96 v. T. CLEVE, SYNOPSIS OF THE NAVICULOID DIATOMS. 



Var. asymmttrica Cl. (1883). — V. linear, with subcuneate ends. L. O, os; B. 0,oi8 mm. 

 Axial area narrow, unilateral. Strite 8 in 0,oi mm. — Nav. Finn. var. asynt. Cl. Vega p. 463. 



Marine: Cape Wankarema! 



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

 Striee 12 in 0,oi mm. — Nav. Pinn. var. suhp. GtRUN. A. D. p. 28. 



Brackish water: Baltic (Grun.). 



Var. amjihiglottis Grdn. (1884). — V. linear, with protracted ends. L. 0,ii5 mm. — Nav. 

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



Brackish water: North Siberia (Grun.). 



B. Forms with subelliptkal to sublanceolate valves. 



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

 0,05 9 to 0,1 ; B. 0,0 16 to 0,oi7 mm. Striee 10 to 12 in 0,oi mm. (iinely punctate according to 

 Grunow). — Nav. Stuxhergii Cl. A. D. p. 13 Pl. I f. 15. 



Marine: Sea of Kära! Cape Wankarema! 



Var. leptostauron Grun. (1884). — V. elliptic-linear. L. 0,04 to 0, 057; B. 0,oi2 to 0,oi3 

 mm. Central fascia with three indistinct strise. Strii£ 11 in 0,oi mm. — Nav. Stuxhergii var. 

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



Marine: Franz Josefs Land (Grun.). 



Var. suhcontinua Grun. (1884). — V. elliptic. L. 0,04; B. 0,014 mm. Central fascia with 

 one or two indistinct strise. — Nav. Stuxhergii var. subc. Grun. Fr. Jos. Land D. p. 103 Pl. I f. 33. 



Marine: Franz Josefs Land (Grun.). 



Var. Theelii Cl. (1880). — V. lanceolate, with rostrate, obtuse ends. L. 0,055; B. 0,oi7 mm. 

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



Marine: Kära! Cape Deschneff. 



C. Forms constricted in the midäle. 



Var. fluminensis Grun. (1860). — V. linear, slightly constricted in the middle, with broad, 

 rounded extremities. L. 0,047; B. 0,oo8 mm. Striye 11 in 0, 01 mm. — Nav. fluminensis Grun. 

 Verh. 1860 p. 520 Pl. III f. 7. A. D. p. 28. 



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



Var. herguelensis Grun. (1880). — V. linear, constricted in the middle. L. 0,057; B. 0,oo9 

 (middle) to 0,oi2 (end) mm. Striee 8,5 to 10 in 0,oi mm. — Nav. fluminensis var. kerg. Grun. 

 A. D. p. 28. 



Marine: Kerguelens Land! 



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

 0,01 mm. — Nav. fl.umin. var. minor Grun. A. D. p. 28 Pl. I f. 12. 



Marine: Finmark! 



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

 L. 0,081 ; B. 0,007 (middle) to 0, 0145 (ends) mm. Striie 17,5 in 0, 01 mm. - Nav. Löczyi Pant. II 

 p. 50 Pl. VI f. 114. 



Marine: Bremia Dept. Hungary (Pantoczek). 



I have not seen oi'iginal specimens and am therefore uncertain whether this form really 

 belongs to P. (juadrutarea or wlietlier it is a Ctilonris. 



73. P. Oliiviculus Gre(}. (1857). — V. linear, with two constrictions, dividing the valve 

 into tliree segments, of which the median one is tlie smallest. L. O, oss to 0,o4s; B. in the middle 

 0,006, at the ends 0,007 mm. Median line witli ap])roximate central pores and distaut tei'niinal 

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



