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



Scoliopleura Grun. (i860). 



Valve elongated, convex. Median line sigmoid. Central nodule small. Median line enclosed 

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

 and longitudinal rows. Connecting zone simple or without longitudinal divisions. 



The genus Scoliopleura was founded 1860 by Grunow (Verh. p. 554) for Naviculse with 

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

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

 have separated from it forms without longitudinal ridges along the median line. Sc. convexa (or 

 latestriata) differs from the other species by its structure, for which reason I have formed for it 

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

 distantly allied to Caloneis, and to Diploneis. 



1. S. Schiieideri G-run. (1878). — V. elliptic-lanceolate, subacute. L. O.m; B. 0,o4 mm. 

 Median line slightly sigmoid. Median pores in opposite directions. Terminal nodules small. 

 Transverse striae 18 (14 according to Grun.) in 0,o i mm. oblique, distinctly punctate, puncta forming 

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

 Sea Alg. p. 16 PI. Ill f. 1. 



Brackish water: Caspian Sea! 

 > / This is a very remarkable form. The median transverse striae form oblique lines across the 

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



2. S. Peisonis Grun. (I860). — V. narrow, elliptical, with rounded ends. L. 0,035 to 0,o8; 

 B. (),oi to 0,018 mm. Median line strongly sigmoid. Striae 14 to 16 in 0,oi mm., transverse, 

 distinctly punctate; puncta forming regular, longitudinal 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, slightly sigmoid, lanceolate, gradually tapering from the 

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

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

 approximate to the median line. Central area indistinct. Transverse striae 17, longitudinal 25 in 

 0,01 mm. — PI. I f. 9. 



Marine: Java! 



Naviculse Fusiformes Cl. 



' Valve ttarroW, linear to lanceolate, usually thin or slightly silicious. Median line with 

 closely approximate central pores. Axial and central areas indistinct. Strife parallel, usually 

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

 straight rows. 



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

 Section Naviculce enfoleice, which also has approximate central pores. On the other hand this 

 group is also allied to the Section Navicnlee orthostichce. 



Artificial hey. 



j Valve attenuated towards the ends, narrow lanceolate 2. 



\ — linear, with broad ends i. . . 5. 



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



