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BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



the physiological standpoint this difference is insignificant because 

 it does not correspond to a different function; a simple rimule or 

 poster — it is always the entrance of the compensatrix. 



GALEOPSIS PUPA Jullien, 1903 



Plate 28, figs. 1, 2 



1903. Galeopsis pupa Jullien, Bryozoaires de V Hirondelle, Resultats Cam- 

 pagnes scientifiques du Prince de Monaco, fasc, 23, p. 95, pi. 12, fig. 1. 



Affinities. — In general our specimens are not as pretty as those 

 figured by Jullien; the presence of a large salient spiramen renders 

 the frontal very fragile when the polypide is dead. 



The operculum is very large and of variable dimensions; its margins 

 are strongly chitinized. The muscular insertions are large, removed 

 from the border and placed at the extremity of two lateral chitinous 

 bands. The general aspect is that of a Lepralia with a small poster 



D E F 



Fig. 111. — Opercula of Galeopsis, X85 



A. B. Galeopsis mutabilis, new species. Two forms of opercula. C-F. Gale- 

 opsis pupa Jullien, 1903. C. Operculum probably of zooecium with spiramen. 

 D. Operculum of probably ovicelled zooecium. E. Operculum of ovicelled zoo- 

 ecium. F. Operculum of zooecium probably without spiramen. 



and the operculum is almost identical with that of Gcj>lti/roj)hora 

 polymorpha Busk, 1885. It is therefore with reason that in 1923 we 

 placed the two genera in the same family. 



Biology. — The proximal border of the aperture is placed just at the 

 level of the orifice; this disposition facilitates the passage of the eggs, 

 the operculum closing the spiramen. 



The ectoeyst is very pale green; some zooecia have a clear rose 

 color. Our specimens were in full reproduction and fixation Febru- 

 ary 15, 1008. There are three kinds of opercula probably correspond- 

 ing to ovicelled zooecia, to zooecia with spiramen and to those without 

 spiramen. 



