BRYOZOA OF THE PHILIPPINE REGION 



527 



zoids; the membranous sac in the gonozoid is not constricted off into 

 two parts; 8 tentacles. (Borg, 1924.) 



Genotype. — Crisia (Sertvlaria) eburnea Linnaeus, 1758. 



Range. — Eocene (Lutetian) — Recent. 



CRISIA DELICATULA, new species 



Plate 78 fig. 9. 



Description. — The segments are long, very thin, rectilinear, narrow- 

 ing at the base and formed by 20 tubes. The lateral peristomes are 

 thin, alternate, little salient, little visible on the zoarial dorsal, more 



Fig. 219.— Genus Crisiella Borg, 1924 



A, B. Crisiella producla Smitt, 1866. A. Basal part of zoarium, X30 showing 

 primary disk, rhizoids, basal tubulus and dichotomous mode of branching. B. 

 Fertile internode, X20, with full grown gonozoid (G.) twisted almost 180°. 



distant than the zoarial width. The basis ramae is wide and placed 

 at a zoarial bend. 



Measurements. — Diameter of peristome, 0.08 mm.; distance of ori- 

 fices, 0.30-0.34.; and width of segments, 0.24. 



Affinities. — In its great fragility and in its numerous tubes to the 

 segments, this species can be compared only with Crisia elongata 

 Milne Edwards, 1838, of Australia, but it differs from the latter in a 

 slightly greater distance between the tubes (0.30-0.34 mm., in place 

 of 0.28-0.32 mm.). Species of Crisia live in small bushes attached 

 to floating algae; they have therefore never lived where they are 

 dredged in the condition of detached segments. 



