250 



BRTOZOA 



Fig. 407 Crisia eburnea (Osburn). 



SUBORDER 1. CYCLOSTOMATA. 



Zooecia tubular, in most cases densely calcareous, with a wide ter- 

 minal, circular opening, and without operculum, avicularia, or vibracula : 

 4 families. 



Key to the families of Cyclostomata here described: 



! Colony distinctly jointed, and erect 1. CEISIIDAE 



a 2 Colony not distinctly jointed, and either recumbent or erect. 



&! Colony usually branching and recumbent, or more or less erect (discoid 



in Diastopora) 2. TUBULIPORIDAE 



6 3 Colony discoid 3. LICHENOPOBIDAE 



FAMILY 1. CEISIIDAE. 



Colony erect and branching, calcareous and with horn-like joints so 

 that it is more or less flexible, with jointed and often branching root 

 fibers given off from the base or from the internodes which serve to 



fasten it; zooecia in 1 or 2 rows; ten- 

 tacles 8 in number; large ocecia pres- 

 ent: 1 genus. 



CRISIA Lamouroux. With the 

 characters of the family: about 35 

 species. 



C. eburnea (L.) (Fig. 407). Colony white in color, forming bushy 

 tufts from 8 to 25 mm. high; zooecia in 2 rows and alternate, slightly 

 curved out, almost entirely adnate: cosmopolitan; common from Long 

 Island Sound to Arctic Ocean; California; 

 Europe; from low- water mark to 80 fathoms. 



FAMILY 2. TUBULIPOEIDAE. 



Colony entirely creeping and incrusted or 

 more or less erect, either simple or branched and 

 often radiating from a central point; zocecia in 

 1 or several rows, adhering to one another lat- 

 erally, with the upper end more or less free: 

 about 5 genera. 



TUBULIPORA Lamarck. Colony entirely re- 

 cumbent or partially erect, forming a variously 

 shaped expansion, either simple or branched; 

 zooids tubular, arranged in divergent series: 

 about 29 species. 



T. flabellaris (Fabricius) (Fig. 408). Colony 12 mm. in diameter, of 

 a pale purplish color, flabellate when young, but more or less circular and 

 lobed when old; zooscia punctate, long, and slender, .15 mm. in diame- 



Fig. 408 



Tubulipora flabellaris 

 (Osburn). 



