NO. 1 OSBURN : EASTERN PACIFIC BRYOZOA — CHEILOSTOMATA 15 



4. Ovicell endozooecial Hincksinidae 



Ovicell hyperstomial 5 



5. Frontal membrane exposed, not covered by a pericyst. ... 6 

 Frontal membrane more or less covered by a pericyst, appearing 



like an ascophoran 7 



6. Ovicell elevated, a wide-open hood ; mural rim thin and flared 



outward ; strong distal spines Chapperiidae 



Ovicell more complete; mural rim not flared outward; spines 



variable Alderinidae 



7. Pericyst developed from an enlarged spine and with 2 to 4 cen- 



tral pores Hiantoporidae 



Pericyst with numerous large pores Arachnopusiidae 



Family Scrupariidae (Busk, 1852), Harmer, 1926 



Busk established the family Scrupariidae for Scruparia, but included 

 also the genera Hippothoa, Aetea, and Beania which are quite unrelated 

 even to each other. Harmer (1926:197) limits the family to the genera 

 Scruparia, Eucratea (Gemellaria) , and Brettia. 



"The family is characterised by the erect, frequently uniserial habit 

 of its members, by the tendency of the zooecia to have a tubular form 

 (perhaps a primitive feature), and by the correlated restriction of the 

 opesia to a part of the frontal surface, Hyperstomial ovicells occur in 

 some species, but there is no evidence that avicularia have been evolved 

 in the family" (Harmer, 1926:197). 



Key to the Genera 



1. Zoarium with a creeping base and erect branches; zooecia uni- 



serial; budding at the distal end and on the frontal im- 

 mediately proximal to the opesia ; ovicell hyperstomial on a 

 dwarfed zooecium Scruparia 



2. Zooecia uniserial, budding usually in pairs on the dorsal side 



at the distal end Brettia 



3. Zooecia biserial, back to back ; branches arise from the sides of 



the zooecia near the distal end Eucratea 



Genus SCRUPARIA Oken, 1815 



Zoarium primarily creeping, adnate to algae and stems of hydroids 

 and other Br>^ozoa, etc., but erect branches are often abundant. Zooecia 

 tubular, nearly transparent, narrow at the proximal end where they are 

 often slightly wrinkled, widening gradually toward the distal end. The 



