FORAMINIFERA OF THE PHILIPPINE AND ADJACENT SEAS. 409 

 Spiroloculina artillarum, var. angulata. — Material examined. 



SPIROLOCULINA (?) CONVEXIUSCULA H. B. Brady. 



Plate 82, figs. 4a, 6. 



Spiroloculina (?) convexiuscula H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 

 9, 1884, p. 155, pi. 10, figs. 18-20.— Millett, Journ. Roy. Micr. Soc, 1898, p. 

 266. — SiDEBOTTOM, Joum. Roy. Micr. Soc, 1918, p. 6. 



Description. — Test small, compressed, nearly circular in side view, 

 biconvex; early chambers obscured, the later chambers overlapping 

 nearly to the center; chambers ornamented by longitudinal, rounded, 

 more or less interrupted costae; peripheral margin carinate; aperture 

 with a definite lip, rounded or eUiptical. 



Length usually less than 1 mm. 



Brady's material was from two stations — off Raine Island, Torres 

 Strait, 155 fathoms (283 meters), and off the Admiralty Islands, 16 

 to 25 fathoms (29 to 46 meters). Millett records it from the Malay 

 Archipelago, "common and widespread over area 1 (eastern part), 

 but rare in area 2 (west of Borneo)." Sidebottom mentions "a 

 single specimen, which, appears to be typical," from 465 fathoms (850 

 meters), east coast of Australia. 



Millett remarks as follows on this species: 



Assigned by Brady, with some hesitation, to this genus, it is more probably an 

 arrested form of ArticuUna. It is remarkable for its uniformity, specimens from all 

 localities being almost identical in size and structure. 



The aperture and embracing characters would seem to place this 

 species with Vertebralina, but other characters suggest that it be left 

 for the present under Spiroloculina. 



In the Philippine material it has occurred at eight stations, common 

 at two of them. The depths range from 10 to 393 fathoms (18 to 719 

 meters), with the average 76 fathoms (139 meters). The two bottom 

 temperatures given are 75.7'^ F. (24.2° C.) and 43.7° F. (6.5° C). 

 The stations are: China Sea off southern Luzon; Jolo Jolo, Tawi 

 Tawi Group; off Romblon and off eastern Panay. 



It is very evidently' a species of warm, shallow waters of the Indo- 

 Pacific region. 



