FORAMINIFERA OF THE NORTH PACIFIC OCEAN. 15 



various sizes are found in the material, suggesting that there must be 

 some increase in size. 



This is one of the commonest of the pelagic species and has the 

 sarcode extended in a living condition into the bubblelike form 

 already referred to here. Various double forms and some with a 

 second chamber showing are occasionally found, and these seem to 

 simply show specimens in which the last formed chamber has not 

 entirely inclosed the preceding ones, similar to Biloculina sphsera. 

 One such specimen is figured on plate 7 as fig. 2. 



Genus HASTIGERINA Wyville Thomson, 1876. 



Plate 8. 



Nonionina (part) d'Orbigny, Foram. Amer. Merid., 1839, p. 27. 



Lituola (part) Jones and Parker, Quart. Journ. Geol. Soc, vol. 16, 1860, p. 302, 



table No. 181. 

 Globigerina (part) Parker and Jones, Philos. Trans., vol. 155, 1865, p. 366. 

 Hastigerina Wyville Thomson (type, Hastigerina pelagica (d'Orbigny)), Proc. 



Roy. Soc, vol. 24, 1876, p. 534. — H. B. Brady, Rep. Voy. Challenger, Zoology, 



vol. 9, 1884, p. 612. 



Description. — Test composed of numerous chambers arranged in 

 planospiral manner, inflated; surface with numerous spines, aperture 

 large, broad oval at the inner margin of the chamber. This genus 

 represented by the following species is essentially pelagic. 



HASTIGERINA PELAGICA (d'Orbigny). 

 Plate 8. 



Nonionina pelagica d'Orbigny, Foram. Amer. Merid., 1839, p. 27, pi. 3, figs. 

 13, 14. 



Lituola pelagica Jones and Parker, Quftrt. Journ. Geol. Soc, vol. 16, I860, 

 p. 302, table, No. 181. 



Globigerina pelagica Parker and Jones, Philos. Trans., vol. 155, 1865, p. 366. 



Hastigerina pelagica H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 77; 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 613, pi. 83, figs. 1-8.— Egger, 

 Abh. kon. bay. Akad. Wiss. Miinchen, CI. n, vol. 18, 1893, p. 372, pi. 13, 

 figs. 53, 54.— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 324, pi. 70, fig. 4.— 

 Sllvestri, Mem. Pont. Accad. Nuovi Lincei, vol. 15, 1899, p. 273, pi. 5, 

 fig. 9. — Rhtjmbler, in Brandt, Nordisches Plankton, 1900, p. 29, fig. 31. — 

 Mlllett, Journ. Roy. Micr. Soc, 1903, p. 691. 



Hastigerina murrayi Wyville Thomson, Proc. Roy. Soc, vol. 24, 1876, p. 534, 

 pis. 22, 23. 



Description. — Test composed of numerous inflated, subglobular 

 chambers in a spiral form, umbilicate, chambers increasing in size 

 progressively as added, sutures much depressed; wall very thin and 

 transparent, clothed with long slender spines which are serrate, espe- 

 cially toward the base; aperture a large, arched, oval opening at the 

 inner border of the chamber. 



Diameter of test without spines up to 1.3 mm. 



