100 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.6 



Genus LISTERELLA Cushman, 1933 



Listerella pallida (Cushman) 



Plate 10, Fig. 17 



Clavulina communis d'Orbigny, var. pallida Cushman, Bull. Scripps 

 Instit. Oceanography, Tech. Ser., vol. 1, no. 10, 1927, p. 138, pi. 2, 

 fig. 1. — Cushman, Stewart and Stewart, Trans. San Diego Soc. Nat. 

 Hist., vol. 6, 1930, p. 52, pi. 1, figs. 7, 8.— R. E. and K. C. Stewart, 

 Bull. Amer. Assoc. Petr. Geol., vol. 14, 1930, p. 1448. 



Listerella pallida Cushman, Special Publ. No. 8, Cushman Lab. 

 Foram. Res., 1937, p. 147, pi. 16, figs. 37-39. 



Test elongate, slender, the early portion fusiform, later cylindrical, 

 earliest stage with 4 or 5 chambers, later triserial, then irregularly bi- 

 serial, and in the adult uniserial, rounded in transverse section ; chambers 

 distinct throughout, slightly inflated, those of the adult stage rather 

 low but somewhat irregular in height; sutures distinct, slightly de- 

 pressed; wall finely arenaceous, of light-colored, chalky material, 

 smoothly finished; aperture central, terminal, with a slight neck. 



Length 2.00 mm; diameter 0.40 mm. 



The types of this species are from off the west coast of America but 

 typical species have occurred at only two of our stations 2070 and 227 

 but there are good series from both stations. 



Distribution. — In this investigation this species has been found only 

 off Guadalupe Island, Mexico, in 200-250 fms. 



Listerella bradyana Cushman 

 Plate 10, Figs. 15, 16 



Listerella bradyana Cushman, Special Publ. No. 6, Cushman Lab. 

 Foram. Res., 1936, p. 40, pi. 6, fig. 11 ; I. c, no. 8, 1937, p. 151, pi. 17, 

 figs. 21-23. 



Clavulina com7nunis H. B. Brady (part) (not d'Orbigny), Rep. 

 Voy. Challenger, Zoology, vol. 9, 1884, p. 394, pi. 48, figs. 1, 2, 5 

 (not 3, 4, 7-12).— Cushman, Bull. 161, U. S. Nat. Mus., pt. 1, 1932, 

 p. 16, pi. 4, figs. 3fl, b. — Cushman, Stewart and Stewart, Trans. San 

 Diego Soc. Nat. Hist., vol. 6, 1930, p. 51, pi. 1, figs. 5, 6. 



Test elongate, cylindrical, not tapering; chambers numerous, fairly 

 distinct, increasing somewhat in height as added, the apertural face 

 strongly convex; sutures fairly distinct, slightly if at all depressed; wall 

 arenaceous, slightly roughened on the exterior; aperture terminal, cen- 

 tral, with a distinct neck. 



