1888 - 89 .] . Mr John Rattray on the Genus Coscinodiscus. 551 
This var. approaches var. princeps in the character of the central 
space, but is distinguished by its larger markings. 
Habitat. — Santa Monica deposit (Grunow). 
Var. macrantha. Grun., ibid., 1884, p. 78. — Diana. *45 mm. 
Central space still larger, ’026 mm. broad, round, smooth, or 
punctate. Markings subequal, 4 in ‘01 mm. 
Habitat. — Found on a mass of diatoms floating on the Elbe by 
Moller (fide, Grunow). 
Var. princeps. Grun., ibid., 1884, p. 78.- — Diam. '5 mm. Central 
space subcircular, *025 mm. broad. Markings decreasing outwards 
to about semiradius thence increasing slightly towards the border, 
5 to 6 in ‘01 mm. — Van Heurck, Syn. Diat. Belg., pi. cxxviii. 
figs. 1-3. 
Separated from the preceding by its smaller markings. 
Habitat. — With var. macrantha (Grunow, Van Heurck). 
Var. pabellanica. Grun., ibid., 1884, p. 79. — Diam. T45 to 
*16 mm. Central space "0065 mm. broad, the surrounding band of 
markings evident, but less prominent than in vars. princeps and 
macrantha. Markings 5 in *01 mm., somewhat smaller at the 
border, faintly punctate. — C. asteromphatus, var. pabellana, Grun. 
in Van Heurck, Syn. Diat. Belg., pi. cxxviii. fig. 5. 
Habitat.— Pabellan de Pico guano (Grunow) ; Peruvian guano 
(Hardman !).* 
Var. hybrida. Grun., ibid., 1881, p. 79, pi. iii. (C) fig. 9. — Diam. 
•175 to '35 mm. Surface convex toward the border. Central rosette 
evident, rarely indistinct. Markings 4 in *01 mm., somewhat smaller 
close to the rosette than about the semiradius thence gradually 
decreasing towards the border to G in *01 mm., sometimes indis- 
tinctly punctate, a circlet of minute apiculi sometimes present at 
the border. — Pant., Fossil. Bacil. TJng ., p. 71 ; Sch., Atl., pi. cxiii. 
fig. 22 ; C. centralis, Sch., Atl., pi. Ixiii. fig. 1. 
Habitat. — Felso-, Esztergaly, Kekko and Szent Peter deposits 
(Pantocsek) Hvidingsoe, N. Sea, Cuxhaven, Marahon mouth, Davis 
In the collection of Julien Debv. 
