FOEAMINIFEEA OF NORTH PACIFIC OCEAN. 83 



Distribution. — Brady described this species from specimens from 

 two localities: Off the Ki Islands, southwest of New Guinea, 129 

 fathoms, and on the coral reefs of Honolulu, Hawaiian Islands, 40 

 fathoms. 



The species is a peculiar one in many respects, the ornamenta- 

 tion suggesting many of the Tertiary species, but the thickened form 

 and broad rounded edges being distinct. 



The figures and description are from Brady. 



FRONDICULARIA ROBUSTA H. B. Brady, var. REPANDA, new variety. 



Plate 29, figs. 1, 2. 



Frondicularia robusta Bagg (not F. robusta H. B. Brady), Proc. U. S. Nat. Mus., 

 vol. 34, 1908, p. 145. 



Description. — Test compressed, broad, later chambers extending 

 backward, giving the test a broadly fan-shaped form; otherwise like 

 F. robusta H. B. Brady. 



Length up to 2.5 mm. 



Distribution. — Bagg's specimen is of this broad flaring form, found 

 at Albatross station D450S in 495 fathoms off the Hawaiian Islands. 

 I have seen specimens wliich are here figured from Albatross stations 

 H4881 (type-locality) in 316 fathoms and D4922 in 60 fathoms, off 

 the southern part of Japan. 



Type-specimen.— Cat. No. 8550, U.S.N.M. 



This variety lacks the form of the typical, but has the same general 

 character of ornamentation and rounded borders. 



Subfamily 3. POLYMORPHININ^]. 



Test polythalamous; chambers arranged either biserially or in an 

 irregular spiral; surface smooth or variously ornamented; aperture 

 usually r achate. 



This subfamily includes the genus PolijmorpJiina and its closely 

 allied form DimorpJiina. 



Genus POLYMORPHINA d'Orbigny, 1826. 



Polymorphina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 265.— H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 557. 



Description. — Test more or less rounded, usually not equilateral, 

 chambers few, obliquely placed in a more or less spiral arrangement; 

 aperture terminal, usually radiate; wall calcareous, perforate, either 

 smooth or variously ornamented with spines, costse, or tubercles. 



Although there are various modifications of Polymorpliina, the 

 unity of the whole is very well defined, the aperture is usually radiate 

 and the modifications are largely along the lines of ornamentation and 

 the arrangement, number, and form of the chambers. 



