FORAMINIFERA OF THE ATLANTIC OCEAN 35 



length; septal faces ventricose, especially that of the final chamber; 

 sutures excavated. Superior face hispid externally, inferior smooth; 

 umbilicus deeply sunk, valvular flaps but little developed. Diameter, 

 about one-fiftieth inch (0.5 mm.)." 



Brady described and figured this species from Challenger dredgings 

 off Bermuda, 435 fathoms. His type figures are copied here. In 

 addition he records it from off Gomera, Canaries, 620 fathoms; off 

 the Azores, 450 fathoms; and off Raine Island, 155 fathoms. 



There are a few other records for this species, but the figures where 

 given do not seem to correspond well with those of Brady. 



LAMARCKINA SCABRA (H. B. Brady) 



Plate 7, figures 6 a-c 



Pvlvinulina oblonga Williamson, var. scabra H. B. Brady, Rep. Voy. Chal-^ 

 lenger, Zoology, vol. 9, 1884, p. 689, pi. 106, fig. 8.— Woodward, The 

 Observer, vol. 4, 1893, p. 177. — Sidebottom, Mem. Proc. Manchester Lit. 

 Philos. See., vol. 53, No. 21, 1909, p. 6, pi. 3, figs. 3, 4; vol. 54, No. 16, 

 1910, p. 27. — Heron-Allen and Earland, Trans. Zool. Soc. London, 

 vol. 20, 1915, p. 714.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 5, 1915, p. 

 53, pi. 27, fig. 5. 



Test unequally biconvex, dorsal side much flattened, ventral side 

 more convex, peripheral margin acute, carinate; chambers seven or 

 eight in the final whorl, rapidly increasing in size and length as added, 

 on the ventral side the last-formed chamber in the adult taking up 

 at least one-half the area of the test; sutures slightly depressed, limbate 

 above and below; wall rugose or granular on the dorsal side, smooth 

 below. 



Diameter, 0.5 mm. 



Brady's records for this species in the Challenger dredgings include 

 a station off Bermuda in 435 fathoms and west of the Azores in 1,000 

 fathoms. It is recorded from the Indo-Pacific also. The figured 

 specimen is after Brady, but is from the Pacific. I have had no typical 

 specimens from the Atlantic, and none are figured. 



LAMARCKINA ATLANTICA, new species 



Plate 7, figures 7 a-c 



Test slightly longer than broad, biconvex, ventral side the more 

 strongly convex, umbilicate, periphery keeled and subacute; cham- 

 bers rapidly increasmg in size as added, the last-formed chamber on 

 the ventral side making up nearly half the area of the test; sutures 

 slightly limbate, slightly depressed on the dorsal side, more strongly 

 so on the ventral side; wall very slightly roughened on the dorsal side, 

 smooth and polished on the ventral side; aperture at the umbilical 

 end of the chamber ventrally. 



