FORAMINIFERA OF THE MINT SPRING CALCAREOUS MARL. 



129 



Lagena orbignyana (Seguenza) H. B. Brady var. flintii 

 Cushman, n. var. 



Plate XXIX, figure 11. 



Lagena castrensis Flint (not Sch wager), U. S. Nat. Mua. 

 Ann. Kept, for 1897, p. 308, pi. 54, fig. 5, 1899. 



Variety with a secondary keel at each side 

 near the periphery and a series of two or thi-ee 

 concentric lines of lacunae or pitted areas of 

 uniform size inside the inner carina, the cen- 

 tral part of the test being nearly smooth. 

 Length 0.45 millimeter. 



Type specimen from station 6447, Glass 

 Bayou, Vicksburg,^Jiss. This is very similar to 

 specimens from off the eastern coast of the 

 United States figured by Flint, as cited above. 

 The ornamentation is much more distinct on 

 the peripheral portion than in the center, which 

 is nearly smooth. 



Lagena hexagona (Williamson) Siddall. 



Plate XXIX, figure 12. 



ErUosolenia squamosa Montagu var. hexagona WilUamson, 

 Annals and Mag. Nat. Ilist., 2d ser., vol. 1, p. 20, 

 pi. 2, fig. 23, 1848; Recent Forarainifera of Great 

 Britain, p. 13, pi. 1, fig. 31, 1858. 



Lagena hexago7ia (Williamson) Siddall, Catalogue of 

 British Recent Foraminifera, p. 6, 1879. 

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



472, pi. 58, figs. 32, 33, 1884. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 3, p. 17, pi. 

 6, figs. 2, 3, 1913. 



Test subglobular, broadly rounded at the 

 apical end, bluntly pointed at the apertural 

 end, surface ornamentation consisting of a 

 reticulate pattern, the areoles of which are 

 hexagonal, either arranged in vertical rows or 

 irregular. Length 0.5 millimeter. 



The only record for this species in this lot 

 of materiai is from station 6452, Mint Spring 

 Bayou, VicRsburg, Miss. It is similar to the 

 specimen I have figmed.^ 



Genus NODOSABIA Lamaick, 1812. 



Nodosaria communis D'Orbigny. 



Plate XXX, figure 4. 



Nodosaria (Dentalina) communis D'Orbigny, Annales sci. 



nat., vol. 7, p. 254, No. 35, 1826. 

 Nodosaria communis H. B. Brady, Challenger Rept., 



Zoology, vol. 9, p. 504, pi. G2, figs. 19-22, 1884. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 3, p. 54, pi. 28, 



figs. 1, 2, 1913. 



Test elongate, slender, tapering, straight or 

 more often slightly curved, composed of 



8 Cushman, J. A., op. cit., pi. f>. fig. 2. 



numerous chambers, slightly inflated toward 

 the apical end but later ones becoming more 

 inflated; sutures oblique; aperture radiate, 

 slightly eccentric, somewhat elongate; surface 

 smooth. Length 3 millimeters or more. 



Single specimens of this species were found 

 at two stations; 



6451. Mint Spring Bayou, Vicksburg, Miss. 

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



Nodosaria filiformis D'Orbigny. 



Plate XXX, figures 1-3. 



Nodosaria fiUformis D'Orbigny, Annales sci. nat., vol. 7, 



p. 253, No. 14, 1826. 

 II. B. Brady, Challeivjer Rept., Zoology, vol. 9, p. 



.500, pi. 63, figs. 3-5, 1884. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 3, p. 55, pi. 



27, figs. 1-4, 1913. 



Test elongate, slender, arcuate; chambers 

 numerous, elliptical or ovate, elongate, tumid, 

 sutures usually oblique; chambers increasing 

 in length toward the apertural end; aperture 

 radiate, slightly eccentric; wall smooth. 

 Length 5 millimeters or less. 



Specimens showing a few chambers which 

 seem to belong to this species were collected at 

 three stations: 



6448. Gla.ss Bayo>i, Vicksburg, Miss. 



6451. Mint Spring Bayou, Vicksburg, Miss. 



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



They are elongate, cylindrical, and slightly 

 contracted at the ends, and the apertural end, 

 where shown, is long and tapering. 



Nodosaria obliqua (Linnaeus) H. B. Brady. 

 Plate XXX, figures 6, 7. 



Nautilus obliquus Linnaeus, Systema naturae, 10th ed., 



p. 711, 1758; 13th ed. (Gmelin's), p. 3372, No. 14, 



1788. 

 Nodosaria obliqua (Linnaeus), H. B. Brady, Challenger 



Rept., Zoology, vol. 9, p. 513, pi. 64, figs. 20-22, 1884. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 3, p. 59, pi. 



25, fig. 5, 1913. 

 Nodosaria (Dentalina) obliqua (Linnaeus) Parker and 



Jones, Annals and Mag. Nat. Hist., 3d ser., vol. 3, 



p. 482, 1859, 



Test elongate, tapering, apical end often 

 with a spine; chambers mmierous, in the early 

 portion not distinct, in the later portion tumid; 

 sutures depressed; surface ornamented with 

 numerous rounded costae, fairly broad, as 

 many as forty in the adult chambers of some 

 of the specimens, costae continuous on the 

 apical spine to the apertural end, additional 

 ones added between those already formed; 



