FORAMINIFERA OF THE MINT SPPJNG CALCAREOUS MAEL. 



127 



ery broadly rounded. Length slightly more 

 than 1 millkneter. 



Type specimen from station 6647, Chicka- 

 sawhay River IJ miles southwest of Boicc, 

 Miss. 



This is a very peculiar species which at first 

 glance would be taken for the yoimg of Fron- 

 (liciilaria, but a further study shows that the 

 chambers are alternating throughout, as in 

 Boliviim; in some respects it remotely re- 

 sembles B. fiemialata Bagg, which occurs off 

 the Hawaiian Islands. 



Genus VERNETTILINA DOrbigny, 1840. 

 Verneuilina rectimargo Cushman, n. sp. 



Plato XXIX, figures 4, 5. 



Test elongate, triangular in cross section, 

 early portion tapering, adult portion with the 

 sides nearly parallel and straight; chambers 

 numerous, arranged triserially; sutures not 

 depressed, often slightly limbate; sides of the 

 test flattened or very slightly concave; periph- 

 eral angles rounded; aperture slightly elon- 

 gate at the base of the inner margin of the last- 

 formed chamber; wall finely punctate. Length 

 1 millimeter or less. 



Type specimen from station 6452, Mint 

 Spring Bayou, Vicksburg, Miss. Specimens 

 were also found in the Mint Spring marl at the 

 following stations: 



6447, 6448. Glass Bayou, Vicksburg, Miss. 

 64.51. Mint Spring Bayou, Vicksbiwg, Miss. 



This is a much longer species than V. spinu- 

 losa glabrata, which occurs in the Byram marl, 

 and can be easily distinguished from it. 



Genus GAUDRYINA DOrbigny, 1839. 



Gaudryina triangularis Cushman. 



Gaudryhvi triangularis Cushman, U. S. Nat. Mus. Bull. 71, 

 pt. 2, p. G.5, figs. 104 a-c (in text), 1911; U. S. Nat. 

 Mus. Bull. 103, p. H6, pi. 20, fig. 3, 1918; Carnegie 

 Inst. Washington Pub. 291, p. 8.5, 1919. 



Test slightly longer than broad, for the most 

 part triangular, the angles rather acute, com- 

 posed of a series of chambers triserially ar- 

 ranged, the later chambers rotund, biserially 

 arranged, few in number; walls coarsely arena- 

 ceous, more or less smoothly finished; sutures 

 plainly visible on the exterior; aperture narrow, 

 between the inner border of the chamber and 

 the preceding chamber; color gray. Length 

 about 1 millimeter. 



A single specimen from station 7671 

 ("Brown's Cave," Leaf River, Miss.) may be- 

 long to this species. It was originally de- 

 scribed from specimens obtained off the 

 Hawaiian Islands and is recorded as occurring 

 near the Bonin Islands. I have also identified 

 it in the Miocene marl from the gorge of Yumuri 

 River, Matanzas, Cuba, and in the Oligocone 

 from the lower part of the Culebra formation 

 in the Canal Zone. 



Gaudryina sp.? 



Plate XXIX, figure 6. 



There is a specimen from U. S. G. S. station 

 6451 (waterfall in Mint Spring Bayou, Vicks- 

 burg, Miss.; E. N. Lowe and C. W. Cooke, 

 collectors) which is apparently a Gaudryina, 

 but it is not well enough characterized for 

 description. 



Genus BULIMINA DOrbigny, 1826. 

 Bulimina pupoides D'Orbigny. 



Plate XXIX, figure 7. 



Bulimina pnpouks D'Orbigny, Foraminifferes fossiles du 



bassin tertiaire de Vienne, p. 185, pi. 11, figs. VA, 



14, 1846. 

 H. B. Brady, Challenger Rept., Zoology, vol. 9, p. 400, 



pi. .50, figs. 1.5a, 6, 1884. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 2, p. 80, figs. 



132 a-c (in text), 1911. 



Test ovate, broadest near the apertural end; 

 apical end bluntly pointed, tapering; end view 

 nearly circular; visilale chambers numerous, 

 much inflated; sutures rather deeply de- 

 pressed; wall smooth; aperture long and nar- 

 row, with a narrow platelike tooth; color white. 

 Length about 1 millimeter. 



There are single specimens wliich may be 

 referred to this species from the following sta- 

 tions : 



6647. Chickasawhay River IJ miles southwest of Boice, 

 Miss. 

 7671. "Brown's Cave," Leaf River, Miss. 



They are much longer than B. ovata, which 

 occurs in the B\Tam marl. 



Genus BULIMINELLA Cushman, 1911. 



Buliminella subteres H. B. Brady var. angusta Cushman, 

 n. var. 



Plate XXIX, figures 8, 9. 



Variety differing from the typical species in 

 the more elongate, narrower shape of the test 

 and the larger number of chambers; aperture 

 elongate, nearly in the long axis of the test; 



