rEaA-EXPEDITIONENS VETESSKAPHaA AMBETEN. 487 



The awns are transversely striate, striae being 15 in 0,oi mm. 



C. atlanticus 01. (1. c. PI. II, fig. 8 a) Greenl. (Davis Strait, 

 Tindingen), Northern Atlantic. 



var. attenuata Grun. (A. Diat. pag. 121. CI. D. of A. Sea 

 1. c. fig. 8 b). 



var. tumescens Grun. (Van Heurck Syn. PI. LXXXI, fig. 6). 



G.pelagicus 01. (D. of the A. Sea pag. 11, PI. I, fig. 4) Northern 

 Atlantic Ocean. 



In some specimens the awns have distant papillse. 



C. connivens Grun. (in 01. & M. Diat. No 118) Northern 

 Atlantic. 



a Wighami Btw. (M. J. IV, pag. 108, PI. VII, fig. 19—36) 

 Greenland (Davis Strait), Northern Atlantic- Ocean. 



forma minuta Grun. (A. Diat. pag. 120, PI. VII, fig. 134) Kara. 



C. borealis Bail. (Smith. Contr. VII, pag. 8, fig. 22—23) 

 Greenl. (Tindingen), Northern Atlantic, Kara, Cape Wankarema. 



var. BrightweUu 01. (D. of A. S. pag. 12, PL II, fig. 7) Davis 

 Strait, Northern Atlantic Ocean. 



a peruvianus Btw. (M. J. IV, pag. 107, PI. VII, fig. 16— 

 18) Davis Strait, Northern Atlantic. 



C. Lorendamis Grun. var. parvula Grun. (A. D. pag. 120, 

 PI. VII, fig. 138) Kara. ^ 



C. furcellatus Bail? (Grun. A. Diat, pag. 120,. PI. VII, fig. 

 136) Northern Atlantic Ocean. 



This peculiar form is the auxospore of a species nearly 

 related to G. sociaUs Laud. (T. M. S. XII, pag. 77, PI. VIII, 



fig- 1)- 



var. mamillaris Grun. (A. Diat. pag. 120, PI. VII, fig. 37) Kara. 



G. karianus Grun. (A. 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 Chsetoceros. 



Didadia Mitra Bail. (Sillim. Am. Journ. 1856, pag. 4, PL 

 I, fig. 6. D. grotnlandiea 01. D. of the A. S. pag. 12, PL II, fig. 

 10) Greenl., Kara (Matotschkin Schar), Cape Wankarema. 



21. Melosireae. 



Asteromphalus Hoolceri Grev. var. (A, Brookei 01. D. of the 

 A. S. pag. 10, PL IV, fig. 19) Greenl. (Davis Strait). 



Actinoptychus undulatiis Ehb. (A. Schm. Atl. PL I, fig. 4) 

 Oape Wankarema. 



