FOKAMINIFERA OF THE NORTH PACIFIC OCEAN. 53 



Islands. The sections figured by Schlumberger are very interesting 

 in showing the smooth early chambers with the gradual development 

 of the ornamentation, first with a single rib then two with a depres- 

 sion and finally in the adult a chamber with numerous ribs and stria- 

 tums on the peripheral portion. 



QUINQUELOCULINA RUGOSA d'Orbigny. 



Quinqueloculina rugosa d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 302, No. 24. — 

 Schlumberger, Mem. Zool. Soc. France, 1893, p. 210, text figs. 18, 19, pi. 4, 

 figs. 91-93. 



Description. — Test fusiform, quinqueloculine, chambers of the 

 adult quadrangular in transverse section, the periphery flattened and 

 broad, the sides nearly at right angles to the peripheral face; in some 

 cases both periphery and sides somewhat concave; wall slightly 

 rugose, often with fine broken lines; apertural end slightly produced 

 to form a short subcylindrical neck; aperture rounded, with a simple 

 tooth. 



Length, usually slightly less than 1 mm. 



Distribution. — Specimens of this species were found sparingly in 

 material from about the Hawaiian Islands, Nero station 2033 in 249 

 fathoms, 2036 in 82 fathoms, Albatross D4807, in 44 fathoms off 

 Hakodate, Japan, D4900 in the Eastern Sea of Japan; also Tuscarora 

 material from Manila Bay, Philippine Islands, and material from 

 Hongkong Harbor. 



In its early stages the chambers, as shown in figures given by 

 Schlumberger, are smooth and rounded and show nothing of the 

 adult character. This is the rule for species which are angled or 

 ornamented in the adult and exactly what would be the case in any 

 other group of animals. 



QUINQUELOCULINA SUBROTUNDA (Montagu). 



"Serpula subrotunda dorso elevato" Walker and Boys, Test Min., 1784, p. 2, 



pi. 1, fig. 4. 

 Vermiculum subrotundum Montagu, Test Brit., 1803, pt. 2, p. 521. 

 Quinqueloculina subrotunda d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 302, No. 



36. — H. B. Brady, Nat. Hist. Trans. Northumberland and Durham, vol. 1, 



1865, p. 94, pi. 12, fig. 2. 

 Miliola {Quinqueloculina) subrotunda Parker and Jones, Philos. Trans., vol. 155, 



1865, p. 411, pi. 15, fig. 38. 

 Miliolina subrotunda H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 



p. 168, pi. 5, figs. 10, 11. 



Brady records this species from Challenger station 260A, in 40 

 fathoms, coral reefs of Hololulu, Hawaiian Islands, and Rhumbler 

 from both Chatham Island and Laysan. 



