TEXTULARIIDAE — BOLIVINA. 27 



region as represented by this variety, and it may be found to be 

 common in the shallower waters of the tropical Atlantic. 



Bolivina mayori, new species. 

 (Plate 3, Figures 5, 6.) 



Test elongate, somewhat compressed, of nearly uniform width, except in 

 the extreme young; chambers numerous, distinct; sutures depressed; wall 

 thin, translucent, coarsely punctate, especially in the young; chambers in 

 the later portion extending clear across the test, the last-formed chamber in 

 the adults forming the entire width of the test and usually of a less diameter 

 than the preceding; the wall smooth, except in the early portion, which has 

 a few longitudinal costse; aperture in the adult terminal, elongate, extending 

 nearly across the peripheral end of the last-formed chamber with a slight 

 projecting Up. 



Length up to 0.85 nun. 



This species most nearly resembles B. porrecta H. B. Brady, but 

 differs in the more attenuate form and the ornamentation of the 

 early portion. The punctations over a large part of the surface are 

 arranged in longitudinal lines. In old-age specimens the diameter of 

 the test is considerably less in the last-formed chamber than at the 

 maximum width of the preceding chambers. The aperture would 

 place this species in the subgenus Bifarina. It has occurred at 

 nearly half the stations, but not in any considerable numbers. 



These specimens resemble very much Brady's figure in the Chal- 

 lenger Report (plate 53, fig. 14), which he refers to Bolivina nobilis 

 Hantken. A comparison of these with Hantken's original figures 

 shows that the two are probably different species. Brady's speci- 

 mens were all from the South Pacific, and our specimens from the 

 Tortugas are probably identical or very closely related to those of 

 the South Pacific. 



Bolivina striatula, new species. 

 (Plate 3, Figure 10.) 



Test elongate, gradually tapering from the somewhat rounded initial end 

 to the broad apertural end; chambers numerous, distinct, sHghtly inflated; 

 sutures very slightly depressed ; early portion of the test less compressed than 

 the adult, the peripheral margin rounded in the young, sharply angled in the 

 adult, early portion of the test with numerous longitudinal striations occupy- 

 ing about half the length of the test, following the chambers with a very 

 fine reticulate pattern, the final chambers being smooth, hardly punctate. 



Length 0.35 mm. 



This species is peculiar in the three different stages of ornamenta- 

 tion and the development of the test. The early portion is more or 

 less rounded, with numerous fine longitudinal costse, followed by a 

 few more compressed chambers, the surface of which has a very fine 

 reticulate pattern, not seeming to be raised from the surface of the 

 test and yet distinct with a considerable magnification. The last- 



