30 BULLETIN 96, UNITED STATES NATIONAL MUSEUM. 



The aviculariiim is interzocccial, smaller than the zoa>cia, losange- 



shaped, Avith a small distal canal and a round opesium. 



,, ^ r^ ■ {ho=0.12 mm. 



Measurements. — UpesmmL -^_ /-it -i • ^ \ 



^ |7o=0.16 mm. (incmamg the opesmles). 



,, . , . (Lb=0.50 mm. 



Marginal zooecia , ^ „„ 



^ p=0.30 mm. 



Very often the proximal border of the opesium is simply undu- 

 lated and the opesiules are visible only on account of the opesiular 

 teeth. The opesia of the ovicelled zooecia seem a little larger than the 

 others. 



Occurrence. — Upper Jacksonian; West bank of Sepulga River, 

 Escambia County, Alabama (rare). 



Type.—Q^i. No. G2585, U.S.N.M. 



Subfamily LuNULARiiDAE Levinsen, 1909. 



Genus LUNULARIA Busk, 1884. 



1884. Lunularia Busk, Report on Polyzoa collected by Challenger, Clieil- 

 ostomata, vol. 10, pt. 30, p. 208. 



The zoarium has the Lunulites form. The avicularia are sym- 

 metrical. Exteriorly and interiorly the zooecia are arranged in radial 

 rows. The cryptocyst is more or less developed. Both radicular and 

 hydrostatic zooecia are present. The ovicell is endozocecial. 



Genotype. — Lunulites capulus Busk, 1884. 



Range. — Cenomanian-Recent. 



Lunulites Lamarck, 1812, is not a definite generic type, but is 

 merely a zoarial form adopted for certain reasons. This style of 

 growth obtains in many genera of cheilostome bryozoa, e. g. Otio- 

 nella and Trochopora in the Anasca Malacostega; Lunularia and 

 Selenaria in the Anasca Coilostega, and Stichopora^ Fedora^ and 

 Bipora in the Ascophora. 



Thirteen species of Lunularia represented in many cases by abun- 

 dant specimens are known in the Lower Tertiary strata of the United 

 States. Of these only five, L. reversa Ulrich, 1901, Z. distans Lons- 

 dale, 1845, L. fenestrata DeGregorio, 1890, L. vickshurgen^is Conrad, 

 1847, and L. contigua Lonsdale, 1845, are described. 



Family ASPIDOSTOMIDAE Canu, 1908. 



The zooecia have a raised margin, often indistinctly or incom- 

 pletely developed. The two opesiules appear as narrow incisions, 

 which join the zocecial aperture; the short polypide tube, which is 

 not continued under the cryptocyst cover, is in most cases provided 

 with marginal flanges. Avicularia are always present. Ovicells are 

 hyperstomial. 



