98 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1921. 



from tho south Pacific, and it may be predicted 

 that a study of the ratlier shaUow-watcr mate- 

 rial from that region will show that the species 

 there is closely related to if not identical with 

 this one from the Byram marl. 



Reuss's original material was from the Cre- 

 taceous of Europe. A critical study of the 

 various figures assigned to .1. aminonoidcf) will 

 show that several forms have been included 

 under the one name. 



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



Plato XXI, figures 3-5. 



A form in the Byram marl may questionably 

 be referred to this species. It is very close to 

 the form figured by Brady in the Chalh'ngrr 

 report (pi. 94, fig. 4), which is very different 

 from the original of Giimbel, as a comparison 

 of the two will show. 



Millett records this species with .1. ammo- 

 noidt.9 as widely distributed in the Malay 

 Archipelago, and as botli are recorded from a 

 nimiber of stations off the Hawaiian Islands a 

 review of tropical Pacific material should be 

 made to see just what forms are really present 

 there. 



Anomalina mississippiensis Cushman, n. sp. 



Plate XXI, figures (i-8. 



Test small, planoconvex, of about two and 

 one-half coils, periphery slightly lobulate, 

 bluntly rounded, dorsal side very much flat- 

 tened, even slightly concave, ventral side very 

 convex; chambers comparatively few, six to 

 eight in the last-formed coil, sutures curvctl, 

 on the dorsal side broad and limbate, even 

 with the surface of clear shell material, on the 

 ventral side narrower and depressed; the last- 

 formed two or three chaml)ers on the inner 

 margin on the dorsal side slightly above the 

 general surface; wall thin and translucent, 

 especially on the dorsal side, smooth; on the 

 ventral side finely punctate and not so clear; 

 aperture a curved opening at the inner margin 

 at the periphery. Lengtlt 0.2.5 to 0.3.3 milli- 

 meter, breadth 0.20 to 0.30 millimeter. 



This species is fairly common in tlie marl 

 at Byrana but might easily be overlooked on 

 account of its small size. It is very constant 

 in its chambers and in size and seems to be 

 a well-distinguished little species. In some 

 respects it has affinities with Truncatulina 



americana Cushman, and in others with Anoma- 

 lina {/rossfrugosa (Giimbel) ? var., already men- 

 tioned, but it is very distinct from either. 



Genus SIPHONINA Reuss, 1849. 

 Siphonina advena Cushman, n. sp. 



Plate XXII, figures 1, 2. 



Test unequally biconvex, dorsal side usually 

 less convex than the ventral, periphery sub- 

 acute, chambers in tln-ee or more coils, four 

 chambers making up the last-formed coil, 

 sutures distinct, on the dorsal side flush with 

 the surface, on the ventral side slightly de- 

 pressed, on the dorsal side somewhat broad- 

 ened and limbate, ventrally narrow, surface 

 smooth but punctate; aperture with a short 

 neck, compressed, with a phialine lip and 

 elliptical aperture; color even in the fossil 

 specimens somewhat brownish, wall thin and 

 translucent. Diameter 0.50 millimeter or less. 



This species is common in the marl at Byram 

 but never shows any of the characters of S. 

 reticulata (Czjzek), to which it is related. It 

 is nearer to S. pulcJuUa Cushman, from the 

 Miocene of Yumuri River gorge, near Matanzas, 

 Cuba, but differs in the size and shape of the 

 chambers and the character of tlie stitures. 



Genus GYPSINA Carter. 1877. 

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



Plate XXII, figure:^. 



Phinorhulinii rubra D'Orbigny, Annalessri. nat., vnl. 7, p. 



280, No. 4, lS2f!. 

 Fornasini, Acad. sci. 1st. Bologna Mem., (ith ser., 



vol. .-,, J). 4-1, pi. 2, fig. 3, 1908. 

 dypsina rubra (D'Orbigny) Heron-Allen and E.<irland, 



Zool. Sor. London Trans., vol. 20, p. 72.5, ])'. .53. figs. 



:3.5-37, 1915. 



A number of specimens of this species were 

 collected in the marl at Byram. 



Although in the fossil specimens tlie color 

 is of course lacking, the characteristic second- 

 ary growth seems to be developed. 



This is an Indo-Pacific species recorded by 

 D'Orbigny from the South Seas and Sarawak. 

 Heron-Alien and Earland note its occurrence 

 in the Kerimba Archipelago, off the south- 

 eastern coast of Africa. They also record it 

 in sliore sands from Fremantle, West Australia, 

 from Lord Howe Island, and from Apia Beach 

 and the Lufi-lufi reef, Samoa, and note that 

 "it is probably widely distributed in sliallow 

 water across the Indo-Pacific region." 



