BRYOZOA OF THE PHILIPPINE REGION 95 



MEMBRENDOECIUM OVATUM, new species 



Plate 6, figs. 3-5 



Description. — The zoarium encrusts shells, Orbitoides, nullipores 

 and bryozoa. The zooecia are distinct, separated by a deep furrow, 

 elongated, pyriform, enlarged at the base; the mural rim is salient, 

 fiat, thin at the top, very much enlarged at the base where it is often 

 transformed into a cryptocyst. The opesium is anterior, oval, entire. 

 The small avicularia are placed in the interzooecial angles; they are 

 triangular, erect, with the beak turned toward the top. The ovicell 

 is endozooecial, small, smooth, little convex. The ancestrula is 

 smaller but of the same form as the other zooecia. 



Measurements. — 



Operculum!? = - 3 o ° mm - Zooeciumj^ = ' 50 mm " 



\lo = 0.22 mm. \lz = 0.35-0.40 mm. 



Affinities. — The species is closest to Membrendoecium (Pyripora) 

 confluens Canu, 1907 from the Lutetian of the environs of Paris, but 

 the present form differs in its greater dimensions and in its smooth 

 and nongranular mural rim. 



Polypidian regeneration is frequent in all the species of Mem- 

 brendoecium, but it attains here an extraordinary frequence. Figure 3 

 shows a specimen in which all the zooecia have undergone a double 

 or triple regeneration. All the specimens collected were dead. 

 Almost all of them have been collected in the numerous isles of the 

 Sulu Archipelago. 

 Occurrence. — 



D. 5137. Jolo Light, Jolo; 6° 04' 25" N.J 120° 58' 30" E.; 



20 fathoms; S., Sh. 

 D. 5139. Jolo Light, Jolo; 6° 06' N.; 121° 02' 30" E.; 20 



fathoms; co. S. 

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



co. S. 

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



19 fathoms; co. S. 

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



120° 47' 10" E.; 21 fathoms; co. S., Sh. 

 D. 5151. Sirun Islands, Sulu Archipelago; 5° 28' 40" N. 



120° 27' 15" E.; 24 fathoms; co. S., Sh. 

 D. 5179. Romblon Light, Romblon; 12° 38' 15" N.; 122° 12' 

 30" E.; 37 fathoms; hard S. 

 Cotypes.— Cat. No. 7868, U.S.N.M. 



MEMBRENDOECIUM LAGUNCULUM, new species 



Plate G, figs. 6-11 



Description. — The zoarium is unilamellar and incrusts algae, 

 chitinous sponges, corals and bryozoa. The zooecia are distinct, 

 separated by a furrow of little depth, elongated, elliptical; the mural 



