. Bulletin - United States National Museum. Science. A C Fig. 36.—Steganoporella mandibulata Harmer, 1926 A. Large operculum, X85. B. Avicularium mandible, X85. C. Small operculum, X85. Harmer's figure. The details of this operculum are shown on Har- mer's figure. Measurements.— „ . \Jio = n \Lz = mm. Opesium L _A Zooecium 7 _ r Uo = [lz= mm. . , . fLav = mm Aviculanumi-, _„_ Hav = mm. Structure.—We have had the chance to study living specimens. All of the details of the zooecia are covered over by a thick opaque ectocyst; the articulation of the o
. Bulletin - United States National Museum. Science. A C Fig. 36.—Steganoporella mandibulata Harmer, 1926 A. Large operculum, X85. B. Avicularium mandible, X85. C. Small operculum, X85. Harmer's figure. The details of this operculum are shown on Har- mer's figure. Measurements.— „ . \Jio = n \Lz = mm. Opesium L _A Zooecium 7 _ r Uo = [lz= mm. . , . fLav = mm Aviculanumi-, _„_ Hav = mm. Structure.—We have had the chance to study living specimens. All of the details of the zooecia are covered over by a thick opaque ectocyst; the articulation of the opercula is a line somewhat concave attached laterally to the two inferior extremities of the distal dome. The ectocyst entirely covers the avicularium and it contains only a small perforation corresponding to the mandible. There is only one form of zooecia. In spite of the presence of the primoserial avicularia this species is indeed a Steganoporella; its opesium contains the characteristic polypide tube; its operculum is provided with a sclerite with a prong as in most other species of this genus. Biology.—The species prefers depths from 30 to 40 meters but can descend to a greater depth. The larvae became fixed toward the end of the month of February, 1909. The species accompanies Stegano- porella magnilabris but it is much more 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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