252 



BRYOZOA 



a.2 Ctdouy iucrustiiig: or foliaceous and strongly calcifiod. 



61 Colony iucrusting ; front wall more or less membranous. 



C'l No ridges on front wall 7. Membraniporidae 



Ca Front wall with i)roraineut transverse or radiating ridges. 



8. Cribrilinidae 



62 Front wall not membranous ; colony either incrusting or erect. 



Ci With a pore beneath the orifice 9. Micro porellidae 



C2 With no such pore. 

 di Zooecia not perpendicular to general plane of colony and usually 

 incrusting. 

 €1 Opening of zooecium with an indentation in lower lip.. 10. Myriozoidae 



ej. No such indentation 11. Esciiaridae 



d^ ZocEcia vertical and heaped irregularly together 12. Celleporidae 



Family 1. ^TEIDAE. 



Zooeeia 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. 



.5ITEA Lamouroux. "With the characters of 

 the family: 9 species. 



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

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

 with a spatuiate upper end and a ringed stalk; 

 stolon with regularly occurring thickenings, each 

 of which is part of a zooecium: Long Island 

 Sound northwards from shallow to deep water on 



Fig. 409 

 JEtea anguina (Osboru). 



hydroids and seaweed : 

 coast; cosmoiDolitan. 



often common : Pacific 



Family 2. EUCRATEIDAE. 



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

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

 row^s placed back to back; openings usually oblique; 

 no aviculaiia, vibracula, or opercula: 5 genera. 



1. EuCRATEA Lamouroux. Colony composed of a 

 creeping stolon and erect branching shoots; zooecia in 

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

 ooecia 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). 



