SOME NONIONIDAE IN THE COLLECTIONS OF THE 

 ALLAN HANCOCK FOUNDATION 



(Plates 17-20) 

 Joseph A. Cushman and Irene McCulloch 



This is the third of a series of papers presenting the results of studies 

 being made on the foraminiferal collections of the Allan Hancock Foun- 

 dation, The University of Southern California. 



In the first of these reports the localities for bottom samples were 

 organized into definite tables (See pp. 3-30). The bottom samples col- 

 lected since 1939, together with a special collection of earlier bottom 

 samples procured by Miss Louise Hathaway, a student of The University 

 of Southern California, are organized into tables in this report as continu- 

 ations of those on pp. 3-30. Owing to the increasing number of mud 

 samples from scattered areas under the heading of "Miscellaneous," these 

 are now numbered as the "6" series. 



Family Nonionidae 



Genus NONION Montfort, 1808 

 Nonion depressulum (Walker and Jacob), van matagordanum 



Kornfeld 

 Plate 17, Fig. 1 



Nonion depressulum (Walker and Jacob), var. matagordanum Korn- 

 feld, Stanford Univ., Dept. Geology, Contr., vol. 1, 1931, p. 87, pi. 13, 

 figs. 2a, ^.—Cushman, U.S. Geol. Survey Prof. Paper 191, 1939, p. 21, 

 pi. 5, fig. 26. 



Test nearly circular in side view, much compressed, periphery broadly 

 rounded; chambers 8 to 10 in the adult coil, of uniform shape and very 

 gradually increasing in size as added, broadly triangular in side view, very 

 slightly inflated; sutures distinct, only slightly depressed, gently curved; 

 wall smooth, distinctly but finely perforate, the umbilical region filled in 

 with secondary shell material, projecting slightly between the sutures, 

 and very slightly papillate; aperture a low opening at the base of the 

 last-formed chamber. 



Diameter 0.25-0.30 mm; thickness 0.11-0.14 mm. 



Stations: C-12, 1007. 



Distribution. — This variety occurs in rather typical form at Station 

 C-12, Morro Bay, California, in 2 fms. ; at Station 1007, ofif Santa Bar- 

 bara Island, in 54 fms. The types are from the Gulf of Mexico off the 

 coast of Texas. 



[ 145 ] 



JAN 1 1 1fil 



