THE MORPHOLOGY OF THE OHEILOSTOMATA . 341 



f8) The results of the study of the couipensatioii-sac and 

 frontal surface generally are confirmed by an examination of 

 the primary zoa^cium or "ancestrula" (Jullieu). 



(9) Two new species (Eutliyris clathrata and Lepralia 

 liaddoni) are described, and a new genus (Euthy roides) 

 is suggested for Eutliyris episcopalis, Busk. 



(10) The operculuui of E. clathrata is of a specially 

 complicated type. The vestibule, or first part of the introvert, 

 is provided Avith a chitinous distal lip, for which the name 

 "labium " is suggested. 



VIII. Literature.^ 



1877. Bakrois, J. — "Recli. Emljijol. Bryozoaires," 'Tiav. Inst. Lille,' i. 

 1852. Busk, G.—' Cat. Marine Polyzoa . . . Brit. Mus.,' part 1. 

 1884. Busk, G. — ' Beport on the Polyzoa," I, ' Challenger Reports,' part 80. 

 1900. Calyet, L. — " Cont. Hist. Nat. Brjozoaires Eclojjroctes Marios," 



' Trav. Inst. Zool. Montpellier ' (N. S.), Mem. S. 

 1900. Canu, V. — "Rev. Brjozoaires du Cretace figures par D'Orbigny : 



11, Cheilostoniata," ' Bull. Soc. Geo!. France ' (3), xxviii, p. 33'1. 

 1880. Goldstein, J. R. Y.—" Notes on Living Polyzoa," ' Journ. Micr. Soc. 



Victoria,' i, ]). 42. 



lS9o. Gregory, J. W. — "British Palseogene Brjozoa," "Trans. Zool. Soc.,' 

 xiii, 1S95, p. 219. 



1S96. Gregory, J. W. — "Cat. Foss. Bryozoa in the Brilish Museuu)," 

 ' Jurassic Bryozoa.' 



1892. Harmee, S. F\ — "Excretory Processes Marine Polyzoa," 'Quart. 

 Journ. Micr. Sci.,' xxxiii, p. 123. 



1900. Harmlr, S. F.— "Rev. Genus Steganoporella," 'Qiiait. Journ. 



Micr. Sci.,' xliii, p. 225. 



1901. Harmer, S. F. — "Struct. Class. Cheilobtonialous Polyzoa," ' Proc. 



Cambridge Phil. Soc.,' xi, p. 11. 

 1880. HiNCKs, T.— ' Hist. Brit. Marine Polyzoa.' 

 1889. Jelly, E. C. — ' Syu. Cat. Recent Marine Bryozoa.' 

 18SG. Jullien, J. — " Les Coslulidees, nouvclle Farnille de Bryozoaires," 



' Bull. Soc. Zool. France,' xi, p. GO. 



' Many of the references are given as foot-notes. 



