478 
Proceedings of Boyal Society of Edinburgh. [sess. 
(Cleve and Moller!); Balearic Islands ; Nancoori; Sta Monica deposit 
(Cleve and Moller!); between Aden and Bab-el-Mandeb ; Mejillones 
guano (Cleve !) ; Alsb-, Felsd-, Esztergaly, K6kko and Szakal 
deposits (Pantocsek !). 
Yar. curvatuloides , Grove MS. — Diam. *1 mm. Markings irregular, 
and smallest on a small round excentric area, elsewhere subequal, 
4J in *01 mm., and in evident fasciculate rows, those in each 
fasciculus parallel to that at its edge ; apiculi minute, inter- 
fasciculate. — Cleve and Moll., Diat ., Nos. 57, 164. 
Through this var. C. vetustissimus is allied to C. curvatulus, var. 
genuina. 
Habitat. — Jackson’s Paddock, Oamaru deposit (Grove !) ; Bich- 
mond, Ya.; Sta Monica deposit (Cleve and Moller !). 
C. atlanticus. Cstr., Diat. Chall. Exped. , p. 158, pi. v. fig. 8. — 
Diam. ’046 mm. Central space and rosette absent. Markings 
round, granular, without order, and with hyaline interspaces from 
the centre to a little beyond the semiradius, thence polygonal, 
subequal, 10 in *01 mm., and in radial subfasciculate rows to the 
border. Border distinct, hyaline. 
Habitat . — South Atlantic, H.M.S. Challenger (Castracane). 
Yar. striatula , nov\ C. atlanticus , var., Cstr., ibid., p. 158, pi. iii. 
fig. 7. — Diam. *07 1 5 mm. Markings round, granular, and irregular 
from the centre to about J of radius beyond this polygonal in 
evident fasciculi ; those composing each fasciculus parallel to that 
at its centre, subequal, 6 in ‘01 mm. Border about of radius 
broad, striae 8 to 10 in *01 mm. 
Habitat. — (?) (Castracane). 
C. nitidus. Greg., Trans. Roy. Soc. Edin., 1857, p. 499, pi. x. 
fig. 45. — Diam. ’03 to *075 mm. Surface almost flat. Central 
space absent. Markings small, rounded, subpearly, with hyaline 
interspaces, largest towards the centre, decreasing slightly to the 
border, irregular, sometimes in inconspicuous radial subfasciculate 
rows around the border. Border striae, 6 in *01 mm., distinct. — 
Balfs in Pritch. Inf., p. 831, pi. viii. fig. 18 ; Sch., Jahresb. d. Kom. 
z. Untersuch. d. deutsch. Meer , Kiel, 1874, p. 94, pi. iii. fig. 32; 
