1888-89.] Mr John Rattray on the Genus Coscinodiscus. 553 
dots minute ; towards the centre 3, towards the border 5, and at the 
border 8, in *01 mm.; secondary oblique decussating rows evident. 
Habitat. — Springfield deposit, Barbados (Schmidt, Grunow, 
Hardman !). 
Var. bengalensis. Grim., Denk. Wien. Ah., 1884, p. 73. — Diam. 
•08 to T‘4 mm. Markings smaller ; towards the centre 4, at the 
border 10, in *01 mm. 
Habitat. — Brackish water, coast of Bengal (Grunow). 
Yar. diminuta. Grun., ibid., 1884, p. 73. — Markings still more 
minute ; towards the centre 6 in *01 mm., less distinctly punctate. 
This var. approaches G. radiosus, Grun. 
Habitat. — Brackish water, coast of Bengal (Grunow). 
C. fimbriatus. Ehrb., Mon. Ber. Ah., 1844, p. 78. — Diam. - 1 
to -1125 mm. Central space and rosette absent. Markings poly- 
gonal ; towards the centre 4, decreasing gradually outwards to 6 or 7, 
in *01 mm.; radial rows most evident towards the border. — Ehrb., 
Mihrog., pi. xxii. fig. 2 ; Ralfs in Pritch. Inf., p. 829 ; Grun., 
Denh. Wien. Ah., 1884, p. 74. C. radiolatus, Ehrb., Sch. Ati, 
pi. lx. fig. 11. 
Distinguished from C. radiosus, Grun., by its larger markings, 
which decrease less rapidly outwards in Grunow’s species. 
Habitat. — Caltanisetta (Ehrenberg) ; Sicilian marls (Grunow) ; 
Los Angelos deposit, Cal. (O’Meara !). 
Var. subradiata, nov, C. fimbriatus, var., Yan Heurck, Syn. Diat. 
Belg., p. cxxxi. fig. 2. — Diam. -063 mm. Markings 7, increasing 
gradually outwards to 6, in ’01 mm., about f of radius from the 
centre, again diminishing more rapidly to the border. 
Grunow, followed by Pantocsek, have united this to the species. 
The affinities to C. radiatus are striking. 
Habitat. — Oran deposit (Yan Heurck). 
Yar. californica. Grun., ibid., 1884, p. 74. — Diam. ’07 to - 09 
mm. Centre, often with small irregular puncta, one frequently 
larger than the others, and like the rudiment of a bristle. Markings 
