KONfir,. SV. VET. AKADEMIRNS HANDLINGAU. BAND 26. N:() 2. 10.') 



Scoliopleura Guun. (ISGO). 



Valve elongated, convex. Median line sigmoid. Central nodule small. Median line enclo-sed 

 between two approximate longitiidinal lines or ridges. Strncture, tine puncta disposed in transverse 

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



The genus Scoliopleura was founded 18(50 by Grunoav (Verh. p. 554) for Navioulu' with 

 sigmoid median line, such as Nav. Jenncri and Nav. convexa W. Sm. (B. D.), 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 without longitudinal ridges along the median line. Sc. convexa {ov 

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

 the genus Scoliotrojiis. With regard to the affinities, Scolioplnira, as defined above, appears to be 

 distantly allied to Caloneis, and to Diploncis. 



1. S. Sclmeideri Grun. (1878). — V. elliptic-lanceolate, subacute. L. O.14; B. 0,04 mm. 

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

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

 longitudinal, undulating rows, 14 (13 according to Grun.) in 0,01 mm. — Nav. Schn. Grun. Ca.sp. 

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



Brackish water: Caspian Seal 



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

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



2. S. Peisonis Grux. (1860). — V. narrow, elliptical, with rounded ends. L. 0,o3.t to0,08; 

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

 distinctly punctate; puncta forming regular, longitudinal strife, 18 in 0,oi mm. — Grun. Verh. 

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



Brackish water: Neusiedler See, Himgary (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. 0,15; B. 0,o3 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 strife 17, longitudinal 25 in 

 0,01 mm. — PL I f. 9. 



Marine: Java! 



Naviculse Fusiformes Cl. 



Valve narrow, 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 NavicuJa' cufoJcice, which also has approximate central pores. (3n the other hand this 

 group is also allied to the Section Nrwindcr orfhosfichce. 



Artificial hey. 



^ ( Valve attenuated towards the ends, narrow lanceolate 2. 



1 — linear, with broad ends 5. 



K. Sv, Vet, Akiul. Handl. Band 2G. N;o 2. 14 



