96 p. T. CLEVE, SYNOPSIS OF THE NAVIOUEOID DIATOMS. - 



Var. asymmetrica Cl. (1883). — V. linear, with subcuneate ends. L. (),o8; B. (),oi8 mm. 

 Axial area narrow, unilateral. Strite 8 in 0,(ji mm. — Nav. Finn. var. asym. Cl. Vega p. 463. 



Marine: Cape Wankarema! 



Var. subproducta (tRUN. (1880). — V. linear, with somewhat rostrate ends. B. 0,oi mm. 

 Stride 12 in 0,oi mm. — Nar. Pimi. var. suJip. Grun. A. D. p., 28. 



Brackish water: Baltic (Gnin.). 



Var. aniphiglottis Grun. (1884). — V. linear, with protracted ends. L. 0, 115 mm. — Nav. 

 Stuxheryii var. amphigl. Grun. Franz Josefs Land D. p. 104. 



Brackish water: North Siberia (Grun.). 



B. Forms with suhelliptical to snhlanceolate valves. 



Var. Stuxheryii Cl. (1880). — V. lanceolate, with broad, rounded or subcuneate ends. L. 

 0,059 to 0,1; B. 0,010 to 0,ui7 mm. Striae 10 to 12 in 0,01 mm. (finely punctate according to 

 Grunow). — Nav. Stuxheryii Cl. A. D. p. 13 PI. I f. 15. 



Marine: Sea of Kara! Cape Wankarema! 



Var. leptostauron Grun. (1884). — V. elliptic-linear. L. 0,o4 to 0,057; B. 0,012 to 0,oi3 

 mm. Central fascia with three indistinct strict. Striffi 11 in 0,01 mm. — Nav. Stuxheryii var. 

 leptost. Grun. F. Jos. Land D. p. 103 PI. 1 f. 32. 



Marine: Franz Josefs Land (Grun.). 



Var. suhcontinua Grun. (1884). — V. elliptic. L. 0,o4; B. 0,oi4 mm. Central fascia with 

 one or two indistinct strife. — Nav. Stuxheryii var. suhc. Grun. Fr. Jos. Land D. p. 103 PI. I f. 33. 



Marine: Franz Josefs Land (Grun.). 



Var. Theelii Cl. (1880). — V. lanceolate, with rostrate, obtuse ends. L. 0,055; B. 0,017 mm. 

 Striai .slightly radiate, 10 to 12 in 0,oi mm. — Nav. Theelii Cl. A. D. p. 13 PI. I f. 22. 



Marine: Kara! Cape DeschnefF. 



C. Forms constricted in the middle. 



Var. flnminensis Grun. (18()0). — V. linear, slightly constricted in the middle, with broad, 

 rounded extremities. L. O,o4 7; B. 0,0()8 mm. Striae 11 in 0,oi mm. — Nav. fluminensis Grun. 

 Verb. 1860 p. 520 PL III f. 7. A. D. p. 28. 



Marine: Kara! Adria (Grun.), Ceylon! Seychelles! 



Var. keryuelensis Grun. (1880). — V. linear, constricted in the middle. L. 0,057; B, 0,009 

 (middle) to 0,012 (end) mm. Strite 8,5 to 10 in 0,oi mm. — Nav. fluminensis var. kery. Grun. 

 A, D. p. 28. 



Marine: Kerguelens Land! 



Var. minor Grun. (1880). — L. 0,032; B. 0,oo5 (middle) to 0,oo6 (end) mm. Strise 15 in 

 0,01 mm. — Nav. flumin. var. minor Grun. A. D. p. 28 PI. I f. 12. 



Marine: Finmark! 



Var. Locsyi Pant. (1889). — V. linear, slightly constricted in the middle, with cuneate ends. 

 L. 0,08 1 ; B. 0,007 (middle) to 0,0145 (ends) mm. Striae 17,5 in 0,oi mm. Nav. Locsyi Pant. II 

 p. 50 PI. VI f. 114. 



Marine: Bremia Dept. Hungary (Pantoczek). 



I have not seen original specimens and am therefore uncertain whether this form really 

 belongs to P. quadratarca or whether it is a Caloneis. 



73. P. Claviculus Greg. (1857). — V. linear, with two constrictions, dividing the valve 

 into three segments, of which the median one is the smallest. L. 0,o;^8 to 0,o48; B. in the middle 

 0,006, at the ends 0,oo7 mm. Median line with approximate central pores and distant terminal 

 pores. Axial area indistinct; central area a broad, transverse fascia. Striae parallel, 12 to 13 in 



