AMERICAN" SPECIES OF OBTHOPHRAGMINA AND LEPIDOCYCLINA. 



61 



either hexagonal or with the peripheral angle 

 changed to an eVen convex curve; walls of me- 

 dium thickness; annuli irregular. 



In vertical section (PI. XVI, fig. 1) the equa- 

 torial chambers increase in height toward the 

 periphery, where they are at least four times 

 as high as their diameter; lateral chambers 

 compressed, broad and low in the central 

 region with as many as 20 chambers in each 

 column but soon diminishing in number 

 toward the periphery of tlie test, the outer 

 third of the region with but one to three 

 chambers superimposed, the thin test being 

 made up largely of the higli equatorial cham- 

 bers; pillars mostly in the umbonal region, 

 thence gradually decreasing in number toward 

 the periphery of the test; in section, narrow 

 wedge-shaped, the distal end broadest and 

 somewhat convex, gradually tapering toward 

 the proximal end, usually showing longitudi- 

 nal laminations in section, in some specimens 

 with the greatest width in the central region 

 and thinning again toward the periphery. 



Tj]ie specimen from U. S. G. S. station 

 7097, Ocala limestone, on the east bank of 

 Flint River above the old factory at bend 

 three-quarters of a mile northeast of the Atlan- 

 tic Coast Line Railway station at Bainbridge, 

 Ga.; C. W. Cooke and W. C. Mansfield, col- 

 lectors. It has also been collected in the 

 Ocala limestone at the following stations: 



3387. Red Bluff, on Flint River 7 miles above Bain- 

 bridge, Ga.; T. W. Vaughan, collector. 



7099. East bank of Flint River about half a mile above 

 Red Bluff, Decatur County, Ga. ; C. W. Cooke, collector. 



8259. About 6 miles southeast of Campbellton and 12 

 miles northwest of Marianna, on road to Cottonwood, Ala., 

 half a mile from its intersection with the Marianna-Camp- 

 bellton road, Jackson County, Fla.; C. W. Cooke, col- 

 lector. 



At all four of these stations L. georgiana 

 is accompanied by OrthopTiragmina georgiana 

 Cushman. At station 8259 a single specimen 

 was noted, not weU characterized but referred 

 here provisionally. 



Specimens of L. georgiana occur at the 

 following stations: 



3382. Hales Landing on Flint River, 7 miles below 

 Bainbridge, Ga.; T. W. Vaughan, collector. 



3383. Blue Springs, Ga.; exterior molds of specimens 

 apparently L. georgiana; T. W. Vaughan, collector. 



3390. Below Plant System wharf, Bainbridge, Ga., 

 T. W. Vaughan, collector. 



3397. Back of old factory about 1^ miles above Bain- 

 bridge, Ga. (same locality as station 7097); T. W. Vaughan, 

 collector. 



4974. West side of St. Andrews Bay Road, southwest of 

 Chipley, Fla.; G. C. Matson, collector. 



7082. Hales Landing, west bank of Flint River 7 miles 

 southwest of Bainbridge, Ga. ; T. W. Vaughan, G. W. Cooke, 

 and W. C. Mansfield, collectors. 



7126. East bank of Flint River at Dry Bread Shoals, 

 Mitchell County, Ga., 8^ or 9 miles below Newton, 

 from lumps blasted from the channel; C. W. Cooke, col- 

 lector. 



7130. East bank of Flint River 6 miles above Bain- 

 bridge, Ga. ; C. W. Cooke and J. E. Brantly, collectors. 



7149. East bank of Flint River below wagon bridge at 

 Bainbridge, Ga.; W. C. Mansfield, collector. 



8331. Old gristmill on Aycock Creek, 100 yards above 

 crossing of Twilight Road, 3 miles southwest of Boykin 

 station. Miller County, Ga.; C. W. Cooke, collector. 



In the region about Marianna, Fla., L. 

 georgiana occurs at the following stations: 



7194. Ocala limestone, soft cream-colored limestone, 

 bed 4 of section, at mouth of cavern 200 yards southwest 

 of wagon bridge over Chipola River east of Marianna, Fla. ; 

 C. W. Cooke and W. C. Mansfield, collectors. In this part 

 of the section it occurs with other typical Ocala species 

 of Lcpidocyclina. 



7195. Bed 5 of same section, white limestone, apparently 

 has this species. 



7199. Same locality, contact of beds 4 and 5; W. C. 

 Mansfield, collector. 



Si^ecimens from station 7242, bottom of 

 bed 5 of section on west bank of Chipola River 

 at wagon bridge half a mile east of Marianna, 

 Fla., collected by W. C. Mansfield, are appar- 

 ently L. georgiana but are not sufficiently 

 well characterized to make the determination 

 absolute. An interesting assemblage, among 

 which are specimens tliat may be referred to 

 L. georgiana, was found at station 7672, on 

 Chipola River at Louisville & Nashville Rail- 

 road, three quarters of a mile east of Mari- 

 anna, Fla., by C. W. Cooke. 



This is the large species referred to in the 

 literature on Georgia, especially as Orbitoides 

 papyracea, mainly on earlier identifications of 

 R. M. Bagg, jr. The 0. papyracea of later 

 authors following Giimbel and Boubee is really 

 an OrtTiophragmina, for which the name 0. 

 pratii Michelui must be used according to 

 Sclilumberger. Our material is Lepiclocyclina, 

 and the name Q. papyracea as used in the litera- 

 ture in references to the following places should 

 be L. georgiana Cushman: Albany, Ga., west 

 end of wagon bridge ^ ; limestone at Red Bluff, 



1 Vaughan, T. W., in Veatch, Otto, and Stephenson, L. W., Georgia 

 Geol. Survey Bull. 26, p. 317, 1911. 



