. Bulletin - United States National Museum. Science. NORTH AMERICAN lATER TEETIABY AND QUATERNARY BRYOZOA. 185 corner. C. Details of the aperture. (After D'Orbigny, 1852.) D. Portion of a recent zoarium, X 20, with several ovicelled zooecia. The operculum closes the apertiu-e. E. Extremity of a zoarium. F. Transverse section. (E, F, after Manzoni, 1877.) G. Operculum, X 85. (After Waters, 1878.) H-J. Mynozoum coarctatum Sans, 1850. H. Transverse section. (After Smitt, 1868.) I. Oper- culum, X 85. J. Mandible, X 85. K-0. Myriozoum subgradle D'Orbigny, 1852. K. Portion of a zoarium with avicular
. Bulletin - United States National Museum. Science. NORTH AMERICAN lATER TEETIABY AND QUATERNARY BRYOZOA. 185 corner. C. Details of the aperture. (After D'Orbigny, 1852.) D. Portion of a recent zoarium, X 20, with several ovicelled zooecia. The operculum closes the apertiu-e. E. Extremity of a zoarium. F. Transverse section. (E, F, after Manzoni, 1877.) G. Operculum, X 85. (After Waters, 1878.) H-J. Mynozoum coarctatum Sans, 1850. H. Transverse section. (After Smitt, 1868.) I. Oper- culum, X 85. J. Mandible, X 85. K-0. Myriozoum subgradle D'Orbigny, 1852. K. Portion of a zoarium with avicularia, X 25. L. Section of tissue, X 25,Rowing the pol>-pide8 in position, the covering integument (a=ectocyst) over the inner one (6); also the long pore tubes which in various places have a disk separating the con- tents on the two sides of the disk. The oral diaphragm is seen as withdrawn. M. Section through pol^^pide, X 85, showing: dm, the diaphragm; op, the operculum, T\-ith dotted lines to show the position when partly open; d, disks in the pore tubes. N. Covering integument (a), X 85. O. End of pore tube, X 500, showing the covering integument (a) and the inner one (J). It contains some cellules of mesenchymatous tissue; P. Operculum X 85; Q. Mandible, X 50. (1-2 after Waters, 1900.) Family MYRIOZOIDAE Smitt, 1868. The frontal is thick and bears a tremocyst with tubules. Uniporous septulae or dietellae are present. The aricularia are adventitious and bear a pivot. The ovicell is hyperstomial not adjacent to the zooecium and lodged in a nichelike depression of the distal zooecium. According to Levinsen the genera of this family are as follows: Easwellia Busk, 1884 (referred to the Galeopsidae by us). Gephyrophora Busk, 1884 (Galeopsidae). Myriozoella Levinsen, 1909. Myriozoum Donati, Fio. 35.—Genus Myriozoella Levinsen, 1909. A-G. Myriozoella Crustacea Smitt, 1868. A. Zooecia with peristomes and with cancellated frontal B. Zooecia showing the ovicell. C. Zooecia
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