466 Proceedings of Royal Society of Edinburgh. [sess. 
(Schmidt); Vera Cruz, among Sertularia ; Elbe, above Cuxhaven 
(Rabenhorst and Schwarz!); Carral, near Valdiva (Rabenhorst and 
Gerstenberger !). 
C. circumdatus. Sch., Atl., pi. lix. fig. 3. — Diam. *07 mm. 
Markings polygonal, decreasing slightly from the centre towards the 
border; towards the centre 4, towards the border 8 in ‘01 mm.; 
radial rows 6 to 8, inconspicuous ; the oblique decussating rows 
almost straight. Border about of radius broad, inner |- hyaline 
between distant subregular narrow radial lines, outer J with evident 
striae, 8 to 10 in - 01 mm. — Van Heurck, Syn. Diat. Belg ., pi. cxxxi. 
fig. 4. 
Distinguished by the border. 
Habitat. — Yokohama (Griindler). 
C. sol. Wallich, Trans. Micr. Soc. Lond., 1860, p. 38, pi. ii. 
figs. 1, 2. — Diam. *0625 to *15 mm. Markings on the central 
highly silicified portion distinct, decreasing somewhat rapidly from 
the centre outwards ; towards the centre 4J to 5, towards the border 
6 to 7 in ’01 mm., the central areola surrounded by 6 or 7 similar 
areolae, whence a corresponding number of inconspicuous radial 
rows pass to the border; the oblique decussating rows distinctly 
concave outwards, non-apiculafce, the outer portion from J to J of 
radius broad, scarcely siliceous, with numerous but distinct sub- 
uniform costae. — Ralfs, in Pritch. Inf, 1, p. 830 ; Sch., Atl., pi. lviii. 
figs. 41, 42, 45; Grun., Denk. Wien. Ak., 1884, p. 84; Cleve and 
Moll., Diat., Nos. 145, 146. Cestodiscus sol, Wallich, in Van 
Heurck, Syn. Diat. Belg., pi. cxxix. fig. 6. 
Habitat. — From Salpa spinosa, South Sea (Weissflog!) ; surface, 
Gulf of Guinea (Rattray !) ; Cambridge deposit, Barbados (Greville !); 
Java Sea (Kitton, Cleve and M oiler !). 
§ IV. Lineati, Pant., Fossil. Bacil. Ung., p. 72. 
Central space absent, rarely small; a rosette rare. Markings 
angular in contact ; radial rows obscure ; oblique, decussating rows 
straight. Apiculi sometimes present, a larger apiculus inserted at a 
greater distance from border somewhat rare. 
C . subconcavus , Grun. Sch., Atl., p. lix. figs. 12. 13. — Diam 
