26 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 



chamber is opposite the peripheral angles, as in our specimens, and 

 the longitudinal costa? are similar, over the projecting point at the 

 basal angle. Our specimens, however, are more compressed than 

 that figured by d'Orbigny in end view and have an entirely different 

 aperture. D'Orbigny shows a small, rounded aperture with a pro- 

 jecting neck at the upper end of the last-formed chamber. In the 

 Tortugas specimens they all have a much elongated aperture, ex- 

 tending from the inner margin to the upper Hmit of the chamber, 

 and at each point there is a projection of the lip at the outer end of 

 the aperture itself. This might easily be mistaken for the character 

 as figured by d'Orbigny if not carefully examined from the apertural 

 end. D'Orbigny's dimensions, 0.5 mm., are closely approximate to 

 that of these specimens from the Tortugas. His original specimens 

 were from the shore sands of Cuba, St. Thomas, and Jamaica. Goes 

 evidently had this species from the Caribbean, referring it first to 

 B. costata and later to B. caribcea. It seems to be fairly common in 

 the Tortugas region, as it has occurred at 6 of the stations. 



Bolivina compacta (Sidebottom). 



(Plate 1, Figure 10.) 



Bolivina robusta H. B. Brady var. compacta Sidebottom, Mem. Proc. Manchester Lit. 



Philos. See, vol. 49, No. 5. 1905, p. 15, pi. 3, fig. 7. 

 Bolivina compacta Cushman, Bull. 71, U. S. Nat. Mus., pt. 2, 1911, p. 36, fig. 58 (in text). 



Test elongate, tapering, periphery rounded, initial end bluntly pointed, 

 apertural end obliquely rounded; chambers numerous, somewhat inflated; 

 sutures very slightly depressed, not very distinct; wall ornamented by a 

 series of large coarse punctae, somewhat irregularly arranged, those of the 

 last-formed chambers finer and more numerous; aperture elongate, extending 

 from the base of the inner margin of the last-formed chamber to the highest 

 point of the chamber; color white. 



Length of the Tortugas specimens 0.5 mm. 



Specimens of this species are extremely rare, a single typical 

 specimen occurring at station 20 in 7 fathoms and another less typ- 

 ical specimen from station 22 in 6 fathoms. Sidebottom originally 

 described this as a variety of Bolivina robusta from the Mediterranean, 

 and I have referred to it specimens from the tropical Pacific. 



Bolivina limbata H. B. Brady var. costulata, n. var. 

 (Plate 3, Figure 8.) 



Variety differing from the typical form of the species mainly in the addition 

 of longitudinal costa?, usually few in number, and near the base of the test. 

 The specimens are almost invariably somewhat twisted as in the typical. 



Length of largest specimen 0.75 mm. 



All of the Tortugas specimens seem to be of this variety. The 

 typical form of the species does not seem to be common in the At- 

 lantic, the only records I have had being from off the coast of South 

 America. This species, however, is fairly common in the Tortugas 



