Bulletin - United States National Museum - Smithsonian Institution

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58 BULLETIN 96, UNITED STATES NATIONAL MUSEUM. convexity of the frontal ; they are quite apparent when the prepara- tion is properly inclined. The spiramen is little visible in perspective because it is in a plane almost perpendicular to the zooecial plane. Occurrence.—Lower Jacksonian: Jackson, Mississippi (rare). Ty2)e.—C^t. No. 62603, IJ.S.N.M. Genus HASWELLIA Busk, 1884. 1SS4. Hafiicellia Busk, Report on the Polyzoa collected l^y H. M. S. Challcnyer, pt. 1, p. 171. The apertura has its proximal border notched by a very wide rimule not separated from the anter. The frontal is a very thiclc tremocyst. The spiramen is a small salient tube. The zoarium is cylindrical. Genotype.—Jlaswellia {Myrlo2oum) austraUensis Haswell, 1880. Range.—Tongrian-Recent. SEMIHASWELLIA, new genus. The zooecia are disposed only on one side of the zoarium; the dorsal bears only avicularia. The frontal and the dorsal are of the same nature and are formed of a tremocyst with sulci. Genotype.—Porina prohoscklea Waters, 1888. Range : Jacksonian- Recent. This new genus is zoarial; no distinct zooecial function separates it from Haswellia. Nevertheless it has some important zoarial func- tions susceptible of giving generic characters; the very constant presence of small dorsal avicularia seems to be a very good character. The recent specimens are extremely rare and it is still not possible to study them in detail. Species of both flaswellia and Semihas- wellici occur in the Jacksonian of the Southern <strong>States</strong>. Genus GIGANTOPORA Ridley, 1881. 1881. Gigantopora Ridley, Zoological collections made din-ing survey of H. M. S. Alert. Proceedings Zoological Society London, p. 47. The apertura bears a rimule. The frontal is an olocyst. The spiramen is inconstant; it is almost as large as the apertura. Genotype.—Gigantopora lynchoides Ridley, 1881. Range.—Jacksonian-Recent. Genus GEPHYROPHORA Busk, 1884. 1884. Gephyrophora Busk. Report on the Polyzoa collected by H. M. S. Challenger, pt. 1, p. 67. The apertura nears a proximal rimule. The frontal is a tremocyst. Genotype.— Gephyrophora polyniorpha Busk, 1884. Range.—Tongrian-Recent.
EAELY TEHTIAEY CTTETLOSTOME BRYOZOA. 59 Genus TESSARADOMA Norman, 1868. 1SG8. Tcssamdoiiia Norman, Report 3Sth Meeting, British Association for the Advancement of Science, p. 309. The apertura is provided with cardelles. The frontal is surrounded by areolae and covered by a pleurocyst. The spiramen opens at the level of the operculum. The operculum in opening closes the spiramen. Genotype.—Tes.'
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Bulletin - United States National Museum - Smithsonian Institution

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