52 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



The types are from Vavau Anchorage, Tonga Islands. It is a small 

 species and probably has been overlooked but is distinctly biserial 

 like other members of this genus. 



Genus SIPHOGENERINA Schlumberger, 1883 



Siphogenerina Schlumberger, Feuille Jeun. Nat., aim. 13, p. 117, 1883. 

 Sagrina (part) of authors (not d'Orbigny). 



Genotype. — By designation, Siphogenerina costata Schlumberger. 



Test elongate, cylindrical, with the early stages typically triserial, 

 rounded in section, later imiserial; wall calcareous, perforate; aperture 

 in the adult terminal, with a distinct neck, phialine lip and internal 

 tube. Eocene to Recent. 



This genus is well developed in the Pacific and shows three of the 

 principal developments of ornamentation in the group, longitudinally 

 costate, finely spinose, and strongly pitted. Some of the specimens 

 are very similar to Rectobolivina and perhaps should be placed in that 

 genus, which is one closely allied to Siphogenerina but derived evi- 

 dently from Bolivina. There is a great difference in the microspheric 

 and megalospheric forms in the shape of the test, which in the micro- 

 spheric has a sharply tapering base, while the megalospheric form is 

 broadly rounded at the base. 



SIPHOGENERINA VIRGULA (H. B. Brady) 



Plate 15, Figures 2, 3 



Sagrina virgula H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, p. 275, pi. 8, 

 figs. 19^-21, 1879; Rep. Voy. Challenger, Zoology, vol. 9, p. 583, pi. 76, figs. 

 4-7 (not 8-10), 1884.— MiLLETT, Journ. Roy. Micr. Soc, 1903, p. 271.— 

 Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 20, p. 676, 

 pi. 51, figs. 4, 5, 1915. — SiDEBOTTOM, Journ. Roy. Micr. Soc, 1918, p. 148. — 

 Heron- Allen and Earland, British Antarctic {Terra Nova) Exped., Zool- 

 ogy, vol. 6, p. 186, 1922. 



Siphogenerina (Sagrina) virgvla Egger, Abh. kon. bay. Akad. Wiss. Munchen, 

 CI. II, vol. 18, p. 318, pi. 9, fig. 27, 1893. 



Siphogenerina virgula Cushman, Carnegie Inst. Washington Publ. 342, p. 29, 

 pi. 8, figs. 3, 4, 1924; Proc. U. S. Nat. Mus., vol. 67, art. 25, p. 14, pi. 2, 

 figs. 7, 8; pi. 4, figs. 8, 9, 1926. 



Test elongate, somewhat tapering, composed of a number of in- 

 flated chambers, the early ones in a uvigerine arrangement, later ones 

 uniserial, the uniserial portion making up most of the test, surface 

 hispid; aperture large, terminal, with a broad everted lip, the border 

 of which often has a series of backwardly pointing, long, acicular spines. 

 Length, up to 1.75 mm.; diameter, 0.30 mm. 



There is a tendency in many of the specimens to reduce greatly the 

 early stages so that in the megalospheric form nearly the entire test 

 is uniserial. This typically Indo-Pacific species has occurred at a 

 number of stations in our Pacific material, but all from the shoal- 



