. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEW BRYOZOAN BORING IN SNAIL SHELLS A 279. Figure 3. Loosened opercula of Penetrant ia clionoides sp. nov. (A) Dorsal view of operculum. (B) Detail of toothed ridge on anterior sur- face of operculum. (C) Lip on anterior end of operculum. (D) Ventral view of operculum showing the two diametrically opposed protrusions. Figure 5. Borehole apertures and sieves of Penetrantia clionoides sp. nov. (A) Surface view of borehole apertures, sieves and individual holes. (B) Sieve. (C) Sieve over fully formed polypide complete with oper
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NEW BRYOZOAN BORING IN SNAIL SHELLS A 279. Figure 3. Loosened opercula of Penetrant ia clionoides sp. nov. (A) Dorsal view of operculum. (B) Detail of toothed ridge on anterior sur- face of operculum. (C) Lip on anterior end of operculum. (D) Ventral view of operculum showing the two diametrically opposed protrusions. Figure 5. Borehole apertures and sieves of Penetrantia clionoides sp. nov. (A) Surface view of borehole apertures, sieves and individual holes. (B) Sieve. (C) Sieve over fully formed polypide complete with operculum. Note early stage of bryozoan borehole (arrow). (D) Detail of sieve in 'C. nm and for width vary from nm to nm. The operculum is thinnest at its hind edge and thickest at the rear of the crescent. Examination of the dot distribution maps indicates that the opercula are composed mainly of calcium car-. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
