FOBAMINIFERA OF THE NORTH PACIFIC OCEAN. 27 



Distribution. — Brady notes the occurrence of this species as pelagic 

 at Zamboanga, Philippine Islands, and at several points in the vicinity 

 of the Hawaiian Islands. 

 He also notes its occur- 

 rence as a bottom form 

 in 40 fathoms off the 

 Honolulu coral reefs, 

 Hawaiian Islands. 

 Rhumbler records the 



Species irom L/aysan f ig . 29.— Tretomphalus bulloides (d'Orbigny). a, ventral 

 Island view; b, dorsal view; c, side view. (After d'Orbigny's 



_ - TYPE FIGURE.) 



I nave had material 

 from but one station, Nero station 12, also near the Hawaiian Islands. 



From Brady's notes in the Challenger Report apparently both mega- 

 lospheric and microspheric forms were taken by the Challenger. 



Genus PLANORBULINA d'Orbigny, 1826. 



Planorbulina d'Orbigny (type, P. mediterranensis d'Orbigny). Ann. Sci. Nat., 

 vol. 7, 1826, p. 280.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 655. 



Description. — Test typically adherent; early chambers in a close 

 coil, later chambers surrounding the periphery in an annular arrange- 

 ment; chambers in a single layer; test attached by its dorsal side, 

 noninvolute; all chambers usually visible from either dorsal or ventral 

 side; wall perforate, often rather coarsely so; aperture in the early 

 chambers single on the inner border of the chamber in the coiled 

 chambers, in those arranged in an annular manner usually two, one 

 at either end of the chamber and near the preceding chambers adja- 

 cent and together forming a series of apertures about the periphery 

 of the test; each newly added chamber connects with the two adjacent 

 chambers at either side in the series next previously formed. 



This genus in its restricted sense includes only those species which 

 have the peculiar annular arrangement of the chambers in adult 

 growth. The number of species is small, most common in the shallow 

 waters of Temperate and Tropical seas. 



PLANORBULINA LARVATA Parker and Jones. 

 Plate 8, fig. 2. 



Planorbulina vulgaris d'Orbigny, var. larvata Parker and Jones, Ann. Mag. 

 Nat. Hist., ser. 3, vol. 5, 1860, p. 294. 



Planorbulina larvata Parker and Jones, Philos. Trans., vol. 155, 1865, p. 379, 

 pi. 19, fig. 3a, b— Carter, Ann. Mag. Nat. Hist., ser. 4, vol. 19, 1877, p. 214, 

 pi. 13, fig. 16.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 658, pi. 92, figs. 5, 6. — Egger, Abh. kon. bay. Akad. Wiss. Munehen, 

 CI. 11, vol. 18, 1893, p. 381, pi. 14, fig. 31.— Millett, Journ. Roy. Micr. Soc, 

 1904, p. 490. 



Description. — -Test typically attached, disco idal; chambers of the 

 central portion hidden by the development of thick granules or 



