1888-89.] Mr John Rattray on the Genus Coscinodiscus. 481 
Distinguished from C. circumdatus by the greater irregularity of 
the rows about the centre and the simple border. 
Habitat. — San Francisco, Cal. (Schmidt). 
C. Kiitzingii. Sch., Atl, pi. lvii. figs. 17, 18. — Diam. *0635 mm. 
Central space absent. Markings polygonal, about 6 in *01 mm., 
subequal or decreasing slightly towards the border ; rows distinctly 
fasciculate beyond the semiradius ; those in each fasciculus parallel 
to one another, secondary oblique decussating rows evident, and 
curved towards the border. Border sharply defined, bearing 
crowded oblique decussating rows of areolae. — Grun. Denk. Wien. 
Ak., 1884, p. 84; C. marginatus, Sch., Jahresb. d. Kom. z. Unter- 
such. d. deutsch. Meer , Kiel. 1874, p. 94, pi. iii. fig. 35. 
Distinguished from C. suspedus by the more evident fasciculi 
and border, and from C. subtilis in the absence of apiculi. The 
relationship to C. excentricus referred to by Grunow is more 
remote. 
Habitat . — Cuxhaven, Firth of Tay (Schmidt) ; Arctic and 
Antarctic (Grunow). 
Yar. glacialis. Gran., Denk. Wien. Ak ., 1884, p. 84, pi. iv. (D), 
fig. 18. — Diam. 045 mm. Markings 10 in 01 mm., decreasing 
slightly towards the border ; rows less distinctly fasciculate, a circlet 
of minute apiculi inserted at the border. Border striae radial, 
distinct, 8 to 10 in *01 mm. 
Habitat. — Franz Josef’s Land ; Cape Wankarema, North Siberia ; 
Kerguelen (Grunow). 
C. subglobosus. Cleve and Grun., Denk. Wien. Ak ., 1884, p. 84, 
pi. iv. (D), figs. 19, 20. — Diam. 025 to 04 mm. Surface some- 
what convex. Central space absent. Markings polygonal, decreasing 
slightly towards the border, 8 in 01 mm.; rows radial, on outermost 
portion of valve parallel and subfasciculate ; secondary oblique rows 
curved outwards, most evident towards the border. — Sch., Atl., pi. 
lviii. fig. 44 (no name); Cleve and Moller, Diat ., Nos. 114, 172, 
302, 319. 
Distinguished from C. Kiitzingii by the more irregular markings 
on the central portion. 
VOL. XVI. 25/10/89 2 H 
