FOKAMINIFERA OF THE BYEAM CALCAKEOUS MAEL AT BYRAM, MISS. 



103 



report (pi. 5, fig. 5) and placed as MUiolina 

 venusta Karrer. The specimens from the 

 Byram marl are even longer and more slender 

 and may not be this species at all. They are 

 figured and noted here so that the form may 

 be made available for later comparisons. 



Quinqueloculina sp.? 



Plate XXVI, figure 6. 



A few specimens from the Byram marl are 

 large (1.50 to 1.75 millimeters long) and have 

 much the form of Triloculina ohlonga (Montagu) 

 but are ciuinqueloculine. The surface is in 

 most of them worn and smooth, but in one of 

 the largest, best-preserved specimens there is a 

 faint longitudinal striation. In this connec- 

 tion the note which Heron-Allen and Earland 

 give under MUiolina ohlonga in their Kerimba 

 work (p. 567) is interesting. "At stations 9 

 and 12 the specimens were large and showed 

 signs of superficial markings linking the species 

 with M. striata." 



Genus HAUERINA D'Orbigny, 1846. 

 Hauerina fragilissima (H. B. Brady) Millett. 



Plate XXVII, figure 3. 



S piroloeuUna fragilissima H. B. Brady, Challenger Rejit., 



Zoology, vol. 9, p. 149, pi. 9, figs. 3 2-14, 1884. 

 Hauerina fragilissima (H. B. Brady) Millett, Roy. Micr. 

 Soc. Jour., p. 610, 1)1. 13, figs. 8-10, 1898. 

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



vol. 20, p. 587, pi. 46, figs. 1, 2, 1915. 

 Cushman, U. S. Nat. Mus. Bull. 71, pt. 6, p. 64, pi. 

 24, fig. 4, 1917. 



A number of very typical specimens of this 

 species have been identified from the marl at 

 Byram. 



All the known records for this species are 

 Indo-Pacific. Brady's original localities are 

 off Tahiti, Society Islands, 420 and 620 fath- 

 oms; off Kandavu, Fiji Islands, 255 fathoms; 

 south coast of NeV Guinea, 3 to 28 fathoms; 

 north coast of New Guinea, 16 to 25 fathoms. 

 Millett records it from the Malaj^ Archipelago. 

 Heron-Allen and Earland found it in material 

 from the Kerimba Archipelago, oft' the south- 

 eastern coast of Africa. I have found the spe- 

 cies in material collected off the Hawaiian 

 Islands in 271 fathoms. 



Tliis record from the lower Oligocene Byram 

 marl confirms the Indo-Pacific relations of the 

 Byram fauna. 



The test of this species is very thin and of a 

 pecuhar opalescent character, the surface 



smooth or slightly pitted, the sutures usually 

 appearing as whitish lines in the test. 



Hauerina sp.? 



Plate XXVII, figure 4. 



A single somewhat broken specimen in the 

 marl from Byram belongs to the genus Hauer- 

 ina. It differs from H. fra(/ilissi7na in the 

 sharp edge to the peripheral borders of the 

 chambers, even carinate, and the character of 

 the wall, which though thin and transparent 

 seems to have deep pits or possibly perfora- 

 tions at wide btit regular intervals, in a single 

 irregular line do\vn the curved part of the 

 chamber. 



Genus ARTICULINA D'Orbigny, 1826. 

 Articulina byramensis Cushman, n. sp. 



Plate XXVII, figures 5, 6. 



Test of two portions, a basal triloctiline por- 

 tion followed by a single linear chamber, the 

 earlier portion with the lip of the antepenulti- 

 mate chamber standing out free at the base, 

 that of the penultimate chamber covered by 

 the base of the last-formed one, last chamber 

 rotmded in transverse section or slightly com- 

 pressed, with a broadly flaring, slightly down- 

 ward-curved lip; aperture rounded, slightly 

 longer than wide; surface of the test with nu- 

 merous longitudinal costae, sharp, sometimes, 

 especially in the final chamber, anastomosing. 

 Length 1.25 millimeters. 



This is a fairly common species in the marl 

 at Byram and is very constant in its characters. 

 The free lip of the chamber projecting at the 

 base is peculiar and constant in all specimens, 

 and the single linear chamber with very wide 

 lip and the sharply cut, often anastomosing 

 costae are also noints that distinguish the 

 species. 



A. hyram.ensis is allied to certain of the spe- 

 cies usually classed under A. conico-articulata. 

 It is close to the specimen from waters off the 

 Hawaiian Islands I have referred to A. conico- 

 articulata " and is even more strikingly like 

 the specimens from the Kerimba Archipelago 

 figured by Hercn-Allen and Earland " as 

 Articulina ftagra D'Orbigny. This suggests 

 that we have here a definite species, fossil in 

 the Byram marl and living in the Indo-Pacific. 



" U. S. Nat. Mus. Bull. 71, pt. 6, pi. 22, figs. 5, 6, 1917. 

 » Zool. Soc. London Trans., pi. 45, figs. 22-25, 1915. 



