NO. 1 CUSHMAN, MCCULLOCH : ARENACEOUS FORAMINIFERA 109 



Distribution. — Type locality, Station W-3, Port Angeles, Washing- 

 ton, oif Milwaukee Pier, in 2 fms. The range of this species in so far 

 as the present investigations go, begins off the coast of Alaska, at Nurmy 

 Island, medium low tide, and continues southward to Sechura Bay, 

 Peru, in 12 fms, 



Trochaminina carinata Cushman and McCulloch, new species 



Plate 12, Fig. 3 



Test small, planoconvex, dorsal side convex, ventral side flattened 

 or slightly concave, umbilicate, periphery typically with a thin platelike 

 carina about the basal edge of the chamber, of the same material as that 

 of the wall ; chambers distinct, inflated, well set off from one another 

 on the dorsal side, about six in the adult whorl, ventrally flattened, tri- 

 angular, the inner end often with a distinct lobe; sutures distinct, nearly 

 radial, depressed ; wall finely arenaceous, smoothly finished ; aperture 

 ventral, a low opening at the inner end of the margin of the last-formed 

 chamber. 



Diameter 0.35-0.45 mm. 



Holotype (AHF no. 20) from locality 226. 



This species differs from T. rotaliformis J. Wright in the more 

 rounded chambers, nearly radial sutures and the peripheral keel. The 

 keel is very thin and delicate, and is easily broken away. The species 

 occurs at the following stations: 226, 2064, 2063, 2067, 2065, 2036, 

 2070, 2005, 461, 275. 



Distribution. — Type locality, off Guadalupe Island, in 96 fms. From 

 this region southward, including the Gulf of California, to Tagus Cove, 

 Albemarle Island, in 80 fms. 



Trochammina plicata (Terquem) 



Patellina plicata Terquem, Ess. Anim. Plage Dunkerque, pt. 2, 

 1876, p. 72, pi. 8, figs. 9a, b. 



Trochammina plicata Balkwill and Wright, Journ. Micr., vol. 3, 

 1884, p. 26, pi. 1, fig. 8. — Halkyard, Trans. Ann. Rept. Manchester 

 Micr. Soc, 1889, p. 69, pi. 1, fig. 11.— J. Wright, Proc. Roy. Irish 

 Acad., sen 3, vol. 1, 1891, p. 469. — Millett, Journ. Roy. Micr. Soc, 

 1899, p. 363, pi. 5, fig. 13.— Heron-Allen and Earland, Proc. Roy. 

 Irish Acad., vol. 31, pt. 64, 1913, p. 51; Trans. Zool. Soc. London, 

 vol. 20, 1915, p. 619; Trans. Linn. Soc. London, vol. 11, pt. 13, 1916, 



