26 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
chamber is opposite the peripheral angles, as in our specimens, and 
the longitudinal coste 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 limit 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. Goés 
evidently had this species from the Caribbean, referring it first to 
B. costata and later to B. caribea. 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. Soc., vol. 49, No. 5, 1905, p. 15, pl. 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 punctz, 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 costs, 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 
