NO. 1 OSBURN: eastern pacific BRYOZOA — CHEILOSTOMATA 119 



Division V CELLULARINA Smitt, 1867 

 The zoarium is erect, flexible or jointed and attached by radicles 

 (loosely encrusting in a few cases) ; zooecia not heavily calcified, as a 

 rule, and all facing in the same direction (except in Farciminariidae 

 where they form rounded stems) ; avicularia sessile or pedunculate (both 

 in the Epistomiidae), sometimes modified into vibracula; spines occur in 

 most of the species, sometimes modified into frontal scutes above the 

 opesia, Ovicells usually hyperstomial. 



Key to Families 



1. Avicularia pedicellate on a jointed stalk 2 



Only sessile avicularia present 3 



2. Stalked avicularia only ; ovicells hyperstomial. . . Bicellariellidae p'5l 

 Avicularia of two kinds, stalked and sessile ; no ovicells, repro- 

 duction by slightly enlarged gonozooecia. . . , Epistomiidae p '5"t> 



3. Zooecia in 4 or 6 series around a central axis; avicularia usu- 



ally paired on the gymnocyst Farciminariidae p ""^ 



Zooecia usually biserial, all facing the same way, usually with a 



scutum. Ooecia hyperstomial or endozooecial. .Scrupocellariidae p*''' 



Family Farciminariidae Busk, 1852 



Zoaria erect, dichotomously branched, the zooecia arranged in longi- 

 tudinal rows (generally 4 to 6) around an axis formed by the separating 

 walls ; uniporous septulae ; avicularia frontal ( dependent ) , ovicells endo- 

 zooecial. (After Levinsen. 1909). 



Genus NELLIA Busk, 1852 

 The zoarium is erect, four-sided, jointed at the bifurcations. The 

 zooecia are arranged in alternate pairs, the two of each pair opening in 

 opposite directions; spines wanting; a pair of avicularia on the basal 

 gymnocyst; ooecia endozooecial and small but moderately conspicuous. 

 Genotype, Nellia oculata Busk, 1852. 



Nellia oculata Busk, 1852 <" ] 

 Plate 13, fig. 4 



Nellia oculata Busk, 1852:18. 

 Nellia oculata, Harmer, 1926:240. 

 Nellia oculata, Canu and Bassler, 1928:26. 

 Nellia oculata, Osburn, 1940 :400. 



The zooecia are elongate, varying considerably, from 0.45 to 0.60 mm 

 in length; in width they are fairly constant, about 0.18 mm, and main- 



