20 P. T. CLEVE, ON DIATOMS FROM TIIE ARCTIC SEA. 



The striaa are transverse and at the same time oblique. 

 Pl. valithmi Shadb. seems to be synonymous with Pl. rigidum- 



90. Pleurosigma Balticum Sm (Syn. I, pag. Q9), Pl. XXII^ 

 fig. 207). Spetsberc/en Hackluyts, Kings Bay. 



Widely distributed, I have found it in samples from 

 Honolulu, Magellhaens Strait, Manilla (Philipp.). 



91. Pleurosigma fasciola (Kg) Sm (Syn. I, fig. 67, Pl. XXI, 

 211). Spetsbergen Amsterdam Id., Hackluyts. Greenland. 



Pl. fasciola is found on the coasts of the North Sea as 

 well as in the Mediterranean Sea (Gr.). 



92. Amphiprora longa Cl. N. Sp. F. V. linear with al- 

 most parallel sides and roiinded ends S. V. lanceolate with 

 acute apices; median line straight; stria3 parallel transverse, 

 very distinct, aboiit 27 in 0,02 5 m.m. Dry valve not coloured. 



Length 0,2 2 — 0,3 m.m. 



Sp)etsbergen Hackluyts. Greenland. Finmarken. 

 Very like A. lepidoptera Greg, but this species has, when 

 dry, a brown colovir and strice twice as dense. 

 Pl. m, fig. 15 a S.A\ b F.V. 



93. Amphiprora (?) Nitzschioides Cl N. Sp. F. V. pan-' 

 duriform elongated, having on the margins a row of distinct 

 and large puncta. Connecting membrane with several longi- 

 tudinal lines, valves finely striate; strise parallel, visible only 

 by careful illumination and with high power. S.V. unknown. 

 Lenght 0,i44 m.m. Breadth (greatest) 0,036. Puncta 12 in 

 0,02 5 m.m. 



Spetsbergen Brandwyns Bay (rare). 

 Pl. 4, fig. 18. 



94. Amphicampa duplex (Donk) Kab {AinpMprora duplex 

 DoNK. T. M. S. VI, pag. 'ld<, Pl. III, fig. 13). Spetsbergen^ 

 Hackluyts, Kings Bay. Greenland. 



95. Amphora Proteus Gkeg (Diat. of Clyde pag. 518, Pl. 



XIII, fig. 81). A. affinis (Kg) Sm Syn. I, pag. 19, Pl. II, 



fig. 27). Very common in the arctic sea. Spetsbergen ex. gr. 



Hackluyts, Brandwyns Bay. Greenland. 

 i 



96. Amphora granulata Greg (Diat. of Clyde pag. 525, 



Pl. XIV, fig 96). Spetsbei^gen Hinlopen Strait. Finmarken 

 Grötsund. 



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