658 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Measurements. . 



Diameter of tube 0.24-0.30 mm. 



Length of tube 0.70-0.80 mm. 



Length of peristome 0.16-0.20 mm. 



Length of peristomie 0.20 mm. 



Affinities. This species may be confused with Stomatopora pratti in its gen- 

 eral size. It differs from it in the smallness of the angle of divergence of the 

 branches and in its zooecial width which is never more that 0.30 mm. 



Occurrence. Middle Jacksonian: Near Lenuds Ferry, South Carolina (rare) ; 

 Wilmington, North Carolina (rare). 



Upper Jacksonian (Ocala limestone) : Alachua, Florida (very rare). 



CotypesC&i. Nos. 65269, 65270, U.S.N.M. 



STOMATOPORA FASCIOLATA, new species. 

 Plate 116, figs. 10, 11. 



Description.- The zoarium incrusts bryozoa. forming irregular rectangles. 

 The tubes are oval, very wide, often ornamented with salient, transverse bands. 

 The peristome is thin, round, somewhat oblique, salient. 



Diameter of tube 0.50 mm. 



Measurement*. Length of tube 0.70-1.00 mm. 



Diameter of peristome 0.2-1 mm. 



Affinities. The large species is clearly characterized by its zooecial width, 

 which is much greater than that of Stomatopora pratti. The transverse bands are, 

 moreover, very inconstant. 



Occurrence. Upper Jacksonian (Ocala limestone) : Old Factory, about 1 

 miles above Bainbridge, Georgia (very rare). 



Holotype.Gat. No. 65273, U.S.N.M. 



Forma PROBOSCINA Audouin, 1826. 



1826. Proboscina AUDOUIN, Explication sommaire des planches de Polypes de 1'Egypte 

 et de la Syrie. ... In Savigny's Description de 1'Egypte. Histoire Naturelle, 

 vol. 3, p. 236. 



The zoarium consists of multiserial elongate bands, which may be simple or 

 branched, and are always flat and adnate. The zooecia are cylindrical and narrow. 

 The peristomes are flush with the surface of the zoarium, or slightly raised; and 

 they are usually distributed irregularly, but are occasionally quincuncial or in trans- 

 verse linear series. 



Range. Ordovician Kecent. 



Historical. Proboscina boryi Audouin, 1826, was the first species of this genus 

 and has been quoted as the genotype, although the genus Proboscina has never 

 been considered as more than a multiserial Stomatopora. Numerous species rang- 

 ing from the Middle Ordovician to the Recent have been referred to the genus and 



