78 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
Biloculina denticulata H. B. Brady. 
Biloculina ringens (Lamarck) var. denticulata H. B. Brady, Rep. Voy. Challenger, Zoology, 
vol. 9, 1884, p. 143, pl. 3, figs. 4, 5. 
Buloculina denticulata Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 180, pl. 33, fig. 1; 
Proc. U.S. Nat. Mus., vol. 59, 1921, p. 74. 
Although not occurring in any such numbers as the preceding 
species, Biloculina denticulata has occurred at most of the stations 
from which material was studied. It is smaller and does not reach 
the fine development common in shallow water of the East Indies 
and Philippine regions. The largest Tortugas specimens are about 
0.80 mm. The denticulate border at the base is not always present, 
but the general shape and character of the specimens, even without 
this, prove their identity. 
Biloculina denticulata H. B. Brady var. striolata H. B. Brady. 
Biloculina ringens (Lamarck) var. striolata H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 
9, 1884, p. 143, pl. 3, figs. 7, 8.—Millett, Journ. Roy. Micr. Soc., p. 1898, 262, 
Be fig. 8.—Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 80, pl. 33, figs. 
There are a few specimens of this striate variety which differ from 
the usual form in having the markings over the entire test rather 
than the basal portion only. In addition, there are a few specimens 
referred here which may not be this variety. They have a much 
more rounded form at the base rather than the compressed plate- 
like form so common in the typical. 
Genus PENEROPLIS Montfort, 1808. 
The treatment of the Tortugas material of this genus follows that 
which I have already used in a paper on the Foraminifera of the 
north coast of Jamaica (Proc. U. 8. Nat. Mus., vol. 59, 1921). This 
in turn largely followed the treatment of the species given by 
Heron-Allen and Earland in their paper on the Foraminifera of the 
Kerimba Archipelago (Trans. Zool. Soc. London, vol. 20, 1915). 
These various species seem distinct in the Tortugas collection. 
Peneroplis pertusus (Forskal). 
Nautilus pertusus Forskal, Deser. Anim., 1775, p. 125, No. 65. 
Peneroplis pertusus Jones, Parker, and Brady, Foram. Crag., 1865, p. 19.—H. B. Brady, 
Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 204, pl. 13, figs. 16, 17—Cushman, 
Proc. U. S. Nat. Mus., vol. 59, 1921, p. 75, pl. 18, figs. 7, 8. 
Peneroplis elegans d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, “‘ Forami- 
niféres,”’ p. 61, pl. 7, figs. 1, 2. 
This is one of the least common of the species found in this col- 
lection. It was not common in the Jamaican material either, and 
is evidently not as common in the West Indian region as in some 
parts of the Indo-Pacific. The species described by d’Orbigny as 
P. elegans seems undoubtedly to be this species. D’Orbigny had 
this from both Cuba and Jamaica. 
