THE FAMILY TEXTULAEIID^ 165 



Genus Textularia, Defeance. 



Segments in two rows alternating with each 

 other ; normal aperture an arched slit at the base of 

 the inner wall of the last segment. Cambrian to 

 Recent. 



This genus is very important as a foramini- 

 feral type. Its distribution through almost all the 

 principal fossiliferous rocks is very striking, there 

 being hardly an instance of a foraminiferal fauna 

 without some representatives of the genus. 



Examples. — T. rugosa, Eeuss sp. (Plecanium), 

 ' Sitzungsberichte d. k. Ak. Wiss. Wien,' vol. lix. 

 1869, p. 453, pi. i. lig. 3 a, h. 



This species is easily recognised by the imbricated 

 appearance of the suture lines. It is at the present 

 day a familiar coral-reef species, and attains to quite 

 a large size. The writer has recently found speci- 

 mens dredged at Funafuti, in the Pacific, measuring 

 as much as 5 mm. in length. It is very rarely 

 found in deeper water than 30 fathoms. Oligocene 

 to Recent. (Plate 9, fig. A.) 



T. comjdanata, Reuss sp. (Proroporus), 'Sitzungsb. 

 d. k. Ak. Wiss. Wien,' vol. xl. 1860, pi. '231, pi. xii. 

 figs, o a, b. 



The flattened, complanate textularians have a 

 somewhat modified aperture, which in this particular 

 form appears as a circular aperture placed on a slight 

 prolongation of the upper margin of the last chamber. 

 T. coinplanata is a very restricted species as to age, 

 for it has only been recorded from Cretaceous beds, 



