NO. 2 LALICKER AND MCCULLOCH : TEXTULARIIDAE 137 



Test rhomboidal in front view, very much compressed, thickest in 

 central portion, with a raised ridge commonly developed at the initial 

 end, extending along the central part of the test nearly to the apertural 

 end in some specimens, in others only a short distance above the initial 

 end ; chambers numerous, low and broad, slightly inflated ; sutures dis- 

 tinct, depressed, curving downward sharply near the peripheral margin 

 of test, in adult specimens chambers overlapping somewhat like uniserial 

 chambers at the apertural end ; wall arenaceous, smoothly finished, com- 

 posed of fine sand grains and rather large sand and magnetite grains in 

 some specimens; aperture normally developed as a long slit at the base of 

 the inner margin of the last-formed chamber with the slit parallel to the 

 flattened sides, in adult specimens sometimes a multiple aperture with as 

 many as fifteen openings being developed on the end of the last-formed 

 chamber above the inner margin of the chamber, apparently formed by 

 bridgelike structures growing across the narrow slitlike aperture. Length, 

 up to 3.00 mm. ; width, up to 2.00 mm. ; thickness, 0.50 mm. 



This species was originally described by Cushman from the Miocene 

 of the Panama Canal Zone. It is veiy abundant in the Miocene of Mex- 

 ico, Texas, and Louisiana and has been noted at the following Hancock 

 Expedition stations: 202, 203, 215, 317, 318, 325, 327, 329, 331, 332, 

 502, 503, 504, 509, 556, 558, 577, 578, 579, 2026, 2027, 2038, 2041, 

 2046, 2048, 2054, 2055, 2056, 2059, 2060, 2061, 2062, 2073, 2075, and 

 2078. 



A large number of specimens from the Esperson well, Cameron Co., 

 Texas, have been examined by the senior author. They are very similar to 

 specimens of Textularia panamensis Cushman from the Miocene of Mex- 

 ico and the Panama Canal Zone and should be assigned to that species. 



Distribution. — Numerous stations in the Gulf of California with a 

 depth range of 2-32 fms., southward off Central America, Ecuador, and 

 Peru, in 9 to 47 fms. 



Textularia plaga Lalicker and McCulloch, new species 

 Plate 15, Figs. \9a, b, c 



Test small, short and broad, initial end pointed, expanding very 

 rapidly to the apertural chambers, thickest in central portion and at aper- 

 tural end, peripheral margin compressed, acute; chambers few, low in 

 early portion and very high in adult portion, highest at the center of the 

 test, rapidly decreasing in height toward the periphery ; sutures indistinct, 



