402 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



merous, narrow, arched, tubular; the successive convolutions separ- 

 ated by deep depressions on both sides of the test, the interspace 

 being occupied by a thin, horizontal, shelly septum, which is some- 

 times wanting between the later chambers; aperture simple, circular. 



Length, one twenty-second inch (1.2 mm.)." 



Brady's material was from off the Ki Islands, 580 fathoms (1,061 

 meters); off Kandavu, Fiji, 610 fathoms (1,116 meters); and the 

 Mediterranean, 1,200 fathoms (2,200 meters). Egger records the 

 species from off West Africa, but his figure is difficult to make out. 

 Millett records it from the Malay Archipelago, and Chapman from 

 the lagoon at Funafuti. Sidebottom records it from off eastern 

 Australia, 465 fathoms (850 meters), and plate 1, figure 7, certainly 

 seems to be this species. 



In the Philippine material dredged by the Albatross the species 

 has occurred in considerable numbers at D5236, Pacific Ocean, east 

 coast of Mindanao, in 494 fathoms (903 meters), and at six other 

 stations, the depths of all ranging from 230 to 565 fathoms (420 to 

 1,033 meters), with the average 409 fathoms (748 meters). Bottom 

 temperatures of six of these stations range from 40.1° F. to 52.9° F. 

 (4.5° C. to 11.6° C), with the average 45.7° F. (7.6° C). The local- 

 ities represented, besides the one already mentioned, are : Tawi Tawi 

 Group, Sulu Archipelago; off northwestern Panay; east coast of 

 Luzon; and to the southward, Sibuko Bay, Borneo, and Gulf of Boni. 



My friend, Mr. Sidebottom, has sent me some specimens from the 

 coast of Ireland which were identified by Brady as this species. 

 They are much smaller than the Philippine specimens, less elongate, 

 and in one beautifully sectioned specimen there is no "shelly septum" 

 between the chambers. After seeing this material I am inclined to 

 think that the true S. tenuiseptata is largely an Indo-Pacific species. 



One very characteristic feature in adults is the shape of the aper- 

 tural end of the chamber, which becomes free and takes a different 

 line of growth from the rest of the chambers, and also is apt to be- 

 come shorter than the half volution. 



Spiroloculina tenuiseptata — Material examined. 



Locality. 



5 10 00 N. 



8 50 45 N. 



7 34 45 N. 

 11 57 30 N. 

 13 32 30 N. 



4 06 50 N. 



4 53 45 N. 



7 46 00 N. 



119 47 30 E. 



126 26 52 E. 

 126 38 15 E. 

 121 42 15 E . 

 123 58 06 E. 

 118 47 20 E. 



121 29 00 E. 



122 00-00 E., 



Depth 



in 

 fath- 

 oms. 



230 



494 

 380 

 312 

 565 

 347 

 540 

 1,570 



Bot- 

 tom 

 tem- 

 pera- 

 ture. 



• F. 



52.9 



41.2 

 43.0 

 49.3 



44.0 

 40.1 



Character of 

 bottom. 



crs. s., brk. 

 sh. 



fne.gy.s 



gn.m 



gy.m.,glob.. 



gy-m 



gy-m 



gn.m 



gy.m.,glob.. 



Abundance 



Rare. 



Common. 



Few. 



Few. 



Rare. 



Rare. 



Rare. 



Rare. 



