FORAMINIFERA OF THE ATLANTIC OCEAN Ql 



264.— Chapman, Journ. Linn. Soc. Zool., vol. 28, 1900, p. 172.— Sidebot- 

 TOM, Mem. Proc. Manchester Lit. Philos. Soc, vol. 48, No. 5, 1904, p. 6.— 

 Earland, Journ. Quekett Micr. Club, ser. 2, vol. 9, 1905, p. 192.— Bagg, 

 Proc. U. S. Nat. Mus., vol. 34, 1908, p. 119.— Chapman, Journ. Linn. Soc. 

 Zool., vol. 30, 1910, p. 396. — Heron-Allen and Earland, Proc. Roy. 

 Irish Acad., vol. 31, pt. 64, 1913, p. 24, pi. 1, fig. 8.— Chapman, Biol. Res. 

 Endeavour, vol. 3, pt. 1, 1915, p. 6.— Heron-Allen and Earland, Trans. 

 Zool. Soc. London, vol. 20, 1915, p. 557; Trans. Linn. Soc. London, ser. 

 2, vol. 11, 1916, p. 208.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, 

 p. 31, pi. 5, fig. 1. — Sidebottom, Journ. Roy. Micr. Soc, 1918, p. 5. — 

 CusHMAN, Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 398; Publ. 342, 

 Carnegie Instit. Washington, 1924, p. 56. 

 Spiropthalmidium aculimargo Cushman, Contr. Cushman Lab. Foram. Res., 

 vol. 3, 1927, p. 37, pi. 8, fig. 5; Special Publ. No. 1, Cushman Lab. Foram. 

 Res., 1928, p. 165, pi. 20, fig. 7; pi. 21, fig. 5. 



Test oval, much compressed, planispiral throughout, peripheral 

 margin carinate; development consisting of a proloculum followed by- 

 several coils of an undivided second tubular chamber, then by cham- 

 bers a half coil in length separated by a wide flange; wall smooth; 

 aperture rounded, without a tooth. 



Length, 0.75 mm.; breadth, 0.50 mm.; thickness, 0.08 mm. 



There are records for this species from Challenger stations off 

 Bermuda and from the South Atlantic as well as from several 

 stations about the British Isles. As Brady included four species 

 under this name, the records based upon his figures are very doubtful. 

 Some have been excluded as it is definite that they do not refer to 

 the typical form, but most of the others are given above to call 

 attention to them whenever it may be possible to straighten them 

 out from the original collections. I have some beautiful specimens 

 of the form of this species as it occurs about the British Isles through 

 the kindness of Earland. They are from Station 7 of the third cruise 

 of the Porcupine, 48° 18' N., 9° 11" W., in 93 fathoms. They show 

 very clearly the development of the species and a striking resemblance 

 to Jurassic forms. 



SPIROPTHALMIDIUM ACUTIMARGO (H. B. Brady), var. CONCAVA (Wiesner) 



Plate 22, Figures 2a-c 



Spiroloculina acutimargo H. B. Brady, var. concava Wiesner, Zool. Anzeiger, 

 vol. 41, 1913, p. 521. — Heron-Allen and Earland, Trans. Linn. Soc. 

 London, ser. 2, vol. 11, 1916, p. 208, pi. 39, figs. 1-3. 



Variety differing from the typical in the shape of the test which 

 instead of being flattened is deeply concave on one side and convex 

 on the other. 



Heron- Allen and Earland give the following notes on this species: 



Wiesner in his paper (ut supra) records this beautiful little variety, and so far 

 as we are aware, it has not been figured or described in print. He was good 

 enough to send us specimens of his variety from the Adriatic Sea, and its 



