170 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



Elphidium incertum (Williamson), van lene Cushman and 



McCulloch, new variety 



Plate 19, Fig. 2 



Variety differing from the typical in the broader chambers, more com- 

 pressed test, and higher apertural face. 



Holotype of variety (AHF no. 37) from locality C-1 1. 



This variety from the available material seems to be related to 

 E. incertum (Williamson). 



The peculiar form (Plate 19, Fig. 4) may be also related to this 

 variety, but material is not in sufficient quantity to give a complete series 

 to show the full amount of possible variation. 



Stations: A-1, A-2, A-15, V-3, C-13, 56, 1017, 501. 



Distribution. — Type locality, Station C-11, Gaviota Pier, 8 fms. Ad- 

 ditional localities indicate a range from Wrangell, Alaska, southward to 

 La Libertad, Ecuador, in shallow waters. 



Elphidium tumidum Natland 

 Plate 19, Figs. 3, 5 



Elphidium tumidum Natland, Bull. Scripps Instit. Oceanography, 

 Tech. Sen, vol. 4, 1938, p. 144, pi. 5, figs. 5, 6. 



Elphidium hughesi Natland (not Cushman and Grant), 1. c, vol. 3, 

 1933, line 5 (table). 



Test nearly circular in side view, somewhat depressed, periphery 

 broadly rounded, lobulate, umbilical region depressed, roughened with 

 minute papillae; chambers distinct, inflated, 10 or 11 in the adult coil, 

 of uniform shape, broadly triangular in side view, increasing very grad- 

 ually in size as added; sutures very distinct, depressed, slightly curved, 

 retral processes short but numerous; wall finely arenaceous, smooth ex- 

 cept in the umbilical region where the surface is papillate; aperture at the 

 base of the last-formed chamber, usually composed of several small open- 

 ings. 



Diameter 0.50-0.60 mm; thickness 0.22-0.30 mm. 



This species was described from off the coast of California and is 

 recorded from the Pleistocene and Pliocene of southern California. 



Stations: A-3, A-5, A-8, A-20, A-22, A-23, V-3, C-1, C-5, 61, 64, 

 81, 102, 103, 109, 110, 111, 113, 114, 127, 132, 133, 136, 2056, 313, 

 501. 



Distribution. — These localities indicate a continuous distribution 

 from the region of Cordova, Alaska, southward to La Libertad, Ecuador, 

 in shallow waters. 



