502 
Proceedings of Royal Society of Edinburgh. [sess. 
obvious, placed at the ang'les of the octagon. Border with its inner 
edge distinct, about of radius broad, striae evident, 4 to 5 in 
*01 mm. 
Habitat . — Cambridge deposit, Barbados (Cleve, Greville !) ; 
Oamaru deposit (Grove !). 
C. Rothii. Grun., Denk. Wien. Ah, 1884, p. 29, pi. iii. (C), figs. 
20a, 20 b, 22. — Diam. -07 to -175 mm. Surface with faint undula- 
tions. Central space absent. Markings polygonal, 6 to 8 in *01 mm., 
decreasing slightly towards the border, irregular on a small central 
area, elsewhere in straight fasciculate rows, subparallel to that at 
centre of each fasciculus- or subradial; apiculi small, placed at the 
middle of the outer ends of each fasciculus. Border distinct, with 
uniform strise, 14 in *01 mm. — Cleve and Moll., Diat ., No. 57 ; 
C. Rothii forma minor , Grun. : Van Heurck, Typ. Syn. Diat. Belg ., 
No. 533; C. symmetricus, Kitton and Weissflog (not Grev.), Sell., 
Atl., pi. lvii. figs. 25, 26, 27 ; Heterostepliania Rothii (a) octonaria , 
Ehrb., Mikrog ., pi. xxxv. a, 13 b. fig. 4 ; II. Rothii (/?) denar ia, Ehrb., 
ibid., pi. xxv. a, 13b. fig. 5; II. Rothii, Balfs in Pritch. Inf., p. 833., 
pi. v. fig. 33. 
Ehrenberg established but did not define Heterostephania, of 
which the only known species was H. Rothii ; his forms octonaria 
and denaria founded only on the number of fasciculi may be 
abandoned. C. Rothii is sometimes distinguished from C. subtilis 
by the smaller number of rows in each fasciculus, and especially 
by the position of the apiculi. C. Rothii forma minor , Grun., 
differs only in its small size, *025 to *0375 mm. in diam. 
Habitat . — Elbe Tertiary mud (Ehrenberg).* Ceylon (Macrae !);f 
Caspian Sea (Grunow) ; locality 1 ? (Bae!). Porto Seguro (Hardman !); 
Manilla (Firth !) ; Amboina shell scrapings (Kinker !) ; surface, 
Arafura Sea, H.M.S. Challenger (Rae !) ; Oamaru deposit (Mar- 
shall!) Chalky Mt., Barbados (Firth !) Para River, S. America 
(Hardman !);§ India (Macrae!) ;|| Antwerp (Van Heurck!); Oamaru 
deposit (Grove !) ; Whampoa (Grove !) ; rice fields, Georgia (Gre- 
ville!); IF Cambridge deposit, Barbadoes (Johnson !); || Rio Janeiro 
* This diluvial formation was discovered by Roth. 
+ In the collection of Dr Greville. + In the collection of Dr F. W. Griffin. 
§ In the collection of Julien Deby. || In the collection of Dr Greville. 
IT Rare, amongst abundance of C. subtilis. 
