NO. 1 OSB URN : EASTERN PACIFIC BRYOZOA CHEILOSTOMATA 131 



and lateral avicularia and dorsal vibracula are present, the avicularia 

 occasionally much enlarged and modified (giant avicularia). Occasionally 

 the frontal and lateral avicularia are of the same size, but more fre- 

 quently either the frontal or the lateral series will be larger than the 

 other. The ooecia are prominent, hyperstomial, and w^ith or without pores. 

 The genus is remarkably well represented in the Eastern Pacific 

 region. Genotype, Sertularia scruposa Linnaeus, 1758. 



Key to Species of Scrupocellaria 



1. Two axial vibracula 2 



Only one axial vibraculum 4 



2. Scutum oval, without cervicorn decoration, ooecium imperforate. 



harmeri 



Scutum wanting 3 



3. Spines strong, radicle chamber proximal to vibracular chamber. 



scruposa 



Spines vestigial, radicle chamber lateral profundis 



4. Scutum wanting or vestigial 5 



Scutum usually well developed 6 



5. Long curved lateral giant avicularia talonis 



Very broad frontal giant avicularia ferox 



6. Scutum variously forked 7 



Scutum broad, oar-shaped to broad oval 10 



7. Ovicell imperforate, giant elongate lateral avicularia. . . varians 

 Ovicell with pores 8 



8. Vibracular chamber transverse, broader than long ; outer and 



inner spines often bifurcate ; no giant avicularia. . panamensis 

 Frontal and sometimes lateral giant avicularia; vibracular 



chamber more or less triangular 9 



9. Giant frontal avicularia robust, rostrum hooked. . . bertholetti 

 Giant frontal avicularia very elongate, mandible directed 



proximally bertholetti var. tenuirostris 



10. Giant lateral avicularia long and curved unguiculata 



Lateral avicularia all normal in form 11 



11. Scutum small, oar-shaped; ooecia imperforate. . . . calif ornica 

 Scutum large, covering most of the opesia ; ooecia with or with- 

 out pores 12 



12. Vibracula very small; ooecia imperforate scabra 



Vibracula larger, groove diagonal or longitudinal, ooecium 



with pores 13 



13. Vibracular chamber two-thirds as long as zooecium. . . diegensis 



Chamber shorter, not more than half zooecial length. . . 14 



14. Groove of vibracular chamber diagonal mexicana 



Groove longitudinal 15 



15. Ooecial pores unusually large, zooecia 0.50 to 0.65 mm long. 



tnacropora 



Ooecial pores smaller; zooecia shorter 16 



