428 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



areolar, scattered pores, terminated by a long and triangular avicula- 

 rian beak. The aperture is somewhat elongated and partially buried 

 by the avicularian beak. The aperture is only visible on the deep 

 zooecia. The zooecial avicularia are very rare, small ; their mandible 

 is very narrow. The incomplete zooecia are closed by a thick ectocyst. 

 Measurements. — 



Aperturaj^ - 13 mm ' Zooecial^ ' 50 mm ' 



IZa = 0.11 mm. \lz = 0.30-0.50 mm. 



Variations. — The zoarial surface is very irregular and the photog- 

 raphy of it is very difficult. On the inferior face the zooecia are dis- 

 tinct, separated by a furrow and arranged in radial rows. The 

 operculum is very fragile, the proximal border and the muscular 

 attachments are thick, there are transverse ornaments in the inferior 

 portion. 



Occurrence.— D. 5137. Jolo Light, Jolo; 6° 04' 25" N.; 120° 58' 

 30" E.; 20 fathoms; S. Sh. 



Holotype.— Cat. No. 8247, U.S.N.M. 



HOLOPORELLA PYGMAEA, new species 



Plate 62, fig. 1 



Description. — The zoarium is a small mass, more or less globular, 

 attached to bryozoa or to fragments of shells. The zooecia are small, 



O A o 



B C D 



Fig. 167. — Genus Holoporella Waters, 1909 



A-D. H. subflava, new species. Three forms of opercula, and a mandible of 

 an interzooecial avicularium, X85. E. H. pygmaea, new species. Operculum, 

 X85. 



globular, erect; the frontal is smooth and bears in front of the aper- 

 ture an erect and very salient avicularian beak. The aperture is 

 median, somewhat transverse, semielhptical. On the deep zooecia 

 the aperture and the avicularian beak only are visible; the latter is 

 large, very salient, cylindrical and elevated almost to the level of the 

 avicularian beak of the superficial zooecia. 

 Measurements. — 



Apertura!^ ' 08 mm ' Zooeciajf 2 = 030 mm - 



Ua = 0.11 mm. 122 = 0.30 mm. 



Variations. — As in all the Celleporidae the zooecial measurements 

 are only approximate and are very variable. We have not observed 

 zoarial avicularia. The opercula are small, very thin; the muscular 

 attachments are placed near the border and are often little distinct. 

 Our specimens were living. 



