1888 - 89 .] Mr John Rattray on the Genus Coscinodiscus. 593 
C. subsalsus. Juh.-Dannf., Bill. Sv. Vet.- Ah Handl. Stockh., 
1882, p. 47, pi. iii. fig. 33. — Diam. -035 to ‘045 mm. Surface 
slightly convex. Central space and rosette absent. Markings 
pearly, 12 in *01 mm., somewhat less dense at the centre than 
about the semiradius, near the border more minute, and forming a 
somewhat broad distinct zone of irregular width; rows radial or 
subparallel, obscurely fasciculate; secondary irregular concentric 
hands visible. 
Habitat. — Subfossil at Sunda, in Blido Upland ; Upland, Lido, 
Uorrtelje, Karlshamn (Juhlin-Dannfelt). 
C. Trinit atis , Rattray. Oestodiscus ( pulchellus , var.) Trinitatis , 
Grun.; Yan Heurek, Syn. Diat. Belg., pi. cxxvi. fig. 4. — Diam. 
*04 mm. Surface with the central portion extending to about £ of 
radius, its outer edge subcrenulate, distinct. Central space circular, 
about of diam. broad. Markings rounded, granular, decreasing 
gradually towards the border, least crowded near the central space; 
towards the centre 6, towards the border 12, in '01 mm.; apiculi 
distinct, large at somewhat unequal wide intervals, inserted near 
the outer edge of the central portion. — Oestodiscus pulchellus , 
Habirsh., Cat. Diat., ed. 2, 1885, § Oestodiscus. 
Habitat. — Naparima deposit (Yan Heurek, Grove !). 
O. disciger. Ehrb., Mon. Ber. Ah, 1843, p. 271. — Diam. -056 
mm. Central space distinctly defined, large, irregularly circular, 
not smooth. Markings minute, equal, in contact, hardly conspic- 
uous, 15 in -01 mm. — Kiitz., Sj). Alg., p. 123. 
Kiitzing, followed by Ralfs, contrasts this species with O. per- 
foratus, hence the markings were probably also in radial, straight, 
or almost straight rows. 
Habitat. — Yirginian deposit (Kiitzing); Ems, near Wiener; marine 
mud, from Uorderney; 2J fathoms, Crildmar; marshy ground, 
Wohrden (Ehrenberg). 
O. cervinus. Ralfs in Pritch. Inf., p. 831. — Diam. *135 to 
•2125 mm. Surface convex towards the centre. Colour fawn. 
Central space and rosette absent. Markings minute ; rows straight. 
— Hyalodiscus cervinus. Bright w., Quart. Jour. Micr. Sci., 1860, 
p. 95, pi. v. fig. 9. 
yol. xvi. 29/10/89 2 p 
