64 BULLETIN 96, UNITED STATES NATIONAL MUSEUM. 



forms are frequent in the same region. However, Waters discovered 

 in the Priabonian of the Vicentin ^ two species having some affinities 

 with this family; namel}'' Catenicella septentrional is Waters 1891, 

 and C. continua Waters, 1891. According to Waters^ the latter 

 species is a Vittaticella and the first belongs to a new genus. 



The single and unique fragment found in America is very close 

 to Catenicella 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 avicuhirinm. 



Occurrence. — Vicksburgian ; Salt Mountain, 5 miles south of Jack- 

 son, Alabama. (Very rare.) 



Type.— Cat. No. 62601, U.S.N.M. 



Family ADEONIDAE Jullien, 1903. 



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

 spines and oral glands. The areolae are always closed and exca- 

 vated 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 con- 

 tain an ovicell sac in which the embryo is developed. The septulae 

 are numerous, placed in linear rows, arranged to correspond to the 

 areolae. The avicularia are frontal or interzocecial ; the latter have 

 no pivot. 



Genus MENISCOPORA Gregory, 1893. 



1893. Mcuiscopora Gregory. British Palaeogene Bryozoa, Transactions 

 Zoological Society of London, p. 250. 



The zooecia are trimorphic. The normal axial zooecia have an 

 external aperture straighter than that of the marginal zoof-cia; the 

 aperture is formed of a semilunar anterior and of a very concave 

 posterior part. The gonoecia are larger than the ordinary zooecia 

 and their aperture is of different form. The peristomie is of slight 

 depth. Interzooecial avicularia are rare. Certain lateral areolae 

 are transformed into small frontal avicularia. 



Genotype. — Meniscopora higihhera Gregor}^, 1892. 



Range. — Thanetian-Helvetian. 



Meniscopora {Lepralia) suhplana Ulrich, 1901, from the Lower 

 Eocene (Aquia) of Maryland and one new species from the Vicks- 

 bui-gian of Mississippi represent this genus in the United States. 



^ North Italian Bryozoa, Quarterly Journal Geological Society London, vol. 47, 1891, 

 p. 5, pi. 1, ligs. 1-8. 



2 Marine Fauna Zanzibar, Proceedings Zoological Society London, 1913, p. 483, 



