BRYOZOA OF THE PHILIPPINE REGION 377 



Occurrence.— D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 

 29 fathoms; co. S. 



Holotype — Cat. No. 8170, U.S.N.M. 



ADEONA ARCULIFERA, new species 



Plate 52, figs. 1, 2 



Description. — The zoarium is free, bilamellar; the fronds arc nar- 

 row, compressed, flat or somewhat undulated. The zooecia are dis- 

 tinct, separated by a deep thread, much elongated, completely sur- 

 rounded by a line of very small and closely arranged parietal dietellae; 

 the frontal is convex, smooth and forms a pad around the ascopore 

 and the avicularium. The ascopore is orbicular and placed in the 

 middle of the frontal. The avicularium is oblique, triangular, located 

 in the peristomie and adjacent to the apertura. 



Measurements. — 



r> • i [ftp = 0.15 mm. rj . \Lz = 0.50-0.55 mm. 



JPenstomice 7 _ in Zooecia, no _ n on 



[lp = 0.10 mm. 1 42 = 0.25-0.30 mm. 



Affinities. — The peristomice is very irregular and deformed by the 

 avicularium. There is no peristome on the adult zooecia and the 

 peristomie is formed by the great thickening of the frontal. 



The aspect of this species is very deceiving; in the arrangement of 

 its avicularium it is a Bracebridgia; in the form of zooecia it is an 

 Adeonellopsis; but the presence of an ascopore obliges us to class it 

 in Adeona. 



Biology. — The avicularium is very constant; it is a zooecial avicu- 

 larium. Its physiologic function is identical in the different genera 

 of the family. It is an absolutely essential organ indispensable to the 

 life of the zooecium. In its position it appears to be in relationship 

 with the hydrostatic system. All of our specimens were dead. 

 Occurrence. — 



D. 5141. Jolo Light, Jolo; 6° 09' N.; 120° 58' E.; 29 fathoms; 



co. S. 

 D. 5147. Sulade Island, Sulu Archipelago; 5° 41' 40" N.; 120° 

 47' 10" E.; 21 fathoms; co. S. Sh. 

 Holotype— Cut. No. 8171, U.S.N.M. 



ADEONA ARTICULATA, new species 



Plate 52, figs. 9-12 



Description. — The zoarium is bilamellar, articulated; the segments 

 are long, compressed, bifurcated, decorated with a wide longitudinal 

 crest; the fibers of articulation are short, chitinous, adjacent in a 

 thick bundle. The zooecia are distinct, separated by a deep thread, 

 small, elongated, elliptical, surrounded completely by a line of small 

 parietal dietellae; the frontal is convex and bears the ascopore and 

 avicularium arranged in a median furrow. The avicularium is oblique, 



