470 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



area into two parts, is provided with a short, proximally directed process. The 

 subopercular area, which is turned toward the aperture, has a transversally oval 

 opening." 1 



This is a very unusual type of avicularium which well characterizes this fossil 

 species. 



Occurrence. Middle Jacksonian: Wilmington, North Carolina (common): 

 Eutaw Springs, South Carolina (rare) ; Near Lenuds Ferry, South Carolina (rare). 



Cotypes.Vrt.. No. 64154, U.S.N.M. 



SMITTINA (?) PUPA, new species. 



Plate 95, figs. 1-9. 



Description. The zoarium is subcylindrical, hollow, bifurcated, unilamellar, 

 or plurilamellar. The zooecia are long, distinct, fusiform, or elliptical ; the frontal 

 is convex, smooth, bordered by a line of large rather widely spaced areolae. The 

 peristome is thick, salient; the peristomice is suborbicular ; the apertura is oblique 

 and semilunari The ovicell is orbicular, little salient, ornamented by some large 

 irregular pores. On the line of the areolae, there are two small, salient avicularia. 

 with pivot, orbicular more or less symmetrically disposed. 



,, T. . , f A;;>e=0.15 mm. . f Z3=0.75-0.85 mm. 



Measurements. Peristomice ,' n -m n -, Zooecia^, _ 



| ^e=0.12-0.15 mm. | fe=0.35 mm. 



Affinities. This species is unprovided with lyrula and the median avicularium 

 is rarely visible; we must doubt its place in the genus Smittina. Nevertheless the 

 other functions, ovarian and calcification are identical. It is remarkable to note 

 that the larger the areolae are, the less numerous they are. The lateral avicularia 

 always replace one of these areolae. 



This species differs from. Smittina tubidata Gabb and Horn, 1862, in the 

 presence of two lateral avicularia and in the absence of median avicularium. In 

 practice, the distinction between the two species is often difficult; there are many 

 specimens of Smittina tubulata which resemble S?nittina pupa. 



On account of the size of the zoarium. this is a well characterized fossil. 



Occurrence. Vicksbnrgian ("Chimney rock" of Marianna limestone): One 

 mile north of Monroeville, Alabama (very common). 



Cotypes.Cat. No. 64307, U.S.N.M. 



SMITTINA TUBULATA Gabh and Horn, 1862. 



Plate 94, figs. 1-11. 

 1862. Semieschara tubulata GABB and HORN, Monograph of the fossil Polyzoa of the 



Secondary and Tertiary formations of North America, Journal Academy Natural 



Sciences, Philadelphia, ser. 2, vol. 5. p. 122, pi. 19, fig. 5. 

 1890. Semiesehara tubulata DEGKEGOKIO, Monographic de la Faune Eocenique cle 1'Ala- 



bama et surtout de celle de Claiborne de 1'Etage Parisien, Annales de Geologie 



et de Paleontologie, Livraisons 7 and S, p. 242, pi. 40, figs. 8, 24-28. 



Description. The zoarium is cylindrical, hollow, tubular, uni or plurilamellar ; 

 it incrusts small algae. The zooecia are large, long, elliptical, or tubular; the 



1 I/vlnsen, Morphological and Systematic Studies on the Cheilostomatous Bryozoa, p. 342, pi. 18. fig. 12. 



