NO. 4 CUSHMAN AND MCCULLOCH : SOME VIRGULININAE 195 



Distribution. — Beginning at the region of San Benito Islands, Mexi- 

 co, in 35 fms. and continuing on around into the Gulf of California with 

 a depth range of 58 to 160 fms. 



Bolivina interjuncta Cushman, var. bicostata Cushman 

 Plate 23, Figs. 9-11, 13-16 



Bolivina costata d'Orbigny, var. bicostata Cushman, Contr. Cushman 

 Lab, Foram. Res., vol. 2, pt. 2, 1926, p. 42. — Cushman and Moyer, I.e., 

 vol. 6, 1930, p. 57. — Bolivina interjuncta Cushman, var. bicostata Cush- 

 man, Special Publ. 9, Cushman Lab. Foram. Res., 1937, p. 116, pi. 22, 

 fig. 23. 



Variety differing from the typical in having the 2 costae nearest the 

 middle most strongly developed, and continued for most of the length of 

 the test, but no anastomosing costae present. 



Some of the Pacific material that has been referred to "Bolivina 

 aenariensis Costa" may belong to this variety. 



There is considerable variation from forms such as Plate 23, Fig. 15, 

 where but 2 costae are present, to the ones with additional lateral costae. 

 The costae in the variety do not anastomose as in the typical form of the 

 species. 



Stations: 55, 82, 200, 215, 217, 230, 251, 261, 409, 422, 506, 516, 

 517, 543, 583, 1078, 2097, 2100, 2101, 2134, 2156. 



Distribution. — The records indicate a range beginning off Catalina 

 in 147 fms., continuing southward along Mexico, into the Gulf of Cali- 

 fornia, the region of the Galapagos Islands, and off Colombia in 10 to 

 225 fms. 



Bolivina laevigata (Williamson) 

 Plate 24, Fig. 1 



Textularia variabilis Williamson, var. laevigata Williamson, Rec. 

 Foram. Gt. Britain, 1858, p. 77, pi. 6, fig. 168. 



Bolivina laevigata H. B. Brady, Journ. Roy. Micr. Soc, 1887, p. 900. 

 — Halkyard, Trans. Manchester Micr. Soc, 1889, pp. 11, 65. — Wright, 

 Proc. Roy. Irish Acad., sen 3, vol. 1, 1889-1891 (1891), p. 474.— Chas- 

 ter, First Rep't Southport Soc. Nat. Sci., 1890-1891 (1892), p. 59.— 

 Halkyard, Trans. Manchester Micr. Soc, 1891 (1892), p. 7 (list).— 

 Wright, Irish Nat., vol. 9, 1900, p. 53 (list) ; Proc. Liverpool Geol. Soc, 

 1901-1902 (1902), p. 183 (list) ; Journ. Isle of Man Nat. Hist. Ant. 



