38 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Loxostoma vertebrale Cushman, Cushman Lab. Foram. Res. Special Publ. No. 9, 

 p. 194, pi. 22, figs. 14, 15, 1937. 



Test very elongate, slender, 5 to 6 times as long as broad, tapering 

 from the subacute initial end, but very gradually, much twisted, in 

 some adult specimens making a complete turn, periphery lobulate; 

 chambers numerous, distinct, somewhat inflated, in the adult higher 

 than broad, basal margin in the- adult typically projecting above 

 the previous chamber; sutures distinct, somewhat limbate in the early 

 portion, deeply depressed in the adult; wall in the early stages with 

 indistinct, longitudinal costae, in the later chambers smooth, except 

 near the lower margin, which has numerous, very short, fine spines; 

 aperture in the adult tending to become terminal, elongate, curved, 

 with a slight lip. Length, up to 0.75 mm.; breadth, 0.15 mm. 



A few specimens occurred in our material from Vavau Anchorage, 

 Tonga Islands, 18 fathoms; from Rotonga, 7 fathoms; and from off 

 Nairai, 12 fathoms. The species is easily confused with L. convallarium 

 (Millett). 



LOXOSTOMA KARRERIANUM (H. B. Brady) var. CARINATUM (Millett) 



Plate 10, Figure 7 



Bolivina karreriana H. B. Brady var. carinata Millett, Journ. Roy. Micr. Roc, 

 1900, p. 546, pi. 4, figs. Sa, 6.— Cushman, U. S. Nat. Mus. Bull. 71, pt. 2, 

 p. 41, figs. 66a, 6, 1911; Bull. 100, vol. 4, p. 132, pi. 27, fig. 1, 1921.— Hanzawa, 

 Jap. Journ. Geol. Pal., vol. 4, p. 39 (table), 1925 (1926). 



Loxostoma karrerianum (H. B. Brady) var. carinatum Cushman, Cushman Lab. 

 Foram. Res. Special Publ. No. 9, p. 186, pi. 21, figs. 18-20, 1937. 



Variety differing from the typical in the much greater depression of 

 the whole test, the periphery acute and carinate, aperture elongate. 



The only station at which this variety was represented is Albatross 

 H3896, Tekokoto Atoll, 1 mile east, Paumotu Islands, 617 fathoms. 



loxostoma MAYORI (Cushman) 



Plate 11, Figures 1, 2 



Bolivina mayori Cushman, Carnegie Inst. Washington Publ. 311, p. 27, pi. 3, 



figs. 6, 6, 1922; U. S. Nat. Mus. Bull. 104, pt. 3, p. 40, 1922; Carnegie Ints. 



Washington Publ. 342, p. 19, pi. 6, figs. 3, 4, 1924; Publ. 344, p. 76, 1926. 

 Loxostoma mayori Bermudez, Mem. Soc. Cubana Hist. Nat., vol. 9, p. 197, 



1935. — Cushman, Cushman Lab. Foram. Res. Special Publ. No. 9, p. 195, 



pi. 22, figs. 16-21, 1937. 



Test elongate, slender, often arcuate or somewhat twisted, somewhat 

 compressed, periphery rounded, the early portion somewhat tapering 

 but later with the sides nearly parallel throughout their length; 

 chambers numerous, distinct, becoming gradually higher as added until 

 in the later development the height becomes greater than the breadth, 

 and the last-formed chambers uniserial but usually with oblique sutures 

 and somewhat more rounded in form than the early portion; sutures 



