NO. 2 OSBURN: eastern pacific BRYOZOA CHEILOSTOMATA 317 



7. Avicularia wanting (but see also some species of 



Hippodiplosia) Dakaria 



Avicularia usually present 8 



8. Tremocyst incomplete, leaving a narrow semicircular area proxi- 



mal to the aperture; pores of ovicell usually irregular; avicu- 

 laria present or wanting Hippodiplosia 



Without a semicircular suboral area, pores of ovicell regularly 

 distributed, avicularia present Emballotheca 



Genus SGHIZOPORELLA Hincks, 1887 



Schizopodrella Canu and Bassler, 1917. 



The frontal is a tremocyst; aperture semicircular distally, with a 

 slight vestibular arch, the proximal border with a rounded sinus ; oper- 

 culum well chitinized, the muscle attachments at some distance from the 

 border, Ovicell hyperstomial, not closed by the operculum. Avicularia 

 present, often at the side of the aperture. 

 Genotype, Lepralia unicornis Johnston, 1847. 



Key to Species of Schizoporella 



1. Avicularia present 2 



Avicularia wanting 4 



2. Frontal pores large and numerous, avicularia long- 



pointed, a small suboral umbo unicornis 



Pores smaller and more scattered, avicularia rounded 



or short pointed, ovicell marginated 3 



3. Sinus broadly rounded dissimilis 



Sinus narrower, more or less v-shaped cornuta 



4. Sinus somewhat v-shaped, frontal pores stellate . . . trichotoma 

 Sinus broader, semicircular linearis inarmata 



Schizoporella unicornis (Johnston), 1847 

 Plate 37, figs. 1-2 



Lepralia unicornis Johnston, 1847 :320. 

 Schizoporella unicorniSj Hincks, 1880:283. 

 Schizoporella unicornis, Osburn, 1940 :419. 



Zoarium encrusting shells, stones and almost anything that will afford 

 attachment, often very irregular, frequently multilaminar, sometimes 

 forming tubular branched colonies. Zooecia of the primary layer usually 

 oriented, quadrangular or hexagonal ; the frontal a thick tremocyst with 



