— 
NO. 5 FORAMINIFERA FROM TRINIDAD—SAUNDERS 13 
surface smooth, may be polished. Color brown to fawn. Chambers: 
Slightly inflated dorsally, more strongly so ventrally, especially to- 
ward the umbilicus; five to six, or more rarely seven, in the last 
whorl ; increasing in size regularly and gradually. Sutures: Distinct, 
almost flush with the surface dorsally, depressed ventrally; straight 
or slightly curved. Apertures: Primary aperture: a narrow slit in 
the terminal face of the chamber commencing in an interiomarginal 
position and with its long axis roughly parallel to the dorsal surface. 
In shape it may be a straight slit though it is more usually arcuate 
and may even be slightly sigmoid; though normally parallel sided, 
it is sometimes enlarged toward the ends. Supplementary apertures: 
at the apex of the last chamber is an area, commonly triangular in 
shape, where the wall is perforated by up to 11 or 12 circular, cribrate 
openings. Really well-preserved specimens invariably show these 
cribrate apertures; when not seen, they are presumed to have been 
filled and obscured by foreign matter. The sievelike area of the wall 
forms a weak point in the test which, in many specimens, has been 
broken out leaving one or more irregular holes. In one test the 
cribrate apertures were observed in an earlier chamber of the last 
whorl though normally they are obscured, as was stated by Andersen 
(1951b). Size: Maximum diameter of figured hypotype 0.47 mm., 
thickness 0.18 mm. 
Locality Figured hypotype (U.S.N.M. No. P5113) from sample 
Bo. 261, Ortoire River, east coast of Trinidad, B.W.I. 
Distribution.—This species is exceedingly common and widespread 
in all inshore, brackish-water areas of Trinidad. 
Remarks.—The Trinidad representatives of the species are identical 
to those described by Andersen from Louisiana. 
REFERENCES 
ANDERSEN, H. V. 
1951a. Two new genera of Foraminifera from Recent deposits in Louisiana. 
Journ. Paleontol., vol. 25, No. 1, pp. 31-34, figs. I, 2. 
1951b. An addenda to Arenoparrella and Arenoparrella mexicana (Korn- 
feld). Contr. Cushman Found. Foram. Res., vol. 2, pt. 3, pp. 96-97, 
pl. 11, figs. 4, a-c. 
1953. Two new species of Haplophragmoides from the Louisiana Coast. 
Contr. Cushman Found. Foram. Res., vol. 4, pt. I, pp. 21-22, pl. 4, 
figs. 7, 8. 
Brapy, H. B. 
1884. Report on the scientific results of the voyage of H.M.S. Challenger, 
Zoology, vol. 9, pp. 1-814, pls. 1-115. 
CusumMay, J. A., and BronNIMANN, P. 
1948a. Some new genera and species of Foraminifera from brackish water 
