TROPICAL PACIFIC FORAMINIFERA OF ALBATROSS 33 



MASSILINA MACILENTA (H. B. Brady) 



Plate 8, Figures 4 a, 6 



Hiliolina macilenta H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, p. 



167, pi. 7, figs. 5, 6, 1884. — Chapman, Journ. Linn. Soc. Zool., vol. 28, p. 



399, 1902. 

 Quinqueloculina macilenta Cushman, U. S. Nat. Mus. Bull. 71, pt. 6, p. 55, 



1917. 

 (l)Massilina macilenta Heron- Allen and Earland, Trans. Zool. Soc. London, 



vol. 20, p. 583, pi. 45, figs. 13, 14, 1915. — Cushman, Carnegie lust. 



Washington Publ. 342, p. 64, pi. 24, figs. 3, 4, 1924. 

 Ci)Massilina secans d'Orbigny var. macilenta Millett, Journ. Roy. Micr. Soc, 



1898, p. 609, pi. 13, fig. 4. 



Test nearly circular, much compressed, periphery rounded, early 

 chambers quinqueloculine, later ones spiroloculine ; surface orna- 

 mented by obliquely longitudinal costae; apertural end with a flar- 

 ing lip, aperture elongate. Length, 0.35 mm.; breadth, 0.3 mm.; 

 thickness, 0.1 mm. 



The records for this species show that it is rather definitely limited 

 to the Indo-Pacific regions. It is a very distinctive, although small 

 species, and shows little variation in its characters. Specimens are 

 rare in our material, but represent the following localities : Off Fiji 

 Islands in 12 fathoms, Levuka, and Mokaujar Anchorage; near 

 Niau, and Vavau Anchorage, Tonga Islands, 18 fathoms. 



MASSILINA CRENATA (Karrer) 



Plate 8, Figures 5 a, 6 



Spiroloculina crenata Karrer, Sitz. Akad. Wiss. Wien, vol. 57, p. 135, pi. 1, 

 fig. 9, 1868.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, p. 156, pi. 

 10, figs. 24-26, 1884. 



Massilina crenata Cushman, U. S. Nat. Mus. Bull. 71, pt. 6, p. 57, pi. 20, fig 2, 

 1917 ; U. S. Nat. Mus. Bull. 100, vol. 4, p. 455, 1921 ; Carnegie Inst. Wash- 

 ington Publ. 311, p. 69, pi. 11, fig. 6, 1922; Publ. 342, p. 66, pi. 25, fig. 4, 

 1924 ; U. S. Nat. Mus. Bull. 104, pt. 6, p. 38, pi. 7, fig. 5, 1929. 



Test in its early development quinqueloculine, adult chambers 

 in a single plane, in front view subelliptical, nearly as broad as long, 

 compressed; chambers long and narrow, margin crenulate, due to 

 the regular contractions or plications of the chamber in the adult; 

 aperture rounded. Length, 0.55 mm. ; breadth, 0.35 mm. ; thickness, 

 0.08 mm. 



This is typically an Indo-Pacific species, but there are rare speci- 

 mens from the West Indian region. 



In the present collections the species has occurred at but two 

 stations, at Rangiroa and at Albatross Station H3858, 28° south, 3.5 

 miles east of Ngaruae Pass, Fakarava Atoll, Paumotus. A specimen 

 from the latter station is figured. 



