214 Ernst Østrup. 



Loc. Off Cape Amélie (Algæ), Danmarks Havn (Algæ, 2 sampl.), Koldewey 

 Isl. (Algæ, 4 sampl.). 



Arct. Distr. Greenl., East Arct. S. 



Cocconeis costata \ar. pacifica Grun., V. H. Syn., Tab. XXX, 

 figs. 13—14. 



Loc. Danmarks Havn (Algæ). 



Arct. Distr. Greenl. 



Cocconeis ornata Greg? cf. Greg. D. Clyde, 19, Tab. I, fig. 24. 

 Tab. nost. XIII, Fig. 14. 



Long 32 /4. Lat. 16//, costis 8 in 10«, utrisqve in valvis. 



Valva elliptica, area apicali distincta. Costis leniter radiantibus, 

 in Hypotheca vitta submarginali nuda interruptis. 



Loc. Koldewey Isl. (Algæ). 



This species may be Gregorys Cocc. ornata, although Gregory (1. c.) des- 

 cribes the apical area as a "long lanceolate blank space" and figures the striæ 

 as strongly radiate towards the apices. Cleve (Syn. И, 171) mentions Cocc. 

 ornata as a form which possibly may be a variety of Cocc. Scntellum Ehr., 

 but in this matter I cannot agree with him. Cocconeis ornata occurs in 

 "Lamlash Bay" and in "Loch Fine." 



Cocconeis sp. Tab. nost. XIII, fig. 17. 



Long. 31,«. Lat. 20//. Str. 11 in 10/^, ad marginem numeratis, 

 delicatissime punctatis. 



Hypotheca: Valva elliptica. Raphe area angusta distincta, media 

 in parte valvæ in aream parvulam centralem acuminatam dilatata, 

 cincta. Striis ubiqve in marginem perpendicularibus. Nodulis ter- 

 minalibus paululum ab apicibus remotis. Hypothecam modo ob- 

 servavi. 



Loc. Koldewey Isl. (Algæ). 



As I have only seen the hypotheca I have not given this form as a new 

 species. 



Achnanthes Borg., 1822, 

 Subg. Heteroneis CI., 1895, pro. gen. 

 Achnanthes hyperborea Grun., CI. Syn., II, 183 ; Grun., Fz. Js. Ld., 

 Tab. I, figs. 4—5. Tab nost. XIII, fig. 15. 

 Loc. Off Cape Amelie (Algæ). 

 Arct. Distr. Franz-Josef Land. 



Subg. Microneis CI., 1895 pro. gen. 

 Achanthes debilissima sp. nova? Tab. nost. XIII, fig. 24, cf. 

 Grun., Fz.Js. Ld., 52, Tab. I, fig. 42 (Navicula debiliss. Grun.). 

 Long. 6,3— 7,«. Lat. 2,7/«. 

 Valva elliptica. Striis perdifficiliter perspiciendis. 



Loc. Koldewey Isl. (2 sampl). 



This hyaline and exceedingly small species may be identical with Na- 

 vicula debilissima Grun. Grunow's figure shows both the terminal nodules 

 and a central nodule and the latter he describes in the text (1. c.) as "minu- 



