VEG A-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 487 
The awns are transversely striate, strie being 15 in 0,01 mm. 
C. atlanticus Cl. (1. ce. P1. II, fig. 8 a) Greenl. (Davis Strait, 
Tindingen), Northern Atlantic. 
var. attenuata Grun. (A. Diat. pag. 121. CI. D. of A. Sea 
IFE SH) 
var. tumescens Grun. (Van Heurck Syn. Pl. LXXXI, fig. 6). 
C. pelagicus C1. (D. of the A. Sea pag. 11, Pl. I, fig. 4) Northern 
Atlantic Ocean. 
In some specimens the awns have distant papillze. 
C. connivens Grun. (in Cl. & M. Diat. No 118) Northern 
Atlantic. 
C. Wighami Btw. (M. J.: IV, pag. 108, Pl. VII, fig. 19—36) 
Greenland (Davis Strait), Northern Atlantic Ocean. 
forma mimuta Grun. (A. Diat. pag. 120, P1. VII, fig. 134) Kara. 
C. borealis Bail. (Smith. Contr. VII, pag. 8, fig. 22—23) 
Greenl. (Tindingen), Northern Atlantic, Kara, Cape Wankarema. 
var. Brightwellii Cl. (D. of A. S. pag. 12, Pl. II, fig. 7) Davis 
Strait, Northern Atlantic Ocean. 
C. peruvianus Btw. (M. J. IV, pag. 107, P1. VII, fig. 16— 
18) Davis Strait, Northern Atlantic. 
C. Lorenzianus Grun. var. parvula Grun. (A. D. pag. 120, 
Pl. VII, fig. 138) Kara: 
C. furcellatus Bail? (Grun. A. Diat. pag. 120, Pl. VII, fig. 
136) Northern Atlantic Ocean. 
This peculiar form is the auxospore of a species nearly 
related to -C. :socialis: Laud. (T. M. S. XII, pag. 77, P1. VIII, 
FSL 
var. mamillaris Grun. (A. Diat. pag. 120, P1. VII, fig. 37) Kara. 
C. karianus Grun. (ÅA. Diat. pag. 120, Pl. VII, fig. 135) Kara. 
Syndendrium Diadema Ehb. (Btw. M. J. IV, Pl. VIII, fig. 
49—52) Northern Atlantic, Cape Wankarema. 
Evidently the auxospores of several species of Cheetoceros. 
Dicladia Mitra Bail. (Sillim. Am. Journ. 1856, pag. 4, Pl. 
I, fig. 6. D. grenlandica Cl. D. of the A: S. pag. 12, P1. II, fig. 
10) Greenl., Kara (Matotschkin Schar), Cape Wankarema. 
21. Melosire2. 
Asteromphalus Hookeri Grev. var. (A. Brookei Cl. D. of the 
A. 5. pag. 10, Pl. IV, fig. 19) Greenl. (Davis Strait). 
Actinoptychus undulatus Ehb. (A. Schm. "Atl. Pl. I, fig. 4) 
Cape Wankarema. 
