80 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



The only well-characterized adult material I have had is from 

 Nero station 1012 in 1,932 fathoms, between Guam and Japan, and 

 Nero 1466 in 234 fathoms off Guam. 



In many of the specimens of this species as shown by Schlum- 

 berger, the adult does not reach the complete biloculine development, 

 but still retains a modified triloculine condition even in its last whorl. 

 Such conditions are seen in many of the specimens recorded as 

 B. tubulosa. The fine sand layer incorporated into the outer wall is a 

 very striking characteristic of the species. 



BILOCUXINA DENTICULATA (H. B. Brady). 



Plate 33, fig. 1. 



Biloculina ringens (Lamarck), var. denticulata H. B. Brady, Rep. Voy. Chal- 

 lenger, Zoology, vol. 9, 1884, p. 143, pi. 3, figs. 4, 5. 



Description. — Test roughly quadrangular in front view; in end 

 view compressed, biconvex; apertural end broadly rounded; oppo- 

 site end with a series of short irregular teeth; wall smooth; aperture 

 very boad and narrow, extending nearly the whole width of the test, 

 the ends somewhat expanded, tooth long and narrow, making the 

 inner border of the aperture plate-like, somewhat raised above the 

 level of the surface to which it is attached, as is the whole border of 

 the aperture. 



Length, up to 0.90 mm. 



Distribution. — The typical material of this variety came from 

 Honolulu coral reefs, Hawaiian Islands, in 40 fathoms; off Tonga- 

 tabu, Friendly Islands, in 18 fathoms, and off the Admiralty Islands, 

 in 15 to 20 fathoms. Millett records it from the Malay region. It 

 seems, therefore, in its typical form to be an East Indian species and 

 its relation to the Eocene B. ringens only remote. 



The best material I have had is from shallow water in Apra Bay, 

 Guam. 



BILOCULINA DENTICULATA (H. B. Brady), var. STRIOLATA (H. B. Brady). 



Plate 33, figs. 2, 3. 



Biloculina ringens (Lamarck), var. striolata H. B. Brady, Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 143, pi. 3, figs. 7, 8. — Millett, Journ. Roy. Micr. 

 Soc, 1898, p. 262, pi. 5, fig. 8. 



Description. — General form similar to the typical B. denticulata, 

 but with the added character of a definite surface ornamentation 

 consisting of a series of costae on the lower half of the penultimate 

 chamber, occasionally on the ultimate also. 



Length, up to 0.85 mm. 



Distribution.— Brady described this variety from a few stations 

 among the islands off the southern shores of New Guinea, just west 



