186 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Occurrence. Middle Jacksonian: Near Lenuds Ferry, South Carolina (very 

 rare). 



Geological di** r'/lmttoii. Priabonian of Vicentin. Italy (Eeuss, Waters), and 

 possibly in the Bupelian of Gaas, France (Eeuss). 



PUsiotype.CAi. Xo. 63952, U.S.X.M. 



SCRUPOCELLARIA COOKEI, new species. 



Plate 81, figs. 6-8. 



Description. The segments of this new species carry at a maximum 10-12 

 zooecia arranged alternately. The zooecia are distinct and elliptical; their mural 

 rim is rounded, and bears a very small distal rounded avicularium, without a pivot ; 

 the frontal avicularium is larger and elliptical. On the dorsal side the zooecia are 

 distinct and convex; the vibraculum is almost straight, pointed, and bears a small 

 groove and a small radicular pore. 



. (Ao=0.2S mm. . \Lz=QA2 mm. 



Measurements. Upesia , Zooecia, A00nn/ , 



[Io=0.l2 mm. \rs=0.22-Q.2Q mm. 



Affinities. This species is distinguished from Scrupocellana elUpfica Reuss. 

 1869, by its greater breadth and its straight vibraculnm. From fi. f/rfifiUs it 

 differs in its greater micrometric dimensions, the constancy of the frontal avicu- 

 larium and the larger vibraculum; from >>. //iHin'ri by its smaller dimensions and 

 straighter and much smaller frontal avicularium. We have not found the pore 

 or the pit indicating the presence of the scutum on any of the specimens, nor can we 

 explain the meaning of the distal lamella observed in some opesia (fig. 6). 



This fine species is dedicated to Dr. C. Wythe Cooke, of the United States 

 Geological Survey, to whose painstaking efforts through several field seasons we 

 are indebted for much of our choicest material from the Jacksonian and Vicks- 

 burgian of the Southern States. 



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

 south of Jackson, Alabama (common). 



Vicksburgian (Red Bluff clay), 7 miles southwest of Bladen Springs, Alabama 

 (very rare). 



Vicksburgian (By ram marl) : Near Woodward, Wayne County. Mississippi 

 (rare). 



Holotype.Cat. No. 61237, U.S.X.M. 



SCRUPOCELLARIA MILNERI, new species. 



Plate 81, figs. 9-16. 



Description. The segments in this species are large and bear at a maximum 

 10-12 alternating zooecia. The zooecia distinct and elliptical; their mural rim 

 rounded and bearing- an inconspicuous distal avicularium, without pivot. The 

 frontal avicularium is very large, oblique, acuminate, without pivot or denticle. On 

 the dorsal the zooecia are a little convex; the vibraculum is oblique, rather large, 

 and bears a quite distinct, prominent groove and a large radicular pore situated on a 



