AMERICAlsr SPECIES OF ORTHOPHRAGMINA AND LEPIDOCYCLINA. 



71 



than the width, walls thick and at right angles, 

 not showing the convexity of the outer wall so 

 common in most species; lateral chambers 

 seven or eight in a column in the thickened cen- 

 tral portion, broad and low, the outer wall usu- 

 ally convex, making the chamber cavity 

 roughly lunate, the walls of the inner chambers 

 nearest the equatorial chambers often much 

 thickened and the chamber cavity reduced to 

 mere slits, the walls often double the thickness 

 of the entire equatorial band at that point, the 

 walls of the outer layers much thinner and the 

 chamber cavities somewhat wider but not pro- 

 portionately so ; pillars very numerous, more or 

 less irregular, often anastomosing, especially 

 toward the surface. 



Type specimen from the Jackson formation 

 at U. S. G. S. station 2638, bluff at Mont- 

 gomery, Grant Parish, La.; T. W. Vaughan, 

 collector, 1894. The species is represented 

 by abundant specimens from the marl at 

 this place. The same species was collected 

 at station 4270, at the same locality, by T. W. 

 Vaughan, in 1900. Very similar specimens 

 occur at the following stations: 



7161. Ocala limestone, roadside 500 feet east of Jones 

 Field Branch, sec. 35, T. 8 N., R. 3 E., 5 miles southeast of 

 Whatley, Ala. ; C. W. Cooke, collector. 



7377. Jackson formation, bluff on south side of Suck 

 Creek, Clarke County, Miss., about three-quarters of a mile 

 from mouth (in the NE. i sec. 3, T. 10 N., R. 7 E., in 

 "Zeuglodon bed "; E. N. Lowe and C. W. Cooke, collectors. 



Both microspheric and megalospheric forms 

 of the test occur. The pillars are peculiar in 

 their anastomosing condition and are shown in 

 the horizontal section (PI. XXVII, fig. 3). 



Lepidocyclina ocalana Cushman, n. sp. 



Plate XXVIII, figures 3, 4; Plate XXIX, figures 1-3. 



Test of medium size, flattened, usually 

 slightly seUaeform; usual diameter of speci- 

 mens from 16 to 18 millimeters, with the range 

 of adiilt specimens from 15 to 21 millimeters; 

 the two sides of the tests differing; one side 

 typically prominently umbonate in the central 

 portion, thence gradually sloping to the pe- 

 riphery; the opposite side thickened in the center 

 but not umbonate, evenly curved from one side 

 to the other; the umbonate side showing more 

 clearly the seUaeform shape than the more 

 evenly curved side; surface typically smooth or 

 somewhat scrobiculate from unequal erosion 

 of the outer layer of lateral chambers. 



The horizontal section shows the chambers 

 of the equatorial band usually with the outer 

 portion of each chamber convexly curved, on 

 the whole hexagonal, walls comparatively 

 thick, thinner near the periphery; anntili irregu- 

 lar; embryonic chambers subequal, thick- 

 walled. 



In vertical section the chambers of the equa- 

 torial zone increase but very slightly in height 

 toward the exterior; lateral chambers much 

 compressed, broad and very low, from 15 to 20 

 ia a vertical column in the umbonal region but 

 rapidly diminishing in ntunber toward the pe- 

 riphery. Pillars very numerous, more so in the 

 central region but well distributed throughout 

 the test except at the peripheral portion, in 

 section wedge-shaped, distal end broadest, 

 thence tapering gradually to the center, usu- 

 ally showing longitudinal laminations in sec- 

 tion, outer end flat or very slightly convex, not 

 coming above the adjacent lateral chambers 

 and therefore not causing a papillate surface, 

 as is so usual with a species in which the piUars 

 are numerous; in some specimens the pillars 

 seem to become obsolete before the surface is 

 reached. 



Type specimen from U. S. G. S. station 6804, 

 Ocala limestone, quarry No. 1, Florida Lime 

 Co., Ocala, Fla. ; C. W. Cooke, collector. Tests 

 of this species have been found also at the 

 following stations : 



322. Quarry of chimney rock near railroad half a mile 

 west of Gainesville, Fla.; L. C. Johnson, collector. 



329. U. S. N. M. catalogue No. 136397, Fort White, Fla.; 

 L. C. Johnson, collector. 



355. Bennett's bone bed, Nixon, Levy County, Fla.; 

 L. C. Johnson, collector. 



362. Fort White railroad station, Suwannee County, 

 Fla.; L. C. Johnson, collector. 



365. U. S. N. M. catalogue No. 136425, Johnson's lime 

 sink. Levy County, Fla.; L. C. Johnson, collector. 



378b. Near the "sink" 2 miles south of Gainesville, 

 Fla.; L. C. Johnson, collector. 



380. Vicinity of Gainesville and Arredonda, Alachua 

 County, Fla.; L. C. Johnson, collector. 



2284. Martin station, Marion County, Fla.; W. H. Ball, 

 collector, 1891. 



2325. Fort White, Columbia County, Fla. 



3629. Alachua, Fla.; T. W. Vaughan, collector. 



3682. Six miles southwest of Gainesville, Fla.; 

 Weatherby, collec'cor. 



3683. Archer, Fla.; W. H. Ball, collector. 



3685. Martin's station, Fla.; W. H. Dall, collector. 



3688. Richard's quarry, Ocala, Fla.; Joseph Willcox, 

 collector. 



3781. Bank of AUapaha River, Statenville, EchoUs 

 County, Ga.; S. W. McCallie, collector. 



