252 



BRYOZOA 



Oj Colony incrusting or foliaceous and strongly calcified. 

 &! Colony incrusting ; front wall more or less membranous. 



c x No ridges on front wall 7. MEMBBANIPOBIDAE 



c a Front wall with prominent transverse or radiating ridges. 



8. CEIBRILINIDAE 

 6j Front wall not membranous ; colony either incrusting or erect. 



c x With a pore beneath the orifice 9. MICBOPOBELLIDAE 



c a With no such pore. 

 d^ Zooecia not perpendicular to general plane of colony and usually 



incrusting. 

 i Opening of zooecium with an indentation in lower lip . . 10. MYEIOZOIDAE 



e 2 No such indentation 11. ESCHABIDAE 



d a Zooecia vertical and heaped irregularly together 12. CELLEPOBIDAE 



FAMILY 1. ^TEIDAE. 



Zooecia tubular and erect, rising separately from a creeping stolonic 

 stem with a terminal opening and a lateral membranous area at the 

 upper end; operculum subterminal; no avicularia 

 or vibracula: 1 genus. 



JETEA Lamouroux. With the characters of 

 the family: 9 species. 



A. anguina (L.) (Fig. 409). Zocecia about 1 

 mm. high, white and glossy, more or less bent, 

 with a spatulate upper end and a ringed stalk; 

 stolon with regularly occurring thickenings, each 

 of which is part of a zocecium: Long Island 

 Sound northwards from shallow to deep water on 

 hydroids and seaweed; often common; Pacific 

 coast; cosmopolitan. 



FAMILY 2. EUCEATEIDAE. 



Fig. 409 

 JEtea anguina (Osborn). 



Colony erect and branching; the zocecia narrowest at the base and 

 expanding upwards, being linked together in a single row, or in double 

 rows placed back to back; openings usually oblique; 

 no avicularia, vibracula, or opercula: 5 genera. 



1. ETTCRATEA Lamouroux. Colony composed of a 

 creeping stolon and erect branching shoots; zocecia in 

 a single row placed end to end ; opening large and oval ; 

 ocecia terminal ; tentacular sheath terminating above in 

 a ring of setae: about 4 species. 



L. chelata (L.) (Fig. 410). Colony often much 

 branched, occasionally not erect; branches spring from just below the 

 opening: Vineyard Sound northwards, on seaweed, stones, etc., in shal- 

 low water and between tide lines; often common; Pacific coast; 

 cosmopolitan. 



Fig. 410 



Eucratea chelata 

 (Osburn). 



