56 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
retral processes small and numerous in the depressed sutural lines; umbilical 
region depressed, but without any secondary development of shell material; 
wall thin, translucent, finely punctate; aperture a row of small pores at the 
base of the apertural face of the chamber. 
Diameter usually not exceeding 0.60 mm. in the Tortugas specimens. 
D’Orbigny described this species from the shore sands of Cuba and 
Jamaica. Some of the specimens which I have recorded from the 
north coast of Jamaica (Proc. U. 8. Nat. Mus., vol. 59, 1921, p. 62) 
as Polystomella cf. P. striato-punctata are undoubtedly P. poeyana. 
This differs from the ordinary P.striato-punctata of higher latitudes. 
Polystomella discoidalis d’Orbigny. 
(Plate 10, Figures 3, 4.) 
Polystomella discoidalis d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ Forami- 
niféres,’’ p. 76, pl. 6, figs. 23, 24. 
Test equally biconvex; periphery subacute; umbilical region with a fairly 
large boss of clear shell material projecting beyond the general contour of 
the test; chambers numerous, 10 to 14 in the last-formed coil; the periphery 
slightly lobulated in the last-formed portion; sutures little, if at all, depressed, 
retral processes short and numerous; wall translucent, with very numerous, 
closely set puncte, the central boss clear, with a very few large puncte; 
aperture consisting of a row of very small circular openings at the base of 
the apertural face. 
Diameter of the Tortugas specimens up to 1 mm. 
P. discoidalis was described by d’Orbigny from shore sands of 
Cuba and Jamaica, where it was common. Next to P. poeyana, it 
is the most common species of the genus in the Tortugas region. 
This seems related to the much more highly developed P. craticulata 
(Fichtel and Moll), which is especially characteristic of the East Indian 
ery Polystomella macella (Fichtel and Moll) var. 
(Plate 10, Figures 1, 2.) 
I have referred to this species numerous specimens from the Tor- 
tugas region which have the subacute periphery and the retral proc- 
esses longer than the intermediate portion of the chamber, but the 
entire test is less developed than in most specimens referred by 
authors to this species. This may be a varietal form of P. macella, 
or it may be a new species in this region. Similar specimens are 
found in the warmer waters off New Zealand and elsewhere. 
The specimens which I have referred to P. crispa from the Miocene 
of the Coastal Plain (Bull. 676, U.S. Geol. Survey, 1918, pl. 27, figs. 
5 a, b) are probably the same as these recent ones from the Tortugas. 
Polystomella advena, new species. 
(Plate 9, Figures 11, 12.) 
Polystomella subnodosa H. B. Brady (not Minster), Rep. Voy. Challenger, Zoology, vol. 9, 
1884, p. 734, pl. 110, figs. 1 a, b—Chapman, Journ. Linn. Soc. London, Zoology, 
vol. 28, 1902, p. 203.—Millett, Journ. Roy. Micr. Soc., 1904, p. 604.—Bagg, Proc. 
U. S. Nat. Mus., vol. 34, 1908, p. 165.—Heron-Allen and Earland, Trans. Zool. 
Soc. London, vol. 20, 1915, p. 733. 
