Measuremen ts. 



NORTH AMERICAN EARLY TERTIARY BRYOZOA. 821 



salient and striated concentrically on the basal lamella. The central area is very 

 large. The fascicles are salient, regular, from 18 to 22 in number, continued 

 almost to the zoarial margin, monoserial. The tubes are rectangular, smaller than 

 the cancelli and without visor. The cancelli are large and polygonal. 



Diameter of the cancelli 0.12 mm. 



Diameter of the tubes 0.10 mm. 



Diameter of the zoaria 3.00 mm. 



Affinities. There is in the Oligocene a species very close to HeteroporeUa 

 de/oj^mi-s Reuss, 1847, but in which the central area is much smaller. This species 

 was refigured in 1877 by Manzoni with very different characters from the figure 

 by Reuss. 1864, not cited, moreover, in the synonymy. On the other hand, Stoliczka, 

 1861. having found the species of Reuss. 1847, in the Lower Oligocene of Latdorf, 

 its discovery in the Vicksburgian is not unexpected. Our specimens are much like 

 the figures of Lichenopora prolifera by Reuss and Manzoni, and our identification 

 appears to be good. 



Neviani cited this species in the Pliocene and in the Quarternary. Perhaps 

 he confused it with Lichenopora rafdafa Savigny-Audouin, 1826, although dis- 

 tinction between the two species ought to be easy to determine. 



Occurrence. Vicksburgian (Marianna limestone) : Salt Mountain. 5 miles 

 south of Jackson, Alabama (rare). 



Geological distribution. Latclorfian of Germany (Stoliczka) ; Helvetian of 

 Italy (Neviani) ; Tortonian of Austria-Hungary (Reuss) ; Astian of Italy 

 (Neviani). 



Plesiotypcs.Cat. No. 65473, U.S.N.M. 



LICHENOPORA GOLDFUSSI Reuss, 1864. 



Plate 162, figs. 8-20. 



1847. Defrancia stcJlata REUSS, Die fossilen polyparien cles Wiener TertTarbeckens, Hai- 

 dingers" naturwissenschaftliche Abhandlungen, vol. 2, p. 37, pi. 6, fig. 2. (Not 

 Goldfuss, 1827.) 



1864. Radioporfi goldfussi REUSS, Zur fauna cles cleutschen Oberoligocans, Sitzungsbericlite 



der k. Akademie der Wissenschafteu. AVien, vol. 5, p. 676 (sep. 65.) 



1865. Radiupora goldfussi RETTSS, t'eber die Foraminiferen imd Bryozoeu des deutschen 



Septa rienthones, Denkschriften der k. Akademie der Wissenschaften, AVien, vol. 2.~>, 

 p. 84, pi. 10, figs. 11, 12. 



1877. Defrancia steUata MANZONI, I Briozoi fossili del Miocene d'Austria ed Ungheria, 

 Denkschriften der k. Akademie der Wissenschaften, Wien, vol. 37, p. 16, pi. 16, fig. 63. 



Description. The zoarium is simple, discoidal, very convex ; the lower face 

 is very concave and striated concentrically. The fascicles are salient, regular, tri- 

 serial, complete almost to the zoarial margins ; the central area is small. The tubes 

 are a little smaller than the central cancelli. They are polygonal and deprived of a 

 visor. The cancelli are large, polygonal, and without spinule. 



Diameter of the tubes . 0.10 mm. 



Diameter of the cancelli 0.10-0.14 mm. 



M, asurements Di ame{er O f the large zoaria 8.00 mm. 



Width of the fascicles.- _ 0.30-0.40 mm. 



