488 CLEVE, DIATOMS. 



AcHnocyclus aliemis Grun, (CI. & Moll. Diat. No 319) Cape 

 Wankarema. — Unknown to me. 



Coscinodlscus Ocidus Iridls Elib. — Greenl., Spitsb., Cape 

 Wankarema. 



var. horealis Bail. — Cape Wankarema. 



C. radiatus Ehb. — Greenl. (Davis Strait), Beeren Eiland,. 

 Finm., Spitsb. 



C. concinnus Roper (M. J. A^I, pag. 20, PL III, iig. 12) Spitsb., 

 Cape Wankarema. 



C. centralis Ehb. (Greg. Diat. of CI. pag. 501, PI. XI, fig. 

 49) Spitsb., Greenl., Tindingen (A. Schm. Atl. PJ. LXIII, fig. 1). 



var. micraster Grun. (CI.- and Moll. Diat. No 172) Davis 

 Strait. 



C. suUiUs 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. suhglobosus CI. and Grun. (CI. and Moll. Diat. No 172, 

 A. Schm. Atl. PL LVIII, fig. 44) Greenl. (Davis Strait), Cape 

 Wankarema. 



C. (Odontodiscus) curvatulus Grun. (A. Schm. Atl. PL LVII, 

 fig. 33) Greenl. (Davis Strait), F. .1. L., Cape Wankarema. 



C. Normanni CI. D. of A. S. pag. 6 is only a variety of 

 C. curvatulus. 



var. Jcariana Grun. (A. Diat. pag. 113, PL VII, fig. 129) 

 Finm., Kara. 



var. frigida Grun. — F. J. L. 



C. concaviis Greg. (D. of CI. pag. 500, PL X fig. 47) Kara. 



C. (Odontodiscus) polyacantlms Grun. (A. D. pag. 112, PL 

 VII, fig. 127) Greenl. (Tindingen) Kara (.Jalmal). 



C. (Odontodiscus) hycdlnus Grun. (A. D. pag. 113, PL VII, 

 fig. 128) Greenl. (Tindingen) F. J. L., Kara, Cape Wankarema. 



C. (Odontodiscus) hiocid(dus Grun. Mpt. — Greenl. (Tindin- 

 gen), F. J. L., Cape Wankarema. 



C. (Odontodiscus) pellucidus Grun. (in CI. & Moll. Diat. No 

 172) Davis Strait, Cape Wankarema. 



Valve very thin and transparent, 0,o65 — 0,08 mm. i diame- 

 ter, covered with small puncta, arranged in repeatedly branch- 

 ing lines (10 in the middle and 20 in the margin on 0,oi 



