FORAMINIFERA OF THE ATLANTIC OCEAN. 75 



Vurioty (Ufl'oring from the tyjHcal in the more compressed form, 

 jind thinner test, probably as suggested by Heron-Allen and EarlarTd 

 a form due to low salhiity of the water hi wliieli it lives. 



DiMribntioti. — Known from the region of the British Isles and 

 not record (h1 elsewhere. 



TROCHAMMINA NITIDA H. B. Brady 



Plate 15, fig. 2. 



TrocJunnniiiKt niti'ln II. B. Bkady, Quart. Joiirn. Micr. Sci., vol. 21, 1881, p. 52; 

 Denkschr. Akad. Wiss. Wien, vol. 43, 1881, p. 100; Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 3:^9, pi. 41, figs. 5, 6.— Goes, Kongl. Svensk. Vet. 

 Akad. Ilandl., vol. 25, No. 9, 1894, p. 30, pi. 6, figs. 225-230.— Millett, 

 Journ. Roy. Micr. Soc, 1899, p. 363. — Awerinzew, Mem. Acad. Imp. Sci. 

 St. Petorf!i)ourg, ser. 8, vol. 29, No. 3, 1911, p. 21.— Pearcey, Trans. Roy. 

 Soc. Ediriburgli, vol. 49, 1914, p. 1011.— IIeron-Allen and Earland, 

 Trans. Zool. Soc. London, vol. 20, 1915, p. G20; Trans. Linn. Soc. London, 

 vol. 11, pt. 13, 1916, p. 228, pi. 40, figs. 19-21. 



Description. — Test small, trochoid, depressed, comj^osed of about 

 three volutions, flattened above, convex below, somevyhat umbilicate, 

 periphery evenly rounded; chambers numerous, about nine in the 

 last formed whorl, all risible from above onl}' those of the last whorl 

 from below, sutures straight or slightly curved, nearly at right angles 

 to the periphery, slightly depressed; wall arenaceous, smoothly 

 finished, aperture a curved slit near the base of the cliamber; color 

 gray brown, the last-formed chamber often light gray. 



Diameter, up to 0.5 mm. 



Disirihution. — This is essentially an Arctic species, recorded from 

 off Fi-anz Josef Land and Nova Zembla, from northern Norway 

 (Brady) a single station and single specimen off western Scotland 

 (Heron-Allen and Earland) and off Prhice Edward Island 50-100 

 fathoms (91-183 meters) and off the Cape Verde Islands, 1 ,070 fathoms 

 (3,109 meters) (Challenger, Brady). Brady gives it from the estuary 

 of the Dee and southwest of Ireland as rare, 40-100 fathoms (73-183 

 meters). Pearcey records it from two stations off the JFalklands in 

 2\ and 56 fathoms (4 and 102 meters). I have failed to find the 

 species in the Albatross material. 



TROCHAMMINA OCHRACEA (Williamson). 



Plate 15, fig. 3. 



Hotalina ochrncea Wimjamsom, Rec. Foram. Great Britain. 1858, p. 55, pi. 4, 

 fig. 112; pi. 5, fig. 113. 



Trochammma oehracea Balkwill and Millett, Journ. Micr., vol. 3, 1884, p. 24, pi. 

 \,\g. 7.— Millett, Journ. Roy. Micr. Soc, 1899, p. 363, pi. 5, fig. 12.— Side- 

 noTTOM, Mem. Proc. Manchester Lit. and Philos. Soc, vol. 49, pt. 2, No. 5, 

 1905, p. 5, pi. 1, fig. 8. — Heron-Allen and Earland, Proc. Roy. Irish, 

 Acad., vol. 31. pt. 64, 1913, p. 51; Trans. Zool. Soc, London, vol. 20, 1915, 

 p. 618, pi. 46, figs. 27. 28; Trans. Linn. Soc, London, vol. 11, pt. 13, 1916, 

 p. 227. 



