BRYOZOA OF THE PHILIPPINE REGION 491 



ha = 0.10 mm. 



Measurements. — Aperture, , 



F [la = 0.09 mm. 



Affinities. — This species resembles Conescharellina delicatula in the 



form of the aperture but differs from it in the oblique arrangement 



of the apertural rows which do not converge toward the apex, and in 



the non convex base with pores only at the center. 



Occurrence. — D. 5134. Balukbaluk Island, Sulu Archipelago; 6° 

 44' 45" N.J 121° 48' E.; 25 fathoms; fine S. 

 Cotypes.— Cat. No. 8292, U.S.N.M. 



CONESCHARELLINA BREVICONICA, new species 



Plate 69, figs. 10-17 



Description. — The zoarium is a small cone, very short, with a 

 sharp pointed apex; it is always wider than high. The zooecia 

 are large, little numerous, arranged in quincunx; the interzooecial 

 avicularia are large, elliptical, with very fragile pivot. The aperture 

 is large, orbicular or elliptical, with a very wide, little distinct sinus; 

 the proximal pore is large and distinct. The base is flat and exhibits 

 zooecial ribs arranged around a more or less large cancellated center. 



Measurements. — 



(/i=1.25-1.50 mm. 

 1 1 = 2.00 mm. 



Variations. — This species is very variable, the base especially 

 presenting various aspects according to the development of the 

 central cancellated portion. The orifices are hexagonal and many 

 of them are closed by a perforated pellicle. Around the base the 

 zooecia are much larger and often incomplete. 



In meridian section the internal zooecia are small, rectangular, 

 quite variable in number. As in all the other species, these have 

 no communication among themselves nor with the pores of the base. 

 The walls of the other zooecia are very thick. 



The operculum is very thin, oval and the distal rimule is visible 

 and marked only by a gradual narrowing of the width. 



Affinities. — This species differs from the other species with zooecia 

 in quincunx, Conescharellina elongata and C. obliqua, in its largo 

 oral dimensions and in its large cancellated basal center; its very 

 spinous apex is also characteristic. 



Biology. — This species has furnished most of the specimens of the 

 genus. Its habitat is in the interior of the oriental portion of the 

 Archipelago between the tenth and fourteenth parallels. It prefers 

 the narrow passes between the islands and the more or less sand} 7 

 bottoms. It lives at depths of 145 to 214 meters, but we have a 

 single dead specimen dredged at 858 meters. 



. \ha = 0.20 mm. ~ 



Aperture , _ . _ Zoarium 



Ua = 0.15 mm. 



