TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 63 



shallow-water collecting as follows: Viva Anchorage, Fiji, 3 fathoms; 

 Vavau Anchorage, Tonga Islands, 18 fathoms; Rangiroa; 7 fathoms, 

 Rotonga; Rutavu; Makemo Lagoon, Paumotu Islands; off Here- 

 heretue; and Port Lotten, Kersail, Marshall Islands. There is a 

 single specimen from Albatross Station H3983, entrance to South 

 Pass, Rongelap, H mile N., in 400 fathoms. 



SPIROLINA ACICULARIS (Batsch) 



Plate 19, Figures 6, 7 



Test very elongate, slender, very slightly tapering, initial end closely 

 coiled consisting of a few chambers, the diameter of which is usually 

 slightly greater than the succeeding uncoiled chambers, early portion 

 somewhat compressed, later uncoiled portion usually circular in 

 transverse section, coiled portion occupying but a very small part of 

 the entire test; chambers distinct, those of the early coiled portion 

 not inflated, later ones much inflated and increasing somewhat in 

 relative length as added; sutures in the early coiled portion distinct, 

 strongly limbate, later ones depressed; wall especially in the later 

 uncoiled portion marked by longitudinal costae which often become 

 slightly beaded; aperture in the adult terminal, sometimes with a 

 sUght neck. Length, up to 2 mm; diameter, 0.1-0.18 mm. 



There are numerous specimens especially in shallow water which 

 seem to be referable to Batsch's species. There seems to be some 

 question as to whether some of these specimens may really belong to 

 the genus Monalysidium. The ornamentation is not so markedly 

 beaded as in Monalysidium. Specimens are fairly abundant about 

 Fiji, 40-50 fathoms; 12 fathoms, Levuka; Mokaujar Anchorage; 

 12 fathoms, Nairai. Specimens occur in fewer numbers in 18 fathoms, 

 Vavau Anchorage, Tonga Islands; 7 fathoms, Rotonga; and very 

 small specimens in Makemo Lagoon, Paumotu Islands. 



Genus MONALYSIDIUM Chapman, 1900 



Monalysidium Chapman, Journ. Linn. Soc. Zool., vol. 28, p. 3, 1900 (as a sub- 

 genus of Peneroplis) . 



Genotype. — By designation, Monalysidium sollasi Chapman. 



Test with the early chambers close coiled, later ones uncoiled in a 

 rectilinear series; wall imperforate, smooth or with vertical rows of 

 minute tubercles; aperture circular, terminal, sometimes with a 

 short neck or lip. Recent. 



MONALYSIDIUM POLITUM Chapman 



Plate 19, Figures 8, 9 



Peneroplis lituus H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, p. 205, pi. 13, 

 figs. 24, 25 (?), 1884. 



