254 



BRTOZOA 



B. ciliata (L.) (Fig. 413). Colony forming feathery tufts 12 mm. 

 high, white in color; zocecium with 4 to 7 very long slender spines along 

 its upper margin : Atlantic coast, on hydroids and algae ; Europe. 



2. BTTGTJLA Oken. Zocecia more or less quadrangular, 

 arranged in 2 or more rows; opening large, not oblique; 

 avicularia in form of a bird's head: about 35 species, 9 

 on the Atlantic coast, 8 on the Pacific. 



Key to the species of Bugula here described: 



Oj Zocecia in 2 rows B. TURBITA 



a 2 Zocecia in 3 or more rows. 



b t Avicularia not at base of aperture B. FLABELLATA 



& 2 Avicularia at base of aperture B. MUREAYAN A 



Fig. 413 

 Bicellaria 



ciliata 

 (Osburn). 



Fig. 414 



Bugula 



flabellata 



(Osburn). 



1, ooecium 



2, avicularium 



B. turrita (Desor). Colony up to 30 cm. or more in height, com- 

 posed of flat branches growing in spirals, each branch with 2 rows of 

 zooecia, each zooecium with a spine on the outer upper angle ; color yellow : 

 North Carolina to Casco Bay, very common in shallow water. 



B. flabellata (Thompson) (Fig. 414). Colony up to 25 

 mm. high, composed of broad flat branches, each with from 

 3 to 7 rows of zooecia, each upper angle with 2 spines; of 

 an ashy color when dried, flesh color when alive : Vineyard 

 Sound and northwards in shallow water; common; Pacific 

 coast; cosmopolitan. 



B. murrayana (Johnston). Colony a bushy tuft up 

 to 50 mm. high and like the above, with 3 to 12 rows of 

 zofficia; each upper angle with a stout erect spine and 

 1 to 5 long slender spines on each lateral margin; long 

 clasping fibers present; ocecia with radiating striae; straw color when 

 dry: circumpolar, south to Vineyard Sound in rather deep water; 

 Europe; Pacific coast. 



FAMILY 5. CELLABIIDAE. 



Colony erect, slender, cylindrical, calcareous, usually dichotomously 

 branching and jointed; zocecia in 1 or more rows, lozenge-shaped or hex- 

 agonal and arranged in series around a central axis, making the branch 

 cylindrical: 8 genera. 



CELLARIA Lamouroux. Colony jointed, the internodes connected by 

 flexible horny tubes; zooecia surrounded by a raised border; avicularia 

 of simple type, resembling the ordinary zooecium; ocecia concealed, the 

 opening being just above the mouth : several species. 



0. fistulosa (L.) (Fig. 415). Shape of zooecium variable; orifice 

 arched above, slightly incurved below; area surrounding it minutely 

 pitted; avicularium just above it and in the same line with the zooecium; 



