468 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



SMITTINA TELUM, new species. 

 Plate 93, figs. 1-9. 



Description. The zoarium is free, cylindrical, hollow, unilamellar; it incrusts 

 the small roots of algae. The zooecia are distinct, elongated rectangular ; separated 

 by a salient thread ; the frontal is convex, bordered by a line of large areolae and 

 almost entirely occupied by an enormous avicularium. The apertura is semilunar, 

 somewhat transverse with a very little convex, proximal border; the peristomice 

 is not deformed by the avicularium; there is no lyrula apparent; the peristome 

 little salient in its distal part, is ornamented laterally with two large, smooth, 

 salient lips. The ovicell is globular, salient; it is formed of a fragile and porous 

 area surrounded by a little prominent collar ; it is hyperstomial and opens into the 

 peristomie. The avicularium is gigantic, salient, triangular like a dart, with pivot, 

 the beak directed toward the bottom. 



Aa=0.10min. . f 2=0.60-0.90 mm. 



Zooecia {fe=:0.3iM).4() mm. 



Variations. The median avicularia are not always constant in size; one may 

 follow their successive development on figures 1 to 7. The lateral lips of the 

 peristome are small (fig. 2) or very large (fig. 4) ; they may even be wanting 

 (fig. 5) or be joined with the avicularium (fig. 4). The ovicells are smooth (fig. 6) 

 or granular (fig. 7), according to the fineness of the grains of the pleurocyst. In 

 the interior (fig. 8) the olocyst is perforated by very small areolar pores which are 

 nevertheless very large exteriorly. A lyrula does not appear to be present. 



The tangential section (fig. 9) indicates that the avictilarian chamber is rather 

 small and that it is the same as the one which covers the frontal of the zooecium. 

 The white line which surrounds the zooecium and the size of the areolae indicate 

 that this section has been made superficially at the level of the interareolar costules. 



Affinities. This species with its giant avicularium is very close to Smittina 

 canavarii Neviani, 1900, of the Sicilian of Italy. It differs from it in the absence 

 of lyrula, in the narrower zooecia, and in the larger number of areolae. 



In its zoarial form of a hollow cylinder it approaches somewhat Smittina 

 cophia, but S. telum differs in the presence of the gigantic avicularium. 



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

 mile north of Monroeville, Alabama (very common). 



Cotypes.Cat. No. 64299, U.S.N.M. 



SMITTINA GRANULOSA, new species. 



Plate 92, figs. 19, 20. 



Description. The zoarium is cylindrical and hollow. The zooecia are 

 elongated, distinct, fusiform; the frontal is convex and formed of a very finely 

 grantilose pleurocyst The peristome is salient, thin, sharp; its anterior cleft con- 

 tains a small elliptical avicularium; the apertura (interior) is semilunar. The 

 ovicell is globular, salient; it is formed of a finely granular area, surrounded by 

 a small improminent collar; it is hyperstomial, placed on the distal zooecium and 



