PLATE VII. 



Fis;-. 15. Xit.-sclii(i (ircfica Cl. 



a. Cell in side view, «=7,. Tiic Ostncs Fiord T, --'A 1900, 0—25 in. 80 <>. long-, 7 <>. broad; 7—8 keel puncta on 10 ;j.. No 

 distinct tiansversc striæ were seen. By an error in reproduction the margin appears to be a little undulated. Tlie coll 

 is. indeed, slightly broader in the middle, then evenly narrowed off to the ends, which are of even breadth. 



The same species occurs in Cl. et Møll., nr. 318, from Cape Wankarema (slide in the Riksmusæuni, iStockliolm). 



b. Cell in side view, '^'^7i. Kvænangen, =',4 1899, 300—200 m. 71 jj. long, 8 |i broad; 8 keel puncta on lo ;).. The division 

 lines of the connecting zone are here — as in the following ligui'cs — too plainly visible. They are in reality only seen 

 with difKculty. 



c. Cell in side view, ■'■'7i, from Brettesnes (Lofoten) 74 1899. The keel puncta of only one valve are illustrated. Gl 'i. long, 



9 n broad; about 10 keel puncta on 10 ji. Transverse striæ were not plainly visible. The connecting zone finely striate. 



d. Cell in side view; "^7,; a very large specimen. Folstad, ^4 1899. 108 \i long, 12 \i broad; 9 and 10 keel puncta on 



10 <L. On the left valve only the keel puncta of the median part are shown. The keel seemed to be very excentric. 

 Transverse striæ indistinct. 



e. A single valve, ^=7,. Lille Molla, V4 1899, m. 90 [>. long, 5 [). broad; 7'h keel puncta on 10 <>.. Stria' indistinct. 



f. Valve in valvar view, ^=7i, from the same locality. 83 n long, -i— 4V-' l'- broad; 9 keel puncta on 10 ;).. .Striæ were 

 not seen. 



The specimens e-f are very similar to X. lærisnima Geux., but seem to belong to the same species as a— d. 

 10. Tfopidonels imruUela Joeg. n. sp., •'■'7,. a, b from 71" 48' n., -49" 38' e., .S/S Heimdal, ■"/., 1900. 



a. Cell in side view. 7o \>. long, 18 \i. broad: about 10 striæ on 10 ;i.. 



b. Valve (in valvar view). 67 \>. x 12 ij., 15 striæ on lo \l. Boatshaped, with a nai-row, high, median part. 



c. Twin cell, in side view. The Ostnes Fiord I, ^Vs 1900, 0—25 m. The striæ are only shown on a portion of the valve, 

 and ought to be somewhat closer. 



17. Pkurosigma tenerum Jørg. ^ P. Stuxher(jli Cl. 



a— c. 3 cells with protoplasmatic parts, from samples consei'ved in formaline; -'"7i. Rombaken (the Ofoten l-'iord) ",:. I89!i. 

 0—40 m. Lengths 290 i^, 340, 275; breadths 38 \i, 38, 40. The inner parts are badly reproduced. In the figure a the 

 chromatophores should not be united above. In b the chromatophore of the right side has paitly disappeared. The median 

 longitudinal line of the figure c is the raphe. 



d. Cell in valvar view, ^"7,. The Salten Fiord II, 74 1900, 0— 50 m. The specimen has been ignited on cover-glass ami 

 has become somewhat deformed. 



18. P. (lelieaMum W. Sm., ="7,. Folstad, */i 1899, 0—3 m. 222 \>. x 26 |i. The 3 crossing lines to the right show the 

 direction of the striæ. Veiy similar to P. delicatulum var. lariana Giu-N., but differs in having the transverse striæ rathei- 

 less close than the oblique ones. 



., 19. P. temimimiim W. Sm. var. hi/perhorea Geun. The contour of the valve is badly I'eproduced. 



a. Lille Molla, 'A 1899, m.; "'7i. 77 'j. x 5 |x; transverse striæ 20—22 on lo jj., longitudinal ones 24. 



b. Folstad, 74 1899, 0—3 m.; «"7,. 



20. P. tmnirostre Gecx., S""/,. The Folden Fiord I, 74 1900, 0—100 m. The specimen Ues somewhat obliquely. Only one 

 half of the valve is given in the figure. In this position, close oblique striæ were seen, 25—30 on 10 |j.. At the ends, in- 

 distinct lontritudinal lines, which wei'e somewhat wavy, were seen. 



