FOKAMINIFEKA OF THE MINT SPRING CALCAREOUS MARL. 



131 



Miss. This species wa,s also found at station 

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



This is undoubtedly the same as the species 

 found m the Byram marl and recorded without 

 a specific name.^ It seems to be very constant 

 m its characters and can be distinguishid by 

 the peculiar ornamentation, the uncoiling of 

 the later portion of the test, and the concave 

 apertural face. 



Genus VAGINULINA DOrbigny. 1826. 



Vaginulina legumen (Linnaeus) D'Orbigny var. ihgans 

 (D'Orbigny) Fornasini. 



Vaginulina legumen (Linnaeus) D'Orbiguy var. elegans 

 (D'Orljigny) Fornasini, Soc. geol. italiana Boll., 

 vol. 5, p. 25, pi. 1, figs. 1?, 2-8, 1886. 

 Cushman, U. S. Geol. Survey Prof. Paper 129, p. 93, 

 pi. 17, fig. 1, 1922. 



There is a smgie broken specimen of this 

 variety from station 6447 (Glass Bayou, 

 Vicksburg, Miss.), similar in form to that 

 which I have seen from the Philippines. This 

 has also been recorded from the B3Tam marl. 



Genus POLYMORPHINA D'Orbigny, 1826. 



Polymorphina byramensis Cushman. 



Polymorphinii hi/mmensis Cushman, U. S. Cieol. Survey 

 Prof. Paper 129, p. 94, pi. 17, figs. 2a, 2b, 1922. 



Test short and broad, triangular, composed 

 of a few chambers, usually only four, all except 

 a final fifth chamber extending back to the base 

 of the proloculum, forming a truncate test; 

 chambers inflated: sutures deep and distinct; 

 surface smooth: aperture radiate, only slightly 

 produced. Length 0.75 millimeter or less. 



This species, which is common in the Byram 

 marl, has been fcjund at all the stations in the 

 Mmt Spring marl studied in this collection, as 

 follows : 



6447, 6448. Glass Bayou, Vicksburg, Mss. 

 6451, 6452. Mint Spring Bayou, Vicksl)urg, Miss. 

 6647. Chickasawhay River IJ miles southwest of Boice, 

 Miss. 

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



The specimens are very typical. A large 

 proportion of them have three or fom' chambers 

 with a triangular test, trimcate at the base, 

 the fifth chamber when present being added 

 at a higher level. 



5 Cushman, J. A., U. S. Geol. Survey Prof. Paper 129, p. 93, 1922 (Prof. 

 Paper 129-E). 



Polymorphina regina H. B. Brady, Parker, and Jones. 



Plate XXX, figure 8. 



Polymorphina regiria H. B. Brady, Parker, and Jones, 



Linnean Soc. London Trans., vol. 27, p. 241, pi. 41, 



figs. 32n, b, 1870. 

 H. B. Brady, Challenger Rept., Zoology, voL 9, p. 571, 



pi. 7:5, figs. 11-13, 1884. 

 Egger, K. liayer. Akad. Wi.^^s. Miinchen Abh., CI. 2, 



vol. 18, p. 310, pi. 9, figs. 45, 50, 51, 1893. 

 Millett, Roy. Micr. Soc. Jour., 1903, p. 265. 

 Bagg, Maryland Geol. Survey, Miocene, p. 478, pi. 



133, fig. 7, 1904; U. S. Nat. Mus. Proc, vol. 34, p. 



149, 1908. 

 Chapman, Quekett Micr. Clu!) Jour., 2d ser., vol. 10, 

 . p. 132, pi. 10, fig. 4, 1907 [1909]; Roy. Soc. Victoria 

 ' Proc, vol. '22, p. 281, 1910. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 3, p. 91, pi. 



41, figs. 6, 7, 1913. 

 Heron-Allen and Earland, Zool. Soc. London Tians., 



vol. 20, p. 673, 1915. 

 Cushman, U. S. Geol. Survey Bull. 676, p. 54, pi. 



11, figs. 3, 4, 1918; U. S. Nat. Mus. Proc, vol. 56, p. 



619, 1919; U. S. Geol. Survey Prof. Paper 129, pi. 



18, fig. 4, 1922. 



Test elongate, fusiform; chambers tumid, 

 distinct, especially in the later portion; sutures 

 deep; wall ornamented by numerous longitu- 

 dinal costae, usually continumg unbroken 

 across several chambers; aperture radiate, 

 somewhat produced. Length 1 millimeter or 

 less. 



This species was found at three of the Mint 

 Spring marl stations, as follows: 



6448. Glass Bayou, Vicksburg, Miss. 



6452. Mint Spring Bayou, Vicksbm-g, Miss. 



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



It also occurs in the Byram marl and has 

 been recorded from the Miocene of the Coastal 

 Plain of the United States, in the Calvert forma- 

 tion of Chesapeake Beach, Md. (Bagg) , and the 

 Duplin marl of Mayesville, S. C. (Cushman). 

 It is a fairly common species m recent seas in 

 the Indo-Pacific region. 



Polymorphina probiema D'Orbigny. 



Polymorphina (GuUulinu.) probiema D'Grl)igny, Aimales 



sci. nat., vol. 7, p. 266, No. 14, Modules, No. CI, 



1826. 

 Cushman, U. S. Cieol. Survey Prof. Paper 129, p, 94. pi. 



18, fig. 1, 1922. 

 Gutlulina probiema D'Orbigny, Foraminifferes fossiles du 



bassin tertiaire de Vienue, p. 224, pi. 12, figs. 26-28, 



1846. 



Test elongate, fusiform, composed of few 

 chambers, tumid; sutures slightly depressed; 



