BRYOZOA OF THE PHILIPPINE REGION 291 



by two strong muscular attachments. There are large sporadic intcr- 

 zooecial avicularia, 17-19 tentacles. Special oral glands. 



Genotype. — Cigclisula {Escharoides) occlusa Busk, 1884. Recent. 



Retepora has 11 tentacles and Myriozoum has 28 tentacles; the 

 present genus therefore can not be compared with these two genera in 

 spite of the aspect of the ovicell or of the frontal with tubules. 



The structure of Cigclisula occlusa was published by Waters, 1909; 

 in 1913 he indicated that it should be the type of a new genus. 



CIGCLISULA OCCLUSA Busk, 1884 



Plate 31, figs. 3-10 



1884. Escharoides occlusum Busk, Polyzoa collected by Challenger, Report 



Scientific results Voyage Challenger, vol. 10, p. 150, pi. 21, fig. 8. 

 1888. Lepralia occlusa Wafers, Supplementary Report Polyzoa collected by 



Challenger, Report Scientific Results Voyage Challenger, vol. 31, p. 26, 



pi. 3, fig. 32-34. 

 1890. Lepralia occlusa Kirkpatrick, Hydroida and Polyzoa Torres Strait. 



Proc. Royal Dublin Society, new ser., vol. 6, p. 612; var. areolata, p. 618. 

 1909. Myriozoum occlusum Levinsen, Morphological and Systematic Studies 



on Cheilostomatous Bryozoa, p. 301 (gen. ref.). 

 1909. Lepralia occlusa Waters, Marine Biology of the Sudanese Red Sea, 



Journal Linnean Society, Zoology, vol. 31, p. 152, pi. 13, fig. 15, pi. 14, 



figs. 1 to 9 and 13. 

 1913. Escharoides occlusa Waters, Marine Fauna British East Africa and 



Zanzibar, Proc. Zoological Society, London, p. 519. 

 1921. Myriozoum occlusum Marcus, Bryozoen Swedish Scientific Expedition 



Australia, Kongl. Svenska Vetenskaps-Akademiens Handlingar, vol. 61, 



p. 20, pi. 1, fig. 8; pi. 2, figs. 1, 2. 



Measurements. — 



Aperture [ha =0.17 mm. „ . J Z2 =0.70 mm. 



(interior) [la =0.15 mm. Uz=0.50 mm. 



Variations. — In the interior the operculum articulates on two 

 small lateral condyles. With the intensity of calcification the zooecia 

 present exteriorily variable and often fantastic forms. The large 

 sporadic avicularia have their beak directed toward the top; but 

 frequently the beak is directed toward the bottom and they 

 are spatulated; they have a pivot or denticles. The frontal grating 

 of the ovicell is very fragile; it is covered by the ectocyst. Around 

 the peristomice some small tubules at times become transformed into 



lated glands (gl) and the ducts in section in the lowest middle zooecium, X85. 

 II. Showing gland (gl) and reservoir (r), X 250. I. Longitudinal section through 

 the shorter axis, showing the gland (gl), reservoir (r), diaphragm (//), and opercu- 

 lum (op), X85. J. Showing tabulated gland and the muscles by which it is 

 attached, X250. K. Longitudinal section through a lobulated gland, X250. 

 L. Glands and duct shown diagrammatically. M. Mandible of an interzooecial 

 avicularium, X85. N. Mandible of a peristomial avicularium, X85. O. Oper- 

 culum of an ordinary eooeoium, X85. (B-N. After Waters. 1889 ftnd 1909. 



P, Q. Opercula of ordii and ■>. s "> of Cigclisula serrulata 



$73. 



