1910] Robertson: Cyclostomatous Bryozoa. 241 



colony depending upon whether or not the growing edge gr. < d. I 



or limiting membrane remains intact. In well-formed colonies 

 the sides may bend so far outward and downward as to inclose 

 the circular disk, which then becomes the center approximately 

 of a large circular colony (fig. 26). In some species the colony 

 may become erect and take on an Idmonea-like form. Ocecia 

 are usually abundant on well- formed colonies and in the four 

 species reported here the ocecial opening is distinctive. 



KEY TO THE SPECIES OP TUBULIPORA. 



1. Zoarium directly actuate, circular, or flabelliform, or lobed 2 



1. Zoarium not directly actuate, but adherent by dorsal teeth, lobed 8 



2. Tube of oceeiostome long 3 



2. Tube of oceeiostome short 6 



3. Tube of oceeiostome bent, often at right angles 4 



3. Tube of oceeiostome straight, or slightly inclined 5 



4. Oceciopore compressed, smaller than aperture of ocecium 



T. flabellaris. 



5. Oceciopore compressed, its long diameter greater than the diameter 



of the oceeiostome T. occidentalis 



6. Oceeiostome opening at right angles to ocecial wall 7 



6. Oceeiostome not opening at right angles to ocecial wall 8 



7. Oceciopore circular, compressed or flaring widely, funnel-shaped, 



its diameter twice that of a zoceeium T. pacifica. 



8. Oceciopore circular or compressed, only slightly, if at all, larger 



than the diameter of a zoceeium T. pulchra. 



92. Tubulipora flabellaris Pabricius. 



PI. 21, figs. 25, 26. 



Tubipora flabellaris Pabricius, 1780, p. 430. 

 Tubulipora flabellaris, Smitt, 1866, p. 401, pi. 9, fig. 6. 

 Tubulipora flabellaris, Harmer, 1898, p. 99, pi. 8, fig. 4. 



Zoarium adnate. more or less fan-shaped, or circular in form 

 in well-developed colonies. Zooecia sub-erect, single, free, or in 

 connate series two, three, or four in a single or double row. 

 Ocecium (pi. 21, fig. 25. oe.) lobed, large. Tube of oceciostom< 

 (oest. t.) arising freely from the wall of the ocecium, flattened 

 and curving forward. Oozciopon (oep.) elongated radially, more 

 or less slit-like; both tube and oceciopore smaller than a zoceeium 

 and its aperture. 



The list of synonyms given for this old species is shorter 

 than that given by many of the older writers, but there is 



