1888-89.] Mr John Rattray on the Genus Coscinodiscus. 527 
C. patina. Ehrb., Abh. Ber. Ak., 1839, p. 147, pi. iii. figs. 3 a-e. 
—Diam. -035 to -1125 mm. Surface flat. Central space and 
rosette absent. Markings angular, subequal, somewhat smaller 
near the border ; rows concentric, obvious, radial rows undifferen- 
tiated. Border narrow, hyaline. — Ehrb., Mikrog ., pi. xx. 1. fig. 31 ; 
Ralfs in Pritcli. Inf., p. 830; Janiscb, Gazelle Exped., taf. v. fig. 1; 
C. patina, Ehrb., pro parte , Abh. Ber. Ak, 1838, p. 129, pi. iv. 
figs. 10-12 d. (Excl. C. patina , Bail., Amer. Journ. Sci., 1842, 
vol. xlii. p. 96, pi. ii. fig. 13.) 
The Simbrisk valve, figured by Weisse (Bull. Acad. Imp. St 
Petersb., 1855, p. 276, pi. i. fig. 6) has round free markings, with a 
more prominent circlet at the border, and is probably distinct. 
Ehrenberg at first embraced in C. patina bis G. radiatus (conf. 
Abh. Ber. Ak., 1839, p. 148). The specimen figured by Janiscb 
(Gazelle Exped.) shows the concentric arrangement of the mark- 
ings most clearly towards the border ; the areolae are at intervals 
irregular. 
Habitat. — Zante, Caltanisetta, Oran and Grecian deposits, Cux- 
baven (Ehrenberg). 
G. argus. Ehrb., Abh. Ber. Ak., 1838, p. 129. — Diam. from 
*0675 to T75 mm. Central space absent, a rosette sometimes 
present. Markings polygonal, increasing gradually outwards; at the 
centre 4, near the border 2 to 3, on a narrow zone adjacent to the 
border 4 or 5, in *01 mm. ; secondary oblique rows indistinct or 
undifferentiated. — Ehrb. ibid., 1839, p. 145, Mon. Ber. Ak., 1844, 
p. 79; Mikrog., pi. xxi. fig. 2 (excl. pi. xxii. fig. 5, 8); Grun., 
Denk. Wien. Ak., 1884, p. 72; G. irradiatus, Harting, Verh. 
Kon. Ak. Wetensch , Amsterdam, 1864, No. ii. p. 8, pi. i. fig. 1); 
C. radiatus, Ehrb., Mikrog., pi. xxi. fig. 1 ; C. Woodwardii, Sch., 
(not Eul.) Atl., pi. lxi. fig. 2; G. heteroporus, Grun., in Sch., Atl., 
pi. lxi. fig. 2. 
Ehrenberg regarded this as probably a var. of G. radiatus ; 
Bright well and Grunow more correctly accept it as a distinct 
species. Harting points out the affinity of his G. irradiatus to 
G. radiatus, Ehrb., but its markings increase towards the border 
as in G. argus, to which it seems rather to belong. Some specimens 
belonging to this species were labelled by O’Meara G. sinensis. 
