550 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



"Zoarium continuous, radicate, branched, branches alternate, subcylindrical 

 quadriserial, subsecund. Zooecia completely immersed below, flattened in front. 

 Peristome tubular, extended. A circular median pore below the middle of the front. 

 A large circular orifice (avicularian?) near the top of most of the lateral zooecia 

 behind." 



Genotype and only species. Siphonicytara scrrulata Busk, 1884. Recent, East 

 Indies. 



Family CATENICELLIDAE Busk, 1852. 



Genus CATENICELLA D'Orbigny, 1852. 



CATENICELLA SUBSEPTENTRIONALIS Canu and Bassler, 1917. 



Plate 96. fig. 11. 



1917. CateniceUa siibseptentrionaUs CANIT and BASSLER, Synopsis of American Early Ter- 

 tiary Cheilostome Bryozoa. Bulletin 96, United States National Museum, p. 63, pi. 5. 

 fig. 5. 



The Catenicellidae are bryozoa peculiar to the southern hemisphere. They 

 abound in the recent seas off Australia, and their fossil forms are frequent in the 

 same region. However, Waters * discovered in the Priabonian of the Vicentin two 

 species having some affinities with this family ; namely, CateniceUa septentrionalis 

 Waters, 1891, and CateniceUa continua Waters, 1891. According to Waters 2 the 

 latter species is a Yittaticella and the first belongs to a new genus. 



The single and unique fragment found in America is very close to CateniceUa 

 septentrionalis Waters, 1891. It differs from it in its somewhat larger micrometric 

 dimensions, more closely arranged frontal pores and in the presence of a small, 

 oral avicularium. 



Occurrence. Vicksburgian : Salt Mountain, five miles south of Jackson, Ala- 

 bama (very rare). 



Holotypc.Cat. No. 62601, U.S.N.M. 



Family ADEONIDAE Jullien, 1903. 



Bibliography (Anatomical). 1SS9 1 . WATERS, Bryozoa from New South Wales, Annals Magazine 

 Natural History, sei 1 . 6. vol. 4, pi. 1, fig. 5. 1903. JULLIEN, Bryozoaires provenant des campagnes 

 de I'HironcleUe, pi. 14, fig. 4. 1912. WATERS, A structure in Adeonella (Laminopora) contorta 

 Michelin, with remarks on the Adeonidae, Annals Magazine Natural History, ser. 8, vol. 9. 

 p. 400, pis. 10 and 11. 1913. WATERS, The Marine Fauna of Zanzibar, Proceedings of the 

 Zoological Society of London, pi. 73, figs. 1-8. 1909. LEVINSEN, Morphological and Systematic 

 Studies of the Cheilostornatous Bryozoa, p. 282. pi. 14, figs. 1-5 ; pi. 23, fig. 9. 



The zooecia are provided with a compensatrix, but are devoid of spines and 

 oral glands. The areolae are always closed and excavated out of the wall substance 

 itself. The frontal is composed of an olocyst covered by a very thick pleurocyst. 

 The operculum opens at the bottom of a peristomie. The female zooecia are of the 

 kind termed gonoecia and are often larger than the others; they contain an ovicell 



'North Italian Bryozoa, Quarterly Journal Geological Society. London, vol. 47, 1891, p. 5, pi. 1, figs. 1-8. 

 * Marine Fauua Zanzibar, Proceedings Zoological Society. London. 1913, p. 483. 



