524 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



FILIFASCIGERA PLURIPORA, new species 



Plate 78, fig. 7 



Description. — The zoarium creeps over shells in sinuous branches. 

 The tubes are indistinct on the zoarial surface and striated trans- 

 versely. They are grouped in orbicular fascicles containing many 

 polygonal orifices (8 to 12). 



Measurements. — Diameter of fascicles, 0.5 mm; distance of fascicles, 

 2.00; diameter of orifice, 0.12; width of branches, 0.80. 



Occurrence. — D. 5217. Anima Sola Island, between Burias and 

 Luzon; 13° 20' N.; 123° 14' 15" E.; 105 fathoms; crs. gy. S.; 17.2° C. 



Eolotype.—C&t. No. 8337, U.S.N.M. 



FILIFASCIGERA PARVIPORA, new Bpecies 



Plate 78, fig. 8 



Description. — The zoarium encrusts shells; it is formed of short 

 ramified branches. The tubes are very little visible on the zoarial 

 surface. They are grouped in small orbicular fascicles, very salient, 

 oblique or erect. The orifices (4 to 8) are small and polygonal. 



Measurements. — Diameter of fascicles, 0.34 mm.; distance of fasci- 

 cles, 1.20; diameter of orifices, 0.06; and width of branches, 0.80. 



Affinities. — This is the smallest known species and is therefore easy 

 to determine. 



Biology. — The two species of Filifascigera known in the Philippines, 

 live in localities where the waters are very calm. The development 

 of the peristomies as well as the grouping of the tubes in fascicles are 

 therefore a biological necessity in connection with the pursuit and 

 capture of the plankton. 



Occurrence.— D. 5144. Jolo Light, Jolo; 6° 05' 50" N.; 121° 02' 15" 

 E.; 19 fathoms; co. S. 



Holotype.—C&t. No. 8338, U.S.N.M. 



Family CRISIIDAE Johnston, 1847 



Genus CRISIDIA Milne Edwards, 1838 



The sterile segments always consist only of one zoid ; the gonozoid 

 is the only member of its own segment; the membranous sac in the 

 gonozoid is constricted off into two parts; 9 tentacles. (Borg. 1924.) 



Genotype. — Crisidia (Sertularia) cornuta Linnaeus, 1758. Recent. 



Genus BICRISIA D'Orbigny, 1852 



The sterile segments, when branchless, consist of two zoids; the 

 fertile segments are composed of 3-5 zoids; the gonozoid is free for the 

 greatest part of its length and with the tube on its dorsal side; the 

 membranous sac in the gonozoid is constricted off into two parts; 

 8 tentacles. (Borg, 1924.) 



Genotype. — Bicrisia (Crisidia) edwardsiana D'Orbigny, 1839. 

 Recent. 



