128 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Description. — Test nearly symmetrical, subglobular, early cham- 

 bers spiral, the later ones enveloping the earlier ones, the last-formed 

 chamber in the adult forming half the area of the test, wall arenaceous 



199 



200 



Figs. 198-201.— Ammochilostoma galeata. X 50 (after Brady). 201, apertural view. 



with much cement, smooth; aperture a narrow slit near the base 

 of the apertural face; color yellowish-brown. 



Diameter 0.5 mm. 



Distribution. — There are two Challenger records for this species in 

 the North Pacific, 224 in 1,850 fathoms and 237 in 1,875 fathoms, 

 both in the western Pacific. 



AMMOSPH^ROIDINA, new genus. 



Haplophragmium (part) H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 313. — Howchin, Trans. Roy. Soc. South Australia, vol. 12, 1889, p. 6. — Chap- 

 man, Journ. Linn. Soc, Zool., vol. 30, 1907, p. 24. 



Description. — Test globose, arenaceous, early portion spiral, later 

 chambers like Sphseroidina in form, embracing; aperture rounded, 

 at one side of the chamber in the adult. 



Type of the genus. — Haplophragmium sphseroidiniformis H. B. 

 Brady. 



This genus in its general external characters much resembles 

 Spseroidina, but has a rather coarse arenaceous test. 



AMMOSPHiEROIDINA SPHSEROIDINIFORMIS (H. B. Brady). 



Haplophragmium sphxroidiniformis H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 313.— Howchin, Trans. Roy. Soc. South Australia, vol. 12, 1889, 

 p. 6.— Chapman, Journ. Linn. Soc, Zool., vol. 30, 1907, p. 24, pi. 3, figs. 50, 

 51. 



Description. — Test free, composed of a spiral earlier portion, the 

 later portion in the adult made up of usually three large globose cham- 

 bers similar in form and arrangement to Sphseroidina bulloides, one 

 large one at one side and two smaller ones at the other, the aperture 

 at the inner side of the last-formed chamber semicircular or rounded; 

 wall rather coarsely arenaceous; color brownish or gray. 



Diameter 0.75-1.75 mm. 



