^^08] Rohetison. — Incrusting Bryozoa. 285 



Schizoporella Hincks. 



Lepralia (part) Johnston, 1847. 

 lientoschareUa d 'Orbigny, 1850-52. 

 Schizoporella Hincks, 1880. 



Zoarium incrusting, or forming foliaceons expansions. Zooecia 

 with a senii-circnlar or snborbicular orifice, the lower margin 

 with a central sinus. AvicuJaria usually lateral, sometimes me- 

 dian, with an acute, or rounded, or spatulate mandible ; occasion- 

 ally wanting. 



KEY TO SPECIES OF SCHIZOPOEELLA. 



1. Zooecia with avicularia 9 



1. Zooecia without avicularia 2 



2. Zooecia elongated 3 



2. Zooecia not elongated 6 



3. Sinus shallow 4 



3. Sinus distinct, sometimes shallow 5 



4. Zocecia with front wall porous S. insculpta 



4. Zooecia with front wall not porous 5 



5. Front wall marked by transverse ridges or lines S. hyalina 



6. Zooecia rhomboidal 7 



6. Zooecia not rhomboidal 8 



7. Sinus shallow S. areolata 



7. Sinus distinct 8 



8. Ooecia smooth , S. cecili 



8. Oceeia porous S. linearis var. inarmata 



9. Avicularia on one side of the orifice only 10 



9. Avicularia on both sides of the orifice S. biaperta 



9. Avicularia median 12 



10. Zooecia with whole surface porous 11 



10. Zooecia with marginal pores only 12 



11. Avicularia with mandible directed downward S. longirostrata 



11. Avicularia with mandible directed upward 12 



12. Zooecia with an umbo below the orifice S. oligopus 



12. Zooecia without an umbo, but frequently with an avicularium below 



the orifice S. tumulosa 



13. Avicularia with mandible rounded or oval S. aurlculata 



53. Schizoporella areolata Busk. 



PI. 18, fig. 38. 

 Lepralia areolata Busk, 1854, pt. 2, p. 82, pi. 83, figs. 3, 4". 

 Zoarium forming a rather thick calcareous crust over sponge. 

 Zoacia large, subovate or diamond shaped, alternate, outline of 

 each distinctly marked; front wall slightly convex and thickly 



