FORAMINIFEEA OF THE BYRAM CALCAREOUS MARL AT BYRAM, MISS. 



93 



Genus EHRENBERGINA Reuss, 1850. 

 Ehrenbergina glabrata Cushman, n. sp. 



Plate XVII, figures 4a-4c. 



Test small, in front view broadly triangular, 

 chambers numerous, distinct, low and broad, 

 sutures distinct, on the ventral side at the bot- 

 toms of deep rounded depressions, on the dorsal 

 side but slightly depressed below the general 

 surface, periphery lobulate; surface smooth, 

 aperture elliptical at the base of the inner 

 margin of the last-formed chamber. Length 

 0.4 millimeter. 



This species is rare in the Byi-am marl at the 

 type station. It difl'ers from the widely dis- 

 tributed deep-water species E. serrata Reuss 

 in the rounded chambers, smooth surface, and 

 lack of spines or sharp angles. 



A form that occui's in comparatively shal- 

 low water in the Australian region is Yerj 

 similar to the species figured here and may be 

 the same. The identity would not be surpris- 

 ing, in view of the relationships of other species 

 already noted. 



Family LAGENIDAE. 



Genus NODOSARIA Lamarck, 1812. 



Nodosaria sp. 



Plate XVI, figtire 0. 



A single specimen of Nodosaria in the 

 material from the Byram mail is incomplete, 

 showing only the last four chambers. It has 

 a tapering form, well-defined chambers, and 

 the surface ornamented by ten to twelve 

 longitudinal costae. This specimen is here 

 figured but not identified specifically, as the 

 material is not well enough preserved. 



Nodosaria sp.7 



Plate XVI, figure 6. 



The figured specimen shows the characters 

 of a single, fragmentary specimen with both 

 ends missing. It is smaller than the specimen 

 described above but has nearly twice as many 

 costae, and the chambers are not well marked. 

 It can not be identified specifically until more 

 material is available. 



Genus CRISTELLARIA Lamarck. 1812. 



Cristellaria sp. 



A single specimen of the genus Cristellaria 

 is included in the Byram marl material exam- 



323.33°— 22 7 



ined from the type locality. It has very few 

 chambers, seven or eight in the visible coil; 

 the surface is generally smooth, except on the 

 sutures, which are marked by rather broad, 

 curved, raised ridges, those near the earlier 

 part of the coil broken into rounded loiobs, the 

 later ones more continuous; periphery angled 

 but not carinate, the apertiiral face smooth 

 and somewhat concave; aperture at the angle 

 of the chamber. Length about 0.6.5 milli- 

 meter. 



As this is a imique form its specific assign- 

 ment should await the finding of more mate- 

 rial. 



Genus VAGINXTLINA D'Orbigny, 1826. 



Vaginulina legumen (Linnaeus) D'Orbigny var. elegans 

 (D'Orbigny) Fornasini. 



Plate XVII, figure 1. 



A single specimen from the marl at Byram 

 shows the earlier chambers with a fairly well 

 developed spine, the chambers as long as wide, 

 surface smooth, sutures somewhat oblique, 

 and showing a ventral side where the sijture 

 runs backward somewhat. This is not unlike 

 certain forms now found living in the Philip- 

 pine region. 



Genus POLYMORPHINA D'Orbigny. 1826. 

 Polymorphina gibba D'Orbigny. 



Plate XVII, figure 3. 



Polymorphina subcorditormia vel oviformia Soldani, 



Testaceographiae, vol. 1, pt. 2, p. 114, pi. 113, 



figs, zz, C, etc., 1791. 

 Polymnrpliina {Globulina) gibba D'Orbigny, Annales sci. 



nat., vol. 7, p. 226, No. 20, Mod&les, No. 63, 1S26. 

 Egger, Neues Jahrb., 1S.57, p. 288, pi. 13, figs. 1-4. 

 Polymorphina gibba IT. B. Brady, Parker, and Jones (part), 



Linncan Soc. London Trans., vol. 27, p. 216, pi. 39, 



figs. 2a-d, 1870. 

 H. B. Brady, Challenger 'Rept-, Zoology, vol. 9, p. 561, 



pi. 71, figs. 12a, b, 1884. 

 Sidebottom, Manchester Lit. and Philos. Soc. Mem. 



and Proc, vol. 51, No. 9, p. 10, pi. 2, figs. 1.5-17, 



1907. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 3, p. 85, pi. 41, 



fig. 4, 1913; U. S. Geol. Survey Bull. 676, p. 11, 



pi. 2, fig. 4, p. 52, pi. 11, fig. 5, 1918. 



Test rotund, in front view nearly circular, 

 in end view broadly oval; chambers few, dis- 

 tinct, sutures distinct, but little if at all exca- 

 vated; wall smooth and translucent; aperture 

 slightly produced, radiate. Length 0.75 milli- 

 meter or less. 



