NO. 3 OSBURN : EASTERN PACIFIC BRYOZOA CYCLOSTOMATA 709 



3. Peristomes slightly expanded at the tips and bearing a number 



(3 to 5) of long thin spines fimbriata 



Peristomes not expanded at the tips, sometimes prolonged into 



a single process, but never fimbriated hispida 



4. Pores of the central cancelli larger than the tubule apertures ; 



pin-head spicules very abundant californica 



Pores of cancelli small, the v^^alls more heavily calcified ; pin- 

 head spicules rare or wanting ovoidea 



5. Radii usually prominent in the form of short fascicles 2 to 4 



tubules in width 6 



Radii more elongate and less prominent, with 2 to 4 rows of 



tubules, zoaria often very complex 8 



6. Zoarium high, cylindrical, with a terminal crown of high 



marginal radii, the encrusting base larger than the erect 



stem; central, vertical budding astraea 



Zoarium low, without an erect stem 7 



7. Radial fascicles small and low, cancelli of central area nearly 



closed by a funnel-shaped diaphragm octoradiata 



Fascicles larger, with more tubules, and higher; cancelli large 



and nearly wide open alaskensis 



8. Zoarium highly complex, composed of numerous lateral sub- 



colonies which are separated by rows of cancelli; radii 



moderately high, 2 to 4 rows of tubules separata 



Zoarium simple; radii usually forming a low ridge of 2 to 4 

 series of tubules; central area ovoid and moderately large; 

 sub-colonies superposed vertically stellata pacifica 



Disporella fimbriata (Busk), 1875 

 Plate 75, figs. 2 and 3 



Discoporella fimbriata Busk, 1875 :32. 

 Lichenopora fimbriata. Busk, 1886:26. 

 Disporella spinulosa Jullien, 1888:83. 

 Lichenopora fimbriata. Waters, 1904:96; 1905:250. 

 Lichenopora fimbriata, O'Donoghue, 1923:15. 

 Disporella fimbriata, Borg, 1944:229. 



Busk's original description is as follows: "Zoarium almost conical; 

 cells very indistinctly serial, distant; interstitial pores almost obsolete; 

 mouth expanded, peristome fimbriated." 



