48 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



No. 16, 1910, p. IS, pi. 2, fig. 8[?] ; Journ. Quekett Micr. Club, vol. 11. 



1012, p. 405. pi. 17, tigs. 2(>-2S[?].— Bagg, Bull. 513, U. S. Geol. Survey, 



3912, p. 50, pi. 14, figs. 19o, b, 20.— Cushman, Bull. 71, U. S. Nat. Mus., 



pt. 3, 1913, p. 35, pi. 14, tig. 9. — Hebon-Allen and Earland, Proc. Hoy. 



Irish Acad., vol. 31, pt. 64, 1913, p. 84; Trans. Zool. See. London, vol. 



20, 1915, p. 662 ; Trans. Linn. Soc. London, ser. 2, vol. 11, 1916, p. 251 ; 



Journ. Roy. Micr. Soc, 1916, p. 46. 

 Lagena marginata (Walkeh and Boys), var. qitadrata Balkwill and 



AVright, Proc. Roy. Irish Acad., ser. 2, vol. 3, 1882, p. 548. 

 Lagena laevigata (Reuss), var. qitadrata Wright, Proc. Roy. Irish Acad., 



ser. 3, vol. 1, 1891, p. 480. 



Description. — Test compressed, somewhat quadrate in outline, 

 usually somewhat keeled ; aperture somewhat elongate ; wall smooth. 



Length up to 0.50 mm. 



Distribution. — This species w^as originally described from ofT the 

 British Isles by Williamson. It has since been recorded from about 

 the British Isles by several authors. There are numerous records 

 for its distribution elsewhere^ but from the specimens I have seen 

 from the western Atlantic and other regions the typical form is best 

 seen in the eastern North Atlantic. 



LAGENA QUADRICOSTULATA Reuss. 



Lagena quadricostulata Reuss, Sitz. Akad. Wiss. Wien, vol. 62, 1870, p. 

 469.— ScHLiCHT, Foram. Pietzpuhl, 1870, pi. 4, figs. 25-30.— H. B. 

 * Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 486, pi. 59, figs. 



7 (?), 15.— Peabcey, Trans. Glasgow Nat. Hist. Soc, vol. 2, 1890, p. 

 177 (?).— Chapman, Proc Zool. Soc London, pt. 1, 1895, p. 29.— 

 Wright, Irish Nat., vol. 9, No. 3, 1900, p. 54. — Earland, Journ. Que- 

 kett Micr. Club, ser. 2, vol. 9, No. 57, 1905, p. 214.— Chapman, Zool. 

 Res. Endeavour, pt. 3, 1912, p. 311. — Pearcey, Trans. Roy. Soc Edinb., 

 vol. 39, 1914, p. 1021. — Chapman, Biol. Res. " Endeavour," vol. 3, pt. 1, 

 1915, p. 22. 



Description. — " Test pyriform and more or less compressed, the 

 margin obtuse or rounded, the base frequently mucronate, and the 

 aperture entosolenian ; the surface bears four arched costae, two on 

 each face of the test, near the lateral margins and parallel to them. 

 The costae ai-e thickest near the middle and taper away toward the 

 ends." 



Length 0.25 mm. 



Distrihution. — The Atlantic records for this species consist of a 

 questionable one of Pearcey as very rare in the Faroe Channel, and 

 from the Summary of Results of the Challenger Expedition, it is 

 recorded from station 13, in the North Atlantic, 1,900 fathoms 

 (3,475 meters). Wright records it as common, with trigonal forms 

 rare, from Dog's Bay, Ireland, and Earland records it from shore 

 sands at Bognor, Sussex, rare. Pearcey records it from Burdwood 

 Bank, in the South Atlantic, 56 fathoms (102 meters), and one 

 deeper station, in 1,998 fathoms (3,654 meters). 



