. Bulletin - United States National Museum. Science. BRYOZOA OF THE PHILIPPINE REGION 393 Zooecia \Lz mm. Apertura^a n=0,1° mm" (ovicelled) U2 = mm. P Ua = mm. Zooecia f£z= mm. Aperturaj^1^0,18-0"20 mm' (special) U2 = mm. lZa«= Variations.—The dimensions of the ovicelled zooecia are rather variable as well as the size of their opercula; the aperture bears also a proximal tongue of such a nature that the water can enter into the compensatrix only through two very small lateral slits. In place the operculum of the third zooecial form appears a little l
. Bulletin - United States National Museum. Science. BRYOZOA OF THE PHILIPPINE REGION 393 Zooecia \Lz mm. Apertura^a n=0,1° mm" (ovicelled) U2 = mm. P Ua = mm. Zooecia f£z= mm. Aperturaj^1^0,18-0"20 mm' (special) U2 = mm. lZa«= Variations.—The dimensions of the ovicelled zooecia are rather variable as well as the size of their opercula; the aperture bears also a proximal tongue of such a nature that the water can enter into the compensatrix only through two very small lateral slits. In place the operculum of the third zooecial form appears a little like an avicularian mandible but detached; it is a true schizoporid operculum indicating on its proximal sinus the existence of a compen- satrix and of a polypide. We have no anatomical knowledge which will permit us to recognize the function of these curious cellules. Affinities.—This curious species differs from Hippaliosina rostrigera Smitt, 1872, in its much smaller operculum and its different dimen- sions. It differs from Hippaliosina depressa Busk, 1892, figured by "Waters, 1889, in its much larger measurements, in its higher ovicell and in its inferiorly rounded 0 0. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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