FOEAMINIFERA OF THE BYRAM CALCAREOUS MARL AT BYRAM, MISS. 



89 



Rotaliidfe — Continued. 



Truncatulina lobatula (Walker and Jac'oli) D'Orlugny. 



Trunca.tulina InTamonsis Cnshman, n. sji. 



Truncatulina amerirana Cushman. 



Truncatulina jiscudoungeriana Cushman, n. sp. 



Anomalina liilatoralis ("ushman, n. sp. 



Anomalina grosserugosa (Giimliel) H. B. Brady? var. 



Anomalina mississijipiensis Cushman, n. sp. 



Siphonina advena Cushman, n. sp. 



Gypsina rubra (D'Orbigny) Heron-Allen and Earland. 



Puhinulina l)yramensis Cushman, n. sp. 



Puhinulina advena Cushman, n. sp. 



Pulvinulina glalirata Cushman, n. s]). 



Rotalia bjTamensis Cushman, n. sp. 



Rotalia dentata Parker and Jones. 



Asterigerina suhacuta Cushman, n. sp. 

 Nummulitidae: 



Nonioninaumbiliiatula (Montagu) Parker, Jones, and 

 H. B. Brady. 



Nonionina scapha l Fichtel and Moll ) Parker and Jones. 



Nummulites sp. 



Lepidocyclina supera (Conrad) IL I>ou\'iIle. 

 Miliolidae : 



Cornuspira involvens (Reuss) Reuss. 



Spiroloculina gratelou]ii D'Oibigny. 



Spiroloculina liyramensis Cushman, n. sp. 



Spiroloculina imprimata Cushman, n. sp. 



Vertebralina advena Cushman, n. sp. 



Vertebralinasp.? 



Quinqueloculina crassa D'Orbigny? 



Quinqueloculina bicostata r)'()rbigny, var. 



Quinqueloculina cuvieriana P'Orhigny. 



Quincjueloculina venusta Karrer?, var. 



Quinqueloculina sp.? 



Hauerina fragilissima (11. B. Brady) Millett. 



Hauerina sp.? 



Articulina byramensis Cushman, ii. sp. 



Massilina crusta Cushman, n. sp. 



Massilina occlusa Cushman, n. sp. 



Massilina occlusa Cushman, n. sji., ^ar. costulata 

 Cushman, n. var. 



Triloculina rotunda D'Orbigny. 



Trilorulina oblonga (Montagu) D'Orliigny. 



Trilnculina trigonula (Lamarck) D'Orbigny. 



Biloculina sp.? 



DESCRIPTIONS. 



Family TEXTULARHDAE. 



Genus TEXTULARIA Defrance. 1824. 



Textularia agglutinans D'Orbigny. 



Plate XIV, figures la, lb. 



Textularia agglutinans D'Orbigny. in De la Sagra, Histoire 

 physique, politique ot naturelle de Pile de Cuba, 

 Foraminiferes, p. 136, pi. 1, figs. 17, 18, 32-.M, 1839. 



H. B. Brady. Challnu/tr Rept., Zoology, vol. 9, p. 363, 

 pi. 43, figs. 1, 2, 1884. 



Cushman, U. S. Nat. Mus. Bull. 71. pt. 2, p. 9, figs. 

 10a, b (in text). 1911. 



Test elongate, large and stout, gradually 

 tapering from the initial end, chambers nearly 

 as high as wide, tumid; sutures depressed, dis- 



tinct, early portion somewhat compressed; 

 wall coarsely arenaceous, but in section with a 

 calcareous base; ap<>rture in a well-marked 

 depression at the base of the inner margin of 

 the last-formed chamber; early chambers usu- 

 ally rougher than the later ones. Length 2 

 millimeters or less. 



Textularia a(i(jlutinans is rather common in 

 the Byram marl. The specimens are closely 

 similar to the types from Cuba described by 

 I.)'Orl)igny. 



This name has been used for a great variety 

 of forms, but it should be limited to the one 

 described by D'Orbigny, wliich has a generally 

 tapering form and very rounded chambers, 

 with the surface arenaceous but rather 

 smoothly finished. 



Textularia tumidulum Cushman, n. sp. 



Plate XV, figures 1, 2a, 2b. 



Test large, elongate, compressed, thickest in 

 the central region, thence thinning toward the 

 periphery, initial end rapidly broadening in 

 the adtilt, the sides nearly parallel to a point 

 near the apertural end, where the breadth of 

 the test is reduced; chambers numerous, in 

 the adult about tliree times as wide as high, 

 and the last-formed chamber in many old-age 

 specimens somewhat distinctly set off from the 

 others, the inner portion of each chamber much 

 thicker than the other portions and in the rapid 

 decrease in thickness often leaving a channel 

 running lengthwise of the test between this 

 central tumid area and the gradually sloping 

 outer portion, usually very well marked in 

 adult specimens; sutures not very distinct; 

 wall arenaceous but smoothly finished. 

 Largest specimens 2.5 millimeters in length. 



This is one of the most common and most 

 conspicuous of the species of the Byram marl 

 at Byram. It is very well characterized by its 

 central tumid area with longitudinal channels 

 at each side, and the general slope to the 

 rounded periphery. The figures show a typ- 

 ical adult (except that the sutures are more 

 distinct than is typical) and a specimen in its 

 earlier stage before the tumid central portions 

 are so strongly developed. 



Textularia subhauerii Cushman, n. sp. 



Plate XIV, figures 2a, 2b. 



Test large, stout, elongate, early portion 

 rapidly increasing in width with each newly 

 added chamber, later adult portion with the 



