryozoaires de I'Hirondelle, Resultats des Cam- 

 pagnes scientifiques du Prince de Monaco, fasc. 23, pp. 89, 145, pi. 11, 

 fig. 4 (bibliography and operculum). 



1905. Escharopsis (Escharoides) sarsi Nordgaard, Hydrographical and biological 

 investigations in Norwegian fiords, Bergen Museum, p. 169. 



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Fig. 119. — Genus Posterula Jullien, 1903 



A- J. Posterula sarsi Smitt, 1868. A. Frontal face of portion of a colony, 

 X25. B. Operculum in place with its chitinous nucleus enveloped by the oper- 

 cular membrane. C. Operculum isolated. D. Peristomice with its avicularia. 

 (A-D. After Jullien, 1903.) E. Mandible, X250. F. Operculum, X85. G. 

 Mandible, X250. (E-G. After Waters, 1900.) H. Ovicelled zooecia, X25. 

 The ovicells show a more or less well-developed ovicellarian area (after Levinsen, 

 1909). I. Longitudinal section, X25, through an ovicelled zoarium. The 

 ovicell is hyperstomial, closed by the operculum, embedded in the tubular wall 

 of the distal zooecium. J. Longitudinal section through a thick colony, X25, 

 showing the arrangement of the tubules. 



1908. Escharoides sarsi Robertson, The incrusting Chilostomatous Bryozoa of 



the west coast of North America, University of California Publications 

 Zoology, vol. 4, p. 301, pi. 22, fig. 66, 67. 



1909. Discopora sarsii Levinsen, Morphologic and Systematic Studies on the 



Cheilostomatous Bryozoa, p. 344, pi. 24, fig. 2 (ovicell). 

 1912. Discopora sarsi Nordgaard, Bryozoaires de la Campagne arctique de 1907 

 de Due d'Orldans, p. 17. 



