FORAMINIFERA OF THE MINT SPRING CALCAREOUS MARL. 



141 



Genus QTTINQUELOCTJLINA D'Orbigny, 1826. 

 Quinqueloculina bicostata D'Orbigny. 



Quinqueloculina bicostata D'Orbigny, in De la Sagra, 

 Histoire physique, politique et naturelle de I'ile de 

 Cuba, Foraminif&res, p. 195, pi. 12, figs. 8-10, 1839. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 6, p. 47, pi. 13, 

 fig. 1, 1917; U. S. Geol. Survey Prof. Paper 129, p. 

 102, pi. 2f), figs. 2-1, 1922. 



Miliolina bicostata Heron-Allen and Earland, Zool. Soc. 

 London Trans., vol. 20, p. 572, pi. 42, figs. 42-45, 

 1915. 



The Mint Spring marl specimens referred to 

 this species are considerably longer than those 

 shown in D'Orbigny's type figures and resemble 

 more those specimens from the Byram marl 

 which I have referred to this species. These 

 pecimens came from the following stations: 



6448. Glass Bayou, Vicksburg, Miss. 



6451. Mint Spring Bayou, Vicksburg, Miss. 



Quinqueloculina cuvieriana D'Orbigny. 



Quinqueloculina cuvieriana D'Orbigny, in De la Sagra, 

 Histoire physique, politique et naturelle de I'ile de 

 Cuba, Foraminif^ros, p. 1C4, pi. 11, figs. 19-21, 1839. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 0, p. 47, pi. 12, 

 fig. 2, 1917; U. S. Geol. Survey Prof. Paper 129, 

 p. 102, pi. 26, fig. 1, 1922. 



Test slightly longer than wide; chambers 

 sharply angled, those of the adult with a second- 

 ary carina at each side of the periphery of the 

 chamber; remainder of the surface smooth; 

 aperture somewhat elongated with a simple 

 tooth. Length 1 millimeter or less. 



This species, which was found in the Byram 

 marl, also occurred sparsely in tlie Mint Spring 

 marl at the following stations: 



6447. Glass Bayou, Vicksburg, Miss. 

 6462. Mint Spring Bayou. Vicksburg, Miss. 



Quinqueloculina cookei Cushman, n. sp. 



Plate XXXIII, figures 2, 3. 



Test much elongate, somewhat fusiform; 

 chambers narrow, widest near the base, 

 rounded, apertural end extended, forming a 

 subcylindrical neck with a simple tooth and 

 slight lip; periphery of the test broad, carinate 

 at each angle, slightly concave between the 

 carinae; sutures distinct; surface smooth, 

 shiny, except the carinae, which are dull. 

 Length 1.5 millimeters or less, diameter 0.35 

 millimeter. 



Type specimen from station 6451, Mint 

 Spring Bayou, Vicksburg, Miss. 



This species in some ways resembles Q. 

 Mcostata, but it is very elongate and slender, 

 and its general form is entirely different. 



Quinqueloculina vicksburgensis Cushman, n. sp. 



Plate XXXIV, figure 6. 



Quinqueloculina venusta Karrer? var., Cushman, U. S. 

 Geol. Survey Prof. Paper 129, p. 102, pi. 26, fig. 5, 

 1922. 



Test much elongate, narrow; chambers dis- 

 tinct; basal end broadly rounded, projecting; 

 apertural end also projecting, forming a cylin- 

 drical neck and rounded aperture; periphery 

 of the test subacute; surface smooth, dull. 

 Length nearly 2 millimeters, width 0.5 milli- 

 meter. 



Type specimens from station 6447, Glass 

 Bayou, Vicksburg, Miss. 



This is probably the same as the form re- 

 corded from the Byram marl as Q. venusta 

 Karrer? var. It is a long, narrow species of 

 peculiar form, as shown in the figure. 



Quinqueloculina glabrata Cushman, n. sp. 



Plate XXXIV, figure 8. 



Test elongate, elliptical in side view, basal 

 end of the chambers somewhat rounded; 

 aperture slightly extending beyond the pre- 

 ceding chamber, aperture ovate with a simple 

 tooth, tending to become bifid toward the tip; 

 periphery of the test with an outside carina, 

 the sides slightly concave; sutures distinct; 

 surface smooth but not shiny. Length L5 

 millimeters, breadth 0.75 millimeter. 



Type specimen from station 6447, Glass 

 Bayou, Vicksburg, Miss. Several specimens 

 of this species were also found at stations 6451 

 and 6452, Mint Spring Bayou, Vicksburg, 

 Miss. 



This species is very constant in its characters 

 at all these stations. 



Quinqueloculina lustra Cushman, n. sp. 



Plate XXXIII, figure 6. 



Test broadly elliptical, somewhat com- 

 pressed; chambers broadly curved, of uniform 

 width, at the basal end slightly projecting, the 

 apertural end only slightly extending beyond 



32333°— 22- 



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