576 Proceedings of Royal Society of Edinburgh. [sess. 
border at intervals of "01 to *0125 mm., and expanding slightly 
outwards. Border sharply defined, hyaline. — Coscinodiscus nor- 
manianus , Grev., ibid ., Explan. pi. viii. fig. 11. 
The name normanianus is undesirable, there being already a C. 
Normanii , which is distinct. 
Habitat. — Barbados deposit (Norman, Grove !). 
C. splendidulus , Battray. Cosmiodiscus normanianus , Grove and 
Sturt (non Grev.), Jour. Quek. Micr. Cl ., 1887, p. 65, pi. vi. fig. 
21. — Diam. ’055 to *075 mm. Surface almost flat. Central space 
circular, about of diam. broad. Markings small, round, granular, 
with wide unequal interspaces, somewhat more crowded towards 
the border; rows straight, but inconspicuous, at regular intervals 
of about -01 mm. narrow hyaline radial lines, most distinct towards 
the border, the outer ends of the intervening compartments convex 
outwards ; a distinct but small apiculus at the outer ends of the 
hyaline lines. Border distinct, about of radius broad, hyaline. 
Habitat . — Oamaru deposit (Grove !). 
C. perikomjososf Battray. Cosmiodiscus elegans y Grev., Trans. 
Micr. Soc. Lond. y 1866, p. 79, pi. viii. fig. 13. — Diam. *0875 to -095 
mm. Surface slightly convex towards the border. Central space cir- 
cular, jL to of diam. broad, faint. Markings obscure, punctiform, 
most distinct on the inner half of the valve, in faint radial rows ; 
towards the border more crowded, 20 to 25 in -01 mm., forming 
punctiform, evident, straight, radial striae, 14 in -01 mm., at sub- 
regular intervals of *006 to *0075 mm. distinct, straight, hyaline 
radial lines extending outwards from the central space, and most 
prominent towards their outer ends. Border narrow, hyaline. 
—(PL III. fig. 12.) 
Habitat. — San Pedro (Grove !) ; Monterey (Hardman, Greville) ; 
Santa Monica deposit (Grove !). 
Yar. curta , nov. — Diam. ’04 to '0625 mm. Central space distinct, 
rounded or irregular, small, rarely of considerable size. Markings 
8 to 10 in '01 mm., least crowded near the centre, near border more 
minute, forming closely disposed radial striae 12 in '01 mm.; rows 
separated at equal or subequal intervals by hyaline substraight lines, 
* irepino/x^os, very elegant. The specific name elegans is preoccupied ( q . v.). 
