BRYOZOA OF THE PHILIPPINE REGION 129 



VELUMELLA PHILIPPINESIS, new species 



Plate 13, figs. 1-4 



Description. — The zoarium encrusts shells. The zooecia are dis- 

 tinct, united by their mural rim, elongated, rectangular; the mural rim 

 is thick, salient, flat, with sharp or fringed termen; the cryptocyst is 

 deep, somewhat concave, raised toward the opesium, smooth or 

 sometimes granulated. The opesium is semielliptical, very little 

 elongated; the proximal border is very little convex and bears two 

 small lateral symmetrical and very regular indentations. The ovicell 

 is endozooecial. The onychocellarium is primoserial, as large as a 



rx r\ ^ 



D E F 



C G H 



Fig. 31. — VelumeUa philippinensis, new species, and also other species 



A. Mandible of onychocellarium, X 85. B. Much chitinized operculum, X 85. 

 Around each opercular valve there is a chitinous peristome supported on the 

 zooecial mural rim. C. Opercular valve, nonchitinized, X85. D, E. Dacry- 

 onella trapezoides, new species. Large and small opercular valves, X85. F. 

 Micropora rimulata, new species. Operculum, X 85. G, H. Cupularia umbellata 

 DeFrance, 1823. G. Seta of vibraculum, X85. H. Opercular valve, X85. 



zooecium; its beak is narrow or rounded; its opesium is median, 

 oval, with the point below. 

 Measurements. — 



Opesium jho = 0.12 mm. Zooecia fZ2 = 0.50 mm. 



(small zooecia) [lo = 0.10 mm. (small) \lz = 0.32 mm. 



Opesium J^o = 0.18 mm. Zooecia[Z2 = 0.50-0.60 mm. 



(large zooecia)lZo = 0.14 mm. (large) \lz = 0.30-0.36 mm. 



Opesium of fTio = 0.20mm. Onychocel-[Zon = 0.50 mm. 



onychocellarium 1^2 = 0.10 mm. larium jZ<m = 0.24 mm. 



Structure. — The opercular valve is bordered by a sclerite which fits 

 into an exterior sclerite attached to the ectocyst. It is absolutely 

 similar to that in Onychocella. It is sometimes strongly chitinized 

 and has the opaque aspect of our Figure 2. 



The rachis of the onychocellarium is bordered inferiority by a 

 double sclerite; the interior sclerite is median and thickened in the 

 superior linear portion. The two membraneous wings are small, very 

 thin, slightly contracted at the superior two-thirds and rounded at 

 their extremity. 



