NO. 4 CUSHMAN AND MCCULLOCH: SOME VIRGULININAE 191 



inner margin of the last-formed chamber to the highest point of the 

 chamber. Length up to 0.75 mm.; breadth 0.25-0.30 mm.; thickness 

 0.12-0.15 mm. 



This species is widely distributed in the Pacific and elsewhere and is 

 somewhat variable in shape. 



Stations: C-1 3, 53, 61, 62, 73, 80, 208, 228, 416, 423, 457, 460, 461, 

 466, 468, 469, 470, 472, 500, 534, 535, 539, 574, 1003, 1013, 1017, 1041. 



Distribution. — An analysis of the stations shows a record for Mon- 

 terey Bay, California, 25 fms. ; near Catalina and San Clemente for 10 to 

 25 fms. ; off Mexico in 17 to 50 fms. ; a series of records off Ecuador and 

 Peru in 10 to 100 fms.; and a series of records off the Galapagos Islands 

 in 7 to 80 fms. 



Bolivina costata d'Orbigny 

 Plate 23, Figs, 1-3 



Bolivina costata d'Orbigny, Voy. Amer. Merid., vol. 5, 1839, p. 62, 

 pi. 8, figs. 8, 9; Foram. Foss. Bass. Tert. Vienne, 1846, p. 239, pi. 21, 

 figs. 44, 45. — Cushman, Contr. Cushman Lab. Foram. Res., vol. 2, pt. 2, 

 1926, p. 41, pi. 6, figs. 2a, b; Bull. Scripps Instit. Oceanography, Tech. 

 Sen, vol. 1, 1927, p. 155, pi. 3, fig. 8. — Cushman and Kellett, Proc. U.S. 

 Nat. Mus., vol. 75, art. 25, 1929, p. 8, pi. 3, figs. 9a-c. — Cushman, Special 

 Publ. 9, Cushman Lab. Foram. Res., 1937, p. 122, pi. 15, figs. 4, 5. 



Test small, tapering, about twice as long as broad, broadest toward 

 the apertural end in both front and side views, periphery broadly 

 rounded; chambers numerous, earlier ones low and broad, later ones 

 becoming gradually higher, until, in the last-formed ones, the height is 

 often nearly equal to the breadth, slightly inflated ; sutures somewhat in- 

 distinct, but appearing as irregular, angular lines between the sutures, 

 pointing toward the aperture, since the suture line extends out onto the 

 costae and backward at the same time ; wall very coarsely perforate, with 

 a few, sharp, raised, longitudinal costae, continuous over the sutures, usu- 

 ally 5 or 6 costae on a side, last-formed chambers of each series usually 

 smooth on the outer face; aperture narrow, elliptical, extending in from 

 the base nearly in the median line. Maximum length 0.40 mm. ; breadth 

 0.15 mm.; thickness 0.12 mm. 



This species was described by d'Orbigny from off the west coast of 

 South America. It is abundant off the coast of Peru, and it is interesting to 

 note that all of the stations which have this species are in this same region. 



