480 CLEVE, DIATOMS. 



var.? Nystromii Grun. (CI. & M. Diat. No 172) Greenl. 

 (Davis Strait), not known to me. 



SecHo: Spathulatm. 



N. angularis W. Sm. (^^an Heurck Syn. PI. LXII, fig. 11— 

 14) Greenl., Finm., Kara (Matotschkin), Cape Desehnew (East 

 Cape). 



var. borealis Grun. (A. Diat. pag. 89, PL V, fig. 99) Finm., Kara. 



var. Jcariana Grun. (1. c. p. 89, fig. 100) Kara. 



N. spathulata Breb. (Van Heurck Syn. Pi. LXII, fig. 7—8) 

 Greenl. (Davis Strait), Finm. 



var. hyalina Greg. (Van Heurck Syn. ]. c. f. 9) Kara. 



Sectio: Sigmoidew. 



N. macilenta Greg. — In the Diat. of the A. S. I have 

 indicated this species as occurring near Spitsbergen, but, not 

 having met this species again, I think it may be a mistake. 



N. BreUssonii var. borealis Grun. (CI. & M. Diat. 316 — 318) 

 Strise 14 — 16 in 0,oi mm. Cape Wankarema. 



Sectio: Sigmata. 



N. Sigma Sm. (Amphipleura rigida CI. D. of the A. Sea pag. 

 26. Amphipleura sigmoidea W. Sm.) Greenl., Finm., Spitsb. 



N. (Sigma var.?) scabra CI. — Valve large, in length 0,n — 

 0,2 mm. breadth 0,oi mm., slightly sigmoid, or almost straight. 

 Keel eccentric. Puncta about 4 in 0,oi mm. Striae not seen, 

 but the surface of the valve is covered by scattered puncta, 

 which give it a shagreen-like appearance. — PL 38, fig. 73 

 a. b. — Cape Wankarema. 



N. Icevissima Grun. Mpt. — Greenl. (Discovery Bay), F. J. L., 

 Cape Wankarema. 



Sectio: Obtuse. 



N. (obtusa var.??) hryopMla CI. Linear, slightly sigmoid 

 toward the ends. Puncta 8, absent in the middle, where there 

 is a small central nodule. Strise 20 in 0,oi mm., composed 

 of puncta. Length 0,i4 mm. Breadth 0,oo6 mm. — PL 38, fig. 

 74. — Cape Wankarema. 



Sectio: Linear es. 



N. gelida CI. & Grun. Straight with cuneate ends. Keel 

 tolerably eccentric. Carinal puncta 6—8 in 0,oi mm., distant 

 in the middle, where there is a distinct central nodule. Strise 

 composed of somewhat elongate puncta, which form irregularly 

 wavy lines, 20 — 24 in 0,oi mm. Length 0,u mm. Breadth 

 0,012 mm. — PL 38, fig. 70. — Cape Wankarema. 



N. (recta var. ?) polaris Grun. — Valve tolerably eccentric, 

 linear with obtuse ends. Carinal puncta 7 in 0,oi mm., distant 



