United States National Museum, Smithsonian Institution, United States. Department of the Interior · Washington : Smithsonian Institution Press, [etc.]; for sale by the Supt. of Docs., U.S. Govt Print. Off. · leaf 310
284 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. pores. There are two pairs of lateral dietellae and a distal dietella. The ovdcell is hvperstomial and is always closed by the operculum. The avicularia are always … H *25 Fig. 82. — Genus Membraniporella Smitt, ]S73. A. Membraniporella distans MacGillivray, 1885. A. Zooeciura, X 55, showing terminology. (After Levinsen, 1909.) B-K. Membraniporella nitida Johnston, 183S. B. Larva, oral face, X 75. C. Aboral view of larva, X75. D. Free larva seen in profile, X…
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