488 CLEVE, DIATOMS. 
Actinocyclus alienus Grun. (Cl. & Möll. Diat. No 319) Cape 
Wankarema. — Unknown to me. 
Coscinodiscus Oculus Iridis Ehb. — Greenl., Spitsb., Cape 
Wankarema. 
var. borealis Bail. — Cape Wankarema. 
C. radiatus Ehb. — Greenl. (Davis Strait), Beeren Eiland, 
Finm., Spitsb. 
C. concinnus Roper (M. J. VI, pag. 20, P1. III, fig. 12) Spitsb., 
Cape Wankarema. 
C. centralis Ehb. (Greg. Diat. of Cl. pag. 501, Pl. XI, fig. 
49) Spitsb., Greenl., Tindingen (A. Schm. Atl. P1. LXTII, fig. 1). 
var. micraster Grun. (Cl. and Möll. Diat. No 172) Davis 
Strait. 
C. subtilis Ehb. (A. Sch. Atl. LVII, fig. 13—14) Greenl., 
Finm., Kara (Jalmal), Cape Wankarema. 
C. excentricus Ehb. — Greenl. (Davis Strait), Spitsb., Kara, 
Cape Wankarema. 
C. lineatus Ehb. — Beeren Ed, Spitsb., Finm., Kara (Jalmal). 
C. nitidus Greg. (A. Schm.)N. Sea Diat. Pl. - III fig. 32) 
Greenl. (Davis Strait), Finm. 
C. subglobosus Cl. and Grun. (Cl. and Möll. Diat. No 172, 
A. Schm. Atl. Pl. LVIII, fig. 44) Greenl. (Davis Strait), Cape 
Wankarema. 
C. (Odontodiscus) curvatulus Grun. (A. Schm. Atl. P1. LVTI, 
fig. 33) Greenl. (Davis Strait), F. J. L., Cape Wankarema. 
C. Normanni CI. D. of A. S. pag. 6 is only a variety of 
C. curvatulus. ; 
var. skariana; Grun. (AA. Diat: I pag. 113;:P1 VIL fig: 129) 
Finm., Kara. 
var. frigida Grun. — F. J. L. 
C. concavus Greg. (D. of Cl. pag. 500, P1. X fig. 47) Kara. 
C. (Odontodiscus) polyacanthus Grun. (A. D. pag. 112, Pl. 
VII, fig. 127) Greenl.. (Tindingen) Kara (Jalmal). 
C. (Odontodiscus) hyalinus Grun. (A. D. pag. 113, Pl. VII 
fig. 128) Greenl. (Tindingen) F. J. L., Kara, Cape Wankarema. 
C. (Odontodiscus) bioculatus Grun. Mpt. — Greenl. (Tindin- 
gen), F. J. L., Cape Wankarema. 
C. (Odontodiscus) pellucidus Grun. (in Cl. & Möll. Diat. No 
172) Davis Strait, Cape Wankarema. 
Valve very thin and transparent, 0,065—0,08 mm. i diame- 
ter, covered with small puncta, arranged in repeatedly branch- 
ing lines (16 in the middle and 20 in the margin on 0,01 
