BETOZOA 257 



mandible often prolonged into a long, slender spine; ooecia globose, above 

 the zooBcium: cosmopolitan; from tide lines to 300 fathoms. 



FAMILY 10. MYEIOZOIDAE. 



Colony incrusting or rising in a foliaceous or dendroid expansion; 

 zooecia calcareous without raised margins or membranous area; opening 

 with an indentation in the lower lip: 5 genera. 



SCHIZOPORELLA Hincks. Colony incrusting, sometimes several lay- 

 ers thick, or occasionally forming foliaceous expansions; avicularia 

 usually lateral: over 100 species. 



S. unicornis (Johnston) (Fig. 420). Zooecia ovate or rectangular 

 with a punctate surface, often silvery in appearance, an avicularium on 

 one or both sides of the opening; orifice circular; ooacia globose, with 





Fig. 418 Fig. 419 Fig. 420 



Fig. 418 Cribrilina annulata (Osburn). Fig. 419 Microporella ciliata (Osburn). 

 Fig. 420 Schizoporella unicornis (Osburn). 



radiating grooves ; colony forms a white or reddish spreading crust : South 

 Carolina to Massachusetts Bay; from tide lines to deep water, on shells, 

 stones, etc.; often very common; Europe. 



S. hyalina (L.). Zooecia elliptical, arranged irregularly in radiating 

 rows; surface smooth and shiny, often glassy and transparent; opening 

 terminal variable in shape, sometimes without the indentation; ooecia 

 globose and punctate: Long Island Sound to the Arctic Ocean from tide 

 lines to deep water ; on stones, etc., and often forming nodules on hydroids ; 

 cosmopolitan ; California. 



FAMILY 11. ESCHAEIDAE. 



Colony calcareous and incrusting, or erect, being lamellate or den- 

 dritic; zooecia without raised margins or membranous area; sometimes 

 with secondary opening, either elevated and enclosing an avicularium or 

 not: numerous genera. 



1. LEPRALIA Johnston. Zooecia usually ovate, with a more or less 

 horseshoe-shaped orifice which is arched above and straight and often 

 narrow below; colony incrusting or foliaceous, often radiating from a 

 central point: about 70 species. 



