. Bulletin - United States National Museum. Science. BRYOZOA OF THE PHILIPPINE REGION' Genus COSTATICELLA Maplestone, 1900 445 The ovicell is a terminal gonoecium. The operculum has a slightly curved edge. The operculum of the gonozooecium much wider, has a straight proximal edge. The sternal area which is provided with 4-14 fenostrae is to a greater or smaller extent formed by a num- ber of generally hollow spines, springing from the sternal sinus and. A-G. natural Fig. 178.—Genus , 1895 Claviporella geminata W. Thompson, 1858. A. General aspect, }/2 size and the fron
. Bulletin - United States National Museum. Science. BRYOZOA OF THE PHILIPPINE REGION' Genus COSTATICELLA Maplestone, 1900 445 The ovicell is a terminal gonoecium. The operculum has a slightly curved edge. The operculum of the gonozooecium much wider, has a straight proximal edge. The sternal area which is provided with 4-14 fenostrae is to a greater or smaller extent formed by a num- ber of generally hollow spines, springing from the sternal sinus and. A-G. natural Fig. 178.—Genus , 1895 Claviporella geminata W. Thompson, 1858. A. General aspect, }/2 size and the frontal and basal surface. (After MacGillivray.) B. A trizooccial intcrnode with ovicell, X40. C. A similar internode on which the frontal wall of the ovicell and the covering kenozooecium have been removed. The basal wall of the endozooecial ovicell is seen, X40. D. A sagittal section through the gonozooecium and the ovicell, X40. E. A small avicularium, X100. (B-E. After Levinsen, 1909.) F. Operculum, X85. G. Mandible of the avicularium, X85 and X250. (F, G, After Waters, 1887.) H-N. Claviporella pusilla Wilson, 1880. H. Lateral view of two zooecia. In the proximal part of each zooecium the extremely small pedal chambers, X26. I. An internode with ovicell, X40. J. The distal end of a zooecium from the basal surface after the removal of the basal wall. The suture in which the two spines meet is not seen in this figures but on the uppermost zooecium in figure I, X75. K. The proximal end of a zooecium. The rudimentary pedal chambers are seen, X75. L. The inner wall of the pedal chamber forming a uniporous septula, X200. M. The operculum, X100. N. The scapular and the infra- scapular chambers, X200. (H-N. After Levinsen, 1909.) separated by fissures. The hinge teeth are rudimentary or indistinct. The suprascapular chamber has a calcified roof. The frontal surface of the covering kenozooecium of the ovicell has two large, trans- versely oval fenestrae. Genotypes.—Costaticella (Cat
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