104 



SHORTER CONTRIBT^TIONS TO GENERAL GEOLOGY, 1921. 



Genus MASSILINA Schlumberger, 1893. 

 Massilina crusta Cushman, n. sp. 



PUitH XXVIII, figure 1. 



Test elliptical, compressed, periphery cari- 

 nate, early chambers i|uiiK|uekiculine, later 

 ones 1S0° from one another, making a Hat test, 

 sutures distinct, central portion of each cham- 

 ber elliptical in transverse section, surface 

 with a slight secondary thickening, the test 

 itself ornamented by a series of very short 

 longitudinal pits, apcrtural and basal ends of 

 each chamber strongly projecting, the basal 

 end rounded, the aperture rounded with a 

 biiid tooth; sin-face dull. Length l.(i() milli- 

 meters or less, 



A few specimens in various stages occurred 

 in the marl at Byram. This species in some 

 ways resembles the figures of Spiroloculina 

 ■plaiii,<:i^imii (Lamarck) from the Kerimba Archi- 

 pelago given by Heron-Allen and Earland.'"' 

 Our specimens are, however, much more in- 

 volute and belong to Massilina. The shape of 

 the apertural end and the carinate periphery- 

 are verv" similar in the two forms. 



Massilina occlusa Cushman, n. sp. 



rU't.' XXVIII. fi,!;ur('2. 



Test elongate, narrowly elliptical in face view, 

 involute, the peripheral margins scjuarely ti-un- 

 cate, initial end of the chamber projecting 

 backward beyond the former apertm-e, rounded, 

 apertural end somewhat produced, whole 

 chamber nearly sciuare in transverse section; 

 sutures distinct; aperture rounded, neck 

 square; surface dull, smooth. Length 0.75 

 millimeter oi- less. 



This species is represented in the marl at 

 Byram by several specimens, all of this same 

 shape and character. 



The involute <'haracter of the last-formed 

 chambers hides the early chambers almost 

 completely. The whole test has a squarish 

 form that is continued even to the apertural 

 neck. The shape of the initial end of the last- 

 formed chamber is also very constant and 

 characteristic. 



Massilina occlusa Cushman, n. sp., var. costulata Cush- 

 man, n. var. 



Test differing from the typical form in the 

 surface, which instead of being smooth and 



" Zool. Soc. London Trans., vol. 20, pi. 41, figs. 1-6, 1915. 



j polished as in the type has an ornamentation 

 of several longitudinal, more or less irregular 

 costae, running out on the neck of the last- 

 formetl chamber, the angles of the chambers 

 sharp and carinate, the periphery of the test 

 concave. 



This, form is rare in the marl at Byram and 

 seems to be cither a distinct species or a rariety 

 of J/, occlusa. It may be compared to such 

 forms as SpirolocuUna, coslif/era Terquem, S. 

 cofitata Terquem, S. striata Terquem, and S. 

 scnri-ovata Terquem, from the Eocene of the 

 Paris Basin, though it is unlike any of these. 



Genus TEILOCTTLINA DOrbigny. 1826. 



Triloculina rotunda D'Orbigny. 



Triloculinn rotunda D'Orbigny, Aunales sci, nal., vol. 7, 

 p. 299, No. 4, 1826. 

 Schlumberger, Soc. zool. France Mem., vol. 6, p. 20(5, 

 pi. 1, figs. 48-.50, fig.-!. 11, 12 (in text), 189::i. 



Several specimens from the marl at Byram 

 are here referred to this species. They are tri- 

 loculine, smootli, nearly as broad as long, and 

 the chambers rounded. Tlie longest are about 

 0.75 millimeter in length. 



T. rntunda is recorded from widely separated 

 localities. l>ut thei'e are various forms, as noted 

 in the literature on the species. 



Triloculina oblonga (Montagu) D'Orbigny. 



Plate XXVIII, figures ?,. 4. 



Vfriiikidam oblongum Montagu, Testai'ea Britannica, p. 



522, pi. 14, fig. 9, 1803. 

 Trilonilina oblonga (Montagu) D'Orbigny, .\nnales sci. 



nat., vol. 7, p. :iOO, No. 16, MoaWes, No. 9."i, 1826; 



in De la Sagra, Ilistoire physique, politique et nat- 



urelle de I'ile de Culia, Foramini feres, p. lr>b, jjl. 10, 



fig.s. 3-.5, 1839. 

 <'ushman, U. S. Nat. Mus. Bull. 71, pt. 6. (i. (i!». jil. 26, 



lig. 3, 1917. 

 Miliollna oblonga (Montagu) H. B. Brady, ( 'lialkngcr 



Kept., Zoology, vol. 9, p. 160, pi. b, fi.gs. 4a, h, 1884. 

 Millett, Roy. Micr. Soc. Jour., p. 267. p\. 5, fig. 14, 



1898. 

 Heron-.\llen and Earland, Zoul. Soc. London Tran.s., 



vol. 20, p. .Vi6, 191.'i. 



,\ few small but otherwise typical speci- 

 mens of this species were found in the marl at 

 Byram. They are widest near the base and 

 thence taper to the narrower apertural end; 

 the surface is smooth and polished. Length 

 about 0.35 millimeter. 



The specimen figured by Brady seems to be 

 a QiiinqurJociiJiiia and to lack the character- 

 istic shape of the tropical specimens in shallow 



