80 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
Peneroplis cylindraceus (Lamarck). 
Peneroplis cylindraceus H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 205, 
oe i at 20, 21.—Cushman, Proce. U. S. Nat. Mus., vol. 59, 1921, p. 75, pl. 18, 
Single specimens occurred at but two stations. These were in 
very fine sand and in comparatively quiet water. As this is a very 
delicate species, it thay be that its occurrence is much more frequent 
than these records would indicate. In the Jamaican material a 
single specimen only was obtained. 
Peneroplis discoideus Flint. 
Peneroplis pertusus (Forskal) var. discoideus Flint, Rep. U. 8. Nat. Mus., 1897 (1899), 
p. 304, pl. 49, figs. 1, 2.—Cushman, Carnegie Inst. Wash., Pub. 291, 1919, p. 69. 
Peneroplis discoideus Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, p. 76, pl. 18, fig. 20; 
pl. 19, figs. 1 to 3. i 
Very fine specimens of this species, which the late,.Dr. Flint de- 
scribed from Key West Harbor, occurred in the Tortugas region. 
It is widely distributed in the West Indies and is apparently found 
as far back in the fossil series as the Miocene. 
Subgenus MONALYSIDIUM Chapman, 1899. 
Chapman places in this subgenus specimens evidently allied to 
Peneroplis, but. the surface ornamentation, consisting of rows of 
minute tubercles, the early chambers spiral, the later development 
linear. Such specimens have occurred in the Tortugas collection as 
single specimens, only at a few stations. They are so delicately 
brittle that it seems probable that they were broken before they 
were studied.. Heron-Allen and Earland question whether or not 
such forms as are figured here have any spiral early portion. Speci- 
mens which 'they had from the Kerimba Archipelago, east coast of 
Africa, apparently have an aperture at either end of the straight 
test. In the specimens figured by Brady (Challenger report, plate 
13, figs. 24, 25) the chambers are separated by a collar-like portion 
and one end only shows traces of the aperture. Our specimens 
from the Tortugas are very similar to those figured by Brady, except 
in the form of the chambers themselves. These usually are broader 
at the basal end than at the apertural end. In all our specimens one 
end has a distinct aperture with a definite, projecting lip, the other 
end in no case shows such a condition. From the shape of the 
chambers alone it would usually seem possible to orient the specimens. 
Monalysidium polita Chapman? 
(Plate 13, Figure 4.) . 
Peneroplis lituus H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 205, pl. 13, 
figs. 24, 25 (?). 
Peneroplis (Monalysidium) polita Chapman, Journ. Linn. Soc. London, Zoology, vol. 28, 
1902, p. 4, pl. 1, fig. 5 (?). 
Monalysidium polita Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 20, 1915, 
p. 603, text-fig. 43 G. 
