FORAMINIFERA OF NORTH PACIFIC OCEAN. 



and where the aperture is circular and terminal there is no trace of 

 an indentation. 



As a whole the genus Textularia shows little trace of ornamenta- 

 tion of the test, except in the thickening of the wall at the junction 

 of the chambers and occasionally spines at the earlier end. In a few 

 species there are signs of raised lines of ornamentation. In one group 

 of species there is a tendency to form proliferations at the sides of the 

 chambers, carried to its extreme in T. siphonifera H. B. Brady. These 

 are peculiar modifications of the. test and occur in several species. 



The largest and best-developed species of Textularia are from shal- 

 low water in tropical or subtropical seas, but the various species are 

 widely distributed, both as to depth and latitude, and the geological 

 history of the genus is apparently a long one. 



TEXTULARIA SAGITTULA DeFrance, var. ATRATA. new variety. 



Description.^-Test as a rule broader than in the typical form, the ini- 

 tial end broad and rounded in both the microspheric and megalospheric 



Figs. 2-5.— Textularia sagittula, var. atrata. 2, front view. X 60. 3, end view of another 



SPECIMEN. X 60. 4, VIEW OF MICROSPHERIC PROLOCULUM AND SUCCEEDING CHAMBERS BY TRANSMIT- 

 TED LIGHT, THE EARLY CHAMBERS FORMING A COILED SERIES ABOUT THE PROLOCULUM, THE LATER 

 CHAMBERS ASSUMING THE BISERIAL CONDITION. X 75. 5, MEW OF MEGALOSPHERIC PROLOCULUM AND 

 SUCCEEDING CHAMBERS BY TRANSMITTED LIGHT, THE EARLY CHAMBERS FOLLOWING THE PROLOCULUM 

 IMMEDIATELY' ASSUMING THE BISERIAL CONDITION. X 75. 



forms; sutures between the chambers covered by a dark material much 

 darker than the rest of the test; test otherwise unornamented. 



Length 1 mm., microspheric proloculum 0.04 mm., megalospheric 

 proloculum 0.07 mm. 



Distribution. — This variety occurred in some numbers at Albatross 

 station D4875, in the eastern channel of the Korean Straits, in 59 

 fathoms. (Type, Cat. No. 8329, U.S.N.M.) 



The peculiar dark condition of the material above the sutures was 

 noted in all the specimens from this region. 



