36 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Although the largest specimens of this genus are found in the Indo- 

 Pacific, there is a smaller form which is evidently the same in the 

 West Indian region and the genus also occurs fossil in the late 

 Tertiary. 



SCHLTJMBERGERINA ALVEOLINIFORMIS (H. B. Brady) 



Miliolina alveoliniformis H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, 

 p. 268; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 181, pi. 8, figs. 15- 

 20. — Egger, Abhandl. kon. bay. Akad. Wiss., Mvinchen, CI. II, vol. 18, 

 1893, p. 232, pi. 2, figs. 17-19.— Woodward, The Observer, vol. 4, 1893, 

 p. 76. — MiLLETT, Journ. Roy. Micr. Soc, 1898, p. 510. — Chapman, Journ. 

 Linn. Soc. Zool., vol. 28, 1900, p. 177; vol. 30, 1910, p. 398.— Heron- 

 Allen and Earland, Trans. Zool. Soc. London, vol. 20, 1915, p. 581. 



Quinqueloculina alveoliniformis Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 

 1917, p. 43; Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 443; Proc. U. S. 

 Nat. Mus., vol. 59, 1921, p. 64; Publ. 311, Carnegie Instit. Washington, 

 1922, p. 64; Publ. 342, 1924, p. 58, pi. 21, fig. 8; Publ. 344, 1926, p. 81. 



Test elongate, fusiform, composed of numerous chambers long and 

 narrow, five normally visible from the exterior in the early stages, 

 more in the adult; wall in young specimens thin and porcellanous, 

 in adults covered with sand grains; aperture composed of numerous 

 pores or radiate, typically cribrate. 



Length of Indo-Pacific specimens up to 3 millimeters or more; of 

 the West Indian variety usually not more than 1 millimeter. 



The species is typical of shallow-water, coral-reef conditions. 



The West Indian variety is apparently distinct, of smaller size 

 and the chambers not so narrow, showing but five chambers on the 

 exterior. It may be known as variety occidentalis Cushman, new 

 variety (pi. 7, fig. 2). 



Genus MASSILINA Schlumberger, 1893 



Massilina Schlumberger (Genotype, by designation, Quinqueloculina secans 

 d'Orbigny), M6m. Soc. Zool. France, 1893, p. 218. — Cushman, Special 

 Publ. No. 1, Cushman, Lab. Foram. Res., 1928, p. 149. 



Quinqueloculina (part) d'Orbigny, Ann. Sci. Nat.," vol. 7, 1826, p. 303. 



Miliolina (part) of Authors. 



Test with the early chambers quinqueloculine, later ones added on 

 opposite sides in a single plane, the quinqueloculine stage present 

 in both megalospheric and microspheric forms; aperture simple, with 

 a bifid tooth. 



Cretaceous to Recent (probably older). 



This genus has developed from Quinqueloculina by the addition of 

 the chambers in a single plane. It may be distinguished from Spiro- 

 loculina which is a more specialized genus having most of the char- 

 acters in the microspheric form in a single plane and normally all of 

 these in the megalospheric form in one plane. 



