KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 26. N:0 2. 105 



Scoliopleura Grun. (18G0). 



Val ve elongated, convex. Median line sigmoid. Central nodule small. Median line enclosed 

 between two approximate longitndinal lines or ridges. Structure, fine puncta disposed in transverse 

 and longitndinal rows. Connecting zone simple or withont longitndinal divisions. 



The genus Scoliopleura was founded 1860 by Grunow (Verli. p. 554) for Naviculfe with 

 sigmoid median line, such as Nav. Jennrri and Nav. convexa W. Sm. (B. C), with the bent of the 

 lines of both valves in contrary directions. The genus comprises very different forms, so that I 

 have separated from it forms witlioiit longitndinal ridges along the median line. Se. convexa (or 

 latestriata) differs from the other species by its structi^re, for wliich reason I have formed for it 

 the genus Scolioiropis. "With regard to the affinities, Scoliopleura, as defined above, appears to be 

 distantly allied to Caloneis, and to Diploneis. 



1. S. Schneideri Grun. (1878). — V. elliptic-laneeolate, .subacute. L. 0,i4; B. 0,o4 mm. 

 Median line slightlj^ sigmoid. Median pores in opposite directions. Terminal nodules small. 

 Transverse strife 18 (14 according to Grun.) in 0,oi mm. oblique, distinctly punctate, puncta forming 

 longitndinal, undulating rows, 14 (13 according to Grun.) in 0,oi mm. — Nav. Schn. Grun. Casp. 

 Sea Alg. p. 16 Pl. III f. 1. 



Brackish water: Caspian Sea! 



This is a very remarkable form. Tlie median transverse strite form oblique lines arross the 

 valve, as in some forms of Neidium; at the ends they are almost parallel. 



2. S. Peisonis Grun. (1860). — V. narrow, elliptical, with rounded ends. L. 0,035 to0,08; 

 B. 0,01 to 0,0 18 mm. Median line strongly sigmoid. StricE 14 to 16 in 0,oi mm., transverse, 

 distinctly punctate; puncta forming regnlar, longitndinal striae, 18 in 0,oi mm. — Grun. Verh. 

 1860 p. 554 Pl. V f. 25. — Icon. N. Pl. I f. 14. 



Brackish water: Neusiedler See, Hungary (Grun.), Salt Lake, Utah! 



3. S. elegans Cl. N. Sp. — V. slightlj^ sigmoid, lanceolate, gradually tapering from the 

 middle to the somewhat obtiise ends. L. 0,i5; B. 0,0 3 mm. Median line sigmoid at the ends; its 

 central pores approximate; its terminal fissures in contrary directions. Longitndinal lines closely 

 approximate to the median line. Central area indistinct. Transverse striie 17, longitndinal 25 in 

 0,01 mm. — Pl. I f. 9. 



Marine: Java! 



Naviculse Fusiformes Cl. 



Valve narrow, linear to lanceolate, usually thin or slightly silieious. Median line with 

 closely approximate central pores. Axial and central areas indistinct. Stria^ parallel, nsnally 

 fine, not crossed by longitndinal lines, finely punctate; puncta usually arranged in longitndinal, 

 straight rows. 



This small group oomprises both marine and brackish forms, akin to N. inornata of the 

 Section Navieula' eufoleice, which also has approximate central pores. On the other hand this 

 group is also allied to the Section Navieula; orihoftiich(e. 



Ärtificial Itey. 



.. f Valve attenuated towards the ends, narrow lanceolate 2. 



I — linear, with broad ends '. 5. 



K. S?. Vet. Akad. Handl. Band 26. N:o 2. 14 



