30 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



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 porcelaneous, 

 in adults covered with sand grains ; aperture composed of numerous 

 pores, or radiate, typically cribrate. Length, 1.5-2.2 mm.; breadth, 

 0.8-1 mm. 



The species is abundant in the Fiji Islands at Mokaujar Anchorage, 

 but it has not occurred in the other shallow-water collections. There 

 is a specimen from Albatross Station H3875, half a mile off south- 

 west point of Tahanae, Paumotus, in 269 fathoms. The bottom char- 

 acter at this station is given as coarse coral sand, and this is un- 

 doubtedly a specimen washed out from shallow water. It is sur- 

 prising that this species did not occur at more localities, as it is 

 widely distributed in the Indo-Pacific. 



Genus MASSILINA Schlumberger, 1893 



Massilina Schlumbeegeb, Mem. Soc. Zool. France, vol. 6, p. 218, 1893. — Ctjshman, 

 Cushman Lab. Foram. Res. Spec. Publ. No. 1, p. 149, 1928 ; U. S. Nat. Mus. 

 Bull. 104, pt. 6, p. 36, 1929. 



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



Miliolina (part) of authors. 



Genotype. — By designation, Quinqueloculina secans d'Orbigny. 



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. 



Some of our specimens show very clearly the development of this 

 genus from Quinqueloculina, the early stages being decidedly quin- 

 queloculine, while the later ones progressively add the chambers 

 more and more in a single plane. The genus may be distinguished 

 from Spiroloculina, which has almost all the chambers in a single 

 plane from the beginning, especially in the megalospheric form. In 

 Massilina all the early chambers are quinqueloculine in both the 

 microspheric and megalospheric forms. Species occur in which the 

 exterior is arenaceous, but most of the species have lost that character 

 and are entirely calcareous. 



MASSILINA ALVEOLINIFORMIS Millett 



Plate 8, Figures 3 a, b 



Massilina alveoliniformis Millett, Journ. Roy. Micr. Soc, 1898, p. 609, pi. 13, 

 figs. 5-7. — Heeon-Allen and Eaeland, Trans. Zool. Soc, London, vol. 20, pt. 

 2, p. 584, pi. 45, fig. 15, 1915. — Cushman, Carnegie Inst. Washington Publ. 

 311, p. 69, 1922 ; Publ. 342, p. 64, 1924 ; U. S. Nat. Mus. Bull. 104, pt. 6, p. 39, 

 1929. 



