126 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



CA9SIDULINA OBLONG A Reuss. 



^assidulina oblonga Reuss, Denkschr. Akad. Wiss. Wien, vol. 1, 1850, p. 376, 

 pi. 48, figs. 5, 6.— Egger, Neuos Jahrb., 1857, p. 295, pi. 11, figs. 1-3.— 

 Balkwill and Wright, Proc. Roy. Irish Acad., ser. 2, vol. 3, 1882, p. 447. — 

 Egger, Abh. kon. bay. Akad. Wiss. Miinchen, CI. II, vol. 18, 1893, p. 303, 

 pi. 7, figs. 33, 34.— Chapman, Geol. Brit. Antarctic Exped., vol. 2, 1907-9, 

 pp. 30, 43, 65, pi. 2, figs. 12a, b; Rep. Foram. Siibantarctic Ids., 1909, p. 332 ; 

 Journ. Linn. Soc. London, vol. 30, 1910, p. 405. 



Description. — This species is evidently to be distinguished from 

 C. crassa by the oblong outline, both in front and side views, and by 

 the differences in the surface, wliich is much smoother and more 

 finely punctate than C. oblonga. Brady combined these two species 

 in C. crassa, and most of the subsequent records follow his determi- 

 nations. 



Distribution. — In the Atlantic CassiduUna oblonga is recorded by 

 Balkwill and Wright as very rare off Dublin and Wicklow, Ireland. 

 I have been unable to distinguish it in the Atlantic material that I 

 have examined. 



CASSIDULINA NITIDULA (Chaster). 



PulvinuUna nitidula Chaster, First Rep. Southport Soc. Nat. Sci., 1891 (1892), 



p. 66, pi. 1, fig. 17. — SiDEBOTTOM, Mem. Proc. Manchester Lit. Philos. Soc. 



vol. 53, 1909, p. 9, pi. 4, fig. 2. 

 CassiduUna nitidula Heron-Allen and Earland, Proc. Roy. Irish Acad., vol. 



31, pt. 64, 1913, p. 70, pi. 5, figs. 6-9; Journ. Roy. Micr. Soc, 1916, p. 44; 



Trans. Linn. Soc. London, ser. 2, vol. 11, 1916, p. 241. 



Description. — "Test small, much depressed, highly polished; con- 

 volutions about two in number, there being seven or eight segments 

 in the last; superior surface slightly convex; sutures not depressed; 

 inferior surface concave; aperture large and oblique; periphery 

 acute. Diameter 1.25 mm. The test is so thin that the sutures on 

 the inferior surface are seen through the shell and give it a pseudo- 

 cassiduline appearance." 



"The curious 'engine-turned' appearance of the test, wliich is well 

 exhibited in this figure (pi. 5, fig. 6), and also in Mr. Sidebottom's 

 figure (pi. 4, fig. 2), is not due to the 'sutures of the inferior surface' 

 being seen through the shell, as suggested by Doctor Chaster, or to the 

 ' sutures on the superior and inferior surfaces being curved in opposite 

 directions, ^^ but to the existence of the inferior series of chambers. 

 For greater clearness the chambers of the superior surface have been 

 tinted in figures 6 and 7, the inferior chambers being plain." 



Distribution. — I have not found this species in the Albatross 

 material from the western Atlantic. According to the records it is 

 known from Southport, England, from the Clare Island region of 

 western Ireland, off south Cornwall, and west of Scotland. Side- 

 bottom records it from the Mediterranean and from off Iceland, and 



«• Millett, Trans. R. Geol. Soc. Cornwall, 1894. 



