AMERICAN SPECIES OF ORTHOPHRAGMINA AND LEPIDOCYCLINA. 



47 



Orthophragmina mariannensis Cushman var. papillata 

 Cushman. 



Plate XI, figure 2. 



Orthophragmina mariannensis Cushman var. papillata 

 Cushman, U. S. Geol. Survey Prof. Paper 108, p. 

 117, pi. 43, fig. 1; pi. 44, 1917. 



Variety differing from the typical form of 

 the species in the much more prominent, 

 higher ribs, which are semicyhndrical and 

 very strongly papillate; number of ribs also 

 slightly greater than in the typical form; a 

 few specimens have 8, but 9 to 12 or even 16 

 ribs are more common. 



The type station for this variety is the same 

 as that for the species, station 6768. It was 

 also recorded from stations along the Flint 

 River in Georgia. Additional records for tliis 

 variety are as follows: 



7130. East b?nk of Flint River, 6 miles above Bain- 

 bridge, Decatur County, Ga.; C. W. Cooke and J. E. 

 Brantly, collectors; a single very typical specimen. 



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- 

 belltonroad, Jackson County, Fla.; C. W. Cooke, collector. 



Orthophragmina vaughani Cushman. 



Plate XI, figure 3. 



Orthophragmina vaughani Cushman, U. S. Geol. Survey 

 Prof. Paper 108, p. 118, pi. 43, figs. 4, 5, 1917. 



Test flattened, small, 8 to 10 millimeters in 

 diameter, quadrate or octagonal in outline, 

 stellate; main ornamentation consisting of a 

 central raised umbonate portion with four 

 radiating raised areas to the main angles of 

 the test, broad and rather low, about halfway 

 to the periphery considerably increasing in 

 height and width, finely papillate toward the 

 center, much more coarsely so toward the 

 periphery; intermediate spaces much de- 

 pressed, with a smooth U-shaped area near 

 the inner angle next to the raised portions; the 

 peripheral part raised and strongly papillate, 

 the peripheral portion of this raised area at the 

 margin strongly convex or even bluntly angled. 



The ornamentation of this species is unique. 

 It is evidently a rare species, being known only 

 from the type locality, U. S. G. S. station 3387, 

 Ocala limestone at Red Bluff, on Flint River 

 7 miles above Bainbridge, Decatur County, 

 Ga. ; T. W. Vaughan, collector. 



Orthophragmina americana Cushman. 



Plate XI, figure 4. 



Orthophragmina americana Cushman, IT. G. Geol. Survey 

 Prof. Paper 108, p. 116, pi. 40, fig. 4; pi. 41, fig. 1; 

 pi. 42, fig. 1. 



Test large, flattened; peripheral margin with 

 a series of projecting angles corresponding to 

 the peripheral terminations of the radiately 

 arranged raised ornamentation or thickenings; 

 peripheral margin between the projecting 

 angles very thin; central region with a thick- 

 ened umbo 2 millimeters or more in diameter, 

 from which radiate the raised riblike areas to 

 the peripheral angles; these ribs high and nar- 

 row at their inception, lower and wider as they 

 approach the periphery; ribs up to 20 in num- 

 ber; some starting from the umbo, others 

 initiated later, arising independently in the 

 intermediate areas, usually not symmetricall}" 

 placed; surface comparatively smooth; sur- 

 face indications of pillars usually inconspicuous 

 or lacking. 



In vertical section the equatorial chambers 

 are rectangular, the area of the raised radial 

 portions consisting of more mmierous lateral 

 chambers in the columns, curvhig about the 

 axis at the rib at either side, those of the inter- 

 mediate depressed areas parallel with the equa- 

 torial layer and few in number. 



In horizontal section the equatorial chambers 

 are rectangular, four or five times as long as 

 wide, those of the axis of the radial portions 

 narrower than those of the intermediate de- 

 pressed areas. 



The type locality for the species is U. S. G. S. 

 station 6768, Ocala limestone on Chipola River 

 at wagon bridge a quarter of a mile east of 

 Marianna, Fla.; No. 1 of section; C. W. Cooke, 

 collector. Another station is 3387, Ocala lime- 

 stone at Red Bluff, on Flint River 7 miles 

 above Bainbridge, Decatur County, Ga. ; T. W. 

 Vaughan, collector. Other specimens came 

 from station 8259, Ocala limestone about 6 

 miles southeast of Campbellton and 12 miles 

 northwest of Marianna, on road to Cottonwood, 

 Ala.; half a mUe from its intersection with 

 the Marianna-Campbellton road, Jackson 

 County, Fla.; C. W. Cooke, collector. 



This is a fine species, one of the largest of the 

 genus. 



