TEXTULARIIDAE—TEXTULARIA; BIGENERINA; BOLIVINA. 25 
Genus BIGENERINA d’Orbigny, 1826. 
Bigenerina nodosaria d’Orbigny. 
(Plate 2, Figures 5, 6.) 
Bigenerina nodosaria d’Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 261, pl. 11, figs. 9-11; 
Modéles, 1826, No. 57. 
Test composed of two portions, the early textularian biserial portion, 
much compressed, generally triangular in front view, followed by a uniserial 
series, the wall arenaceous, usually of calcareous grains, rather neatly 
cemented; aperture in the early portion like that of Textularia, in the uniserial 
portion becoming central, terminal, generally circular; color grayish-white. 
Length of the Tortugas specimens up to 1.5 mm. 
There seem to be two distinct forms in this species, developed in 
the Tortugas collection. The first is like that figured by d’Orbigny 
and others, in which the early textularian portion is broad, making 
up in length about one-half of the entire test, followed by 3 or more 
chambers, circular in cross-section, but whose diameter is con- 
siderably less than that of the early portion; the second form (which 
is common in this collection from the Tortugas) has a biserial 
portion, very small, and which may be followed by 6 or more cham- 
bers in a uniserial arrangement, increasing in size as added and 
becoming considerably greater in diameter than the early biserial 
portion. It may be that these represent the first megalospheric and 
the second microspheric form of a single species, both forms usually 
occurring together and the specimens being clearly one or the other 
without intermediate forms. This species is one of the commonest 
in the collection, and it seems strange that d’Orbigny had nothing 
in his Cuban monograph which can be definitely referred to this 
species. 
Genus BOLIVINA d’Orbigny, 1839. 
Bolivina pulchella (d’Orbigny). 
(Plate 1, Figures 8, 9.) 
Sagrina pulchella d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ Forami- 
niféres,”’ p. 150, pl. 1, figs. 23, 24. 
Bolivina costata Goés (not d’Orbigny), Svensk. Vet. Akad. Handl., vol. 19, no. 4, 1882, 
p. 71, pl. 4, figs. 129 to 132. 
Bolivina caribea Goés (not d’Orbigny), Bull. Mus. Comp. Zodl., vol. 29, 1896, p. 48. 
Test rhomboid in front view, gradually increasing in width from the 
subacute base, the last-formed two chambers making the maximum width; 
chambers numerous, distinct; sutures slightly depressed, oblique, the outer 
angle of each chamber ending in a spinose point; wall ornamented by long- 
itudinal cost, each ending at the peripheral angle of the chamber in a slight 
projecting spine; wall thin and translucent; aperture elongate, extending 
from the base of the inner margin of the chamber to the distal point of the 
last-formed chamber, usually with a slight elevated lip. 
Length up to 0.4 mm. 
From a study of the Tortugas specimens it seems probable that 
they are the same as that described by d’Orbigny as Sagrina pul- 
chella. In the front view in the original figures the margin of each 
